LCOV - differential code coverage report
Current view: top level - src/backend/executor - execParallel.c (source / functions) Coverage Total Hit UNC LBC UIC UBC GBC GIC GNC CBC DCB
Current: bed3ffbf9d952be6c7d739d068cdce44c046dfb7 vs 574581b50ac9c63dd9e4abebb731a3b67e5b50f6 Lines: 83.3 % 659 549 7 24 79 50 499 12
Current Date: 2026-05-05 10:23:31 +0900 Functions: 95.0 % 20 19 1 7 12
Baseline: lcov-20260505-025707-baseline Branches: 68.6 % 283 194 5 13 1 70 6 5 15 168
Baseline Date: 2026-05-05 10:27:06 +0900 Line coverage date bins:
Legend: Lines:     hit not hit
Branches: + taken - not taken # not executed
(7,30] days: 91.9 % 37 34 3 34
(30,360] days: 81.0 % 21 17 4 16 1
(360..) days: 82.9 % 601 498 24 79 498
Function coverage date bins:
(360..) days: 95.0 % 20 19 1 7 12
Branch coverage date bins:
(7,30] days: 100.0 % 12 12 12
(30,360] days: 37.5 % 8 3 5 3
(360..) days: 68.1 % 263 179 13 1 70 6 5 168

 Age         Owner                    Branch data    TLA  Line data    Source code
                                  1                 :                : /*-------------------------------------------------------------------------
                                  2                 :                :  *
                                  3                 :                :  * execParallel.c
                                  4                 :                :  *    Support routines for parallel execution.
                                  5                 :                :  *
                                  6                 :                :  * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
                                  7                 :                :  * Portions Copyright (c) 1994, Regents of the University of California
                                  8                 :                :  *
                                  9                 :                :  * This file contains routines that are intended to support setting up,
                                 10                 :                :  * using, and tearing down a ParallelContext from within the PostgreSQL
                                 11                 :                :  * executor.  The ParallelContext machinery will handle starting the
                                 12                 :                :  * workers and ensuring that their state generally matches that of the
                                 13                 :                :  * leader; see src/backend/access/transam/README.parallel for details.
                                 14                 :                :  * However, we must save and restore relevant executor state, such as
                                 15                 :                :  * any ParamListInfo associated with the query, buffer/WAL usage info, and
                                 16                 :                :  * the actual plan to be passed down to the worker.
                                 17                 :                :  *
                                 18                 :                :  * IDENTIFICATION
                                 19                 :                :  *    src/backend/executor/execParallel.c
                                 20                 :                :  *
                                 21                 :                :  *-------------------------------------------------------------------------
                                 22                 :                :  */
                                 23                 :                : 
                                 24                 :                : #include "postgres.h"
                                 25                 :                : 
                                 26                 :                : #include "executor/execParallel.h"
                                 27                 :                : #include "executor/executor.h"
                                 28                 :                : #include "executor/nodeAgg.h"
                                 29                 :                : #include "executor/nodeAppend.h"
                                 30                 :                : #include "executor/nodeBitmapHeapscan.h"
                                 31                 :                : #include "executor/nodeBitmapIndexscan.h"
                                 32                 :                : #include "executor/nodeCustom.h"
                                 33                 :                : #include "executor/nodeForeignscan.h"
                                 34                 :                : #include "executor/nodeHash.h"
                                 35                 :                : #include "executor/nodeHashjoin.h"
                                 36                 :                : #include "executor/nodeIncrementalSort.h"
                                 37                 :                : #include "executor/nodeIndexonlyscan.h"
                                 38                 :                : #include "executor/nodeIndexscan.h"
                                 39                 :                : #include "executor/nodeMemoize.h"
                                 40                 :                : #include "executor/nodeSeqscan.h"
                                 41                 :                : #include "executor/nodeSort.h"
                                 42                 :                : #include "executor/nodeSubplan.h"
                                 43                 :                : #include "executor/nodeTidrangescan.h"
                                 44                 :                : #include "executor/tqueue.h"
                                 45                 :                : #include "jit/jit.h"
                                 46                 :                : #include "nodes/nodeFuncs.h"
                                 47                 :                : #include "pgstat.h"
                                 48                 :                : #include "storage/proc.h"
                                 49                 :                : #include "tcop/tcopprot.h"
                                 50                 :                : #include "utils/datum.h"
                                 51                 :                : #include "utils/dsa.h"
                                 52                 :                : #include "utils/lsyscache.h"
                                 53                 :                : #include "utils/snapmgr.h"
                                 54                 :                : 
                                 55                 :                : /*
                                 56                 :                :  * Magic numbers for parallel executor communication.  We use constants
                                 57                 :                :  * greater than any 32-bit integer here so that values < 2^32 can be used
                                 58                 :                :  * by individual parallel nodes to store their own state.
                                 59                 :                :  */
                                 60                 :                : #define PARALLEL_KEY_EXECUTOR_FIXED     UINT64CONST(0xE000000000000001)
                                 61                 :                : #define PARALLEL_KEY_PLANNEDSTMT        UINT64CONST(0xE000000000000002)
                                 62                 :                : #define PARALLEL_KEY_PARAMLISTINFO      UINT64CONST(0xE000000000000003)
                                 63                 :                : #define PARALLEL_KEY_BUFFER_USAGE       UINT64CONST(0xE000000000000004)
                                 64                 :                : #define PARALLEL_KEY_TUPLE_QUEUE        UINT64CONST(0xE000000000000005)
                                 65                 :                : #define PARALLEL_KEY_INSTRUMENTATION    UINT64CONST(0xE000000000000006)
                                 66                 :                : #define PARALLEL_KEY_DSA                UINT64CONST(0xE000000000000007)
                                 67                 :                : #define PARALLEL_KEY_QUERY_TEXT     UINT64CONST(0xE000000000000008)
                                 68                 :                : #define PARALLEL_KEY_JIT_INSTRUMENTATION UINT64CONST(0xE000000000000009)
                                 69                 :                : #define PARALLEL_KEY_WAL_USAGE          UINT64CONST(0xE00000000000000A)
                                 70                 :                : 
                                 71                 :                : #define PARALLEL_TUPLE_QUEUE_SIZE       65536
                                 72                 :                : 
                                 73                 :                : /*
                                 74                 :                :  * Fixed-size random stuff that we need to pass to parallel workers.
                                 75                 :                :  */
                                 76                 :                : typedef struct FixedParallelExecutorState
                                 77                 :                : {
                                 78                 :                :     int64       tuples_needed;  /* tuple bound, see ExecSetTupleBound */
                                 79                 :                :     dsa_pointer param_exec;
                                 80                 :                :     int         eflags;
                                 81                 :                :     int         jit_flags;
                                 82                 :                : } FixedParallelExecutorState;
                                 83                 :                : 
                                 84                 :                : /*
                                 85                 :                :  * DSM structure for accumulating per-PlanState instrumentation.
                                 86                 :                :  *
                                 87                 :                :  * instrument_options: Same meaning here as in instrument.c.
                                 88                 :                :  *
                                 89                 :                :  * instrument_offset: Offset, relative to the start of this structure,
                                 90                 :                :  * of the first NodeInstrumentation object.  This will depend on the length of
                                 91                 :                :  * the plan_node_id array.
                                 92                 :                :  *
                                 93                 :                :  * num_workers: Number of workers.
                                 94                 :                :  *
                                 95                 :                :  * num_plan_nodes: Number of plan nodes.
                                 96                 :                :  *
                                 97                 :                :  * plan_node_id: Array of plan nodes for which we are gathering instrumentation
                                 98                 :                :  * from parallel workers.  The length of this array is given by num_plan_nodes.
                                 99                 :                :  */
                                100                 :                : struct SharedExecutorInstrumentation
                                101                 :                : {
                                102                 :                :     int         instrument_options;
                                103                 :                :     int         instrument_offset;
                                104                 :                :     int         num_workers;
                                105                 :                :     int         num_plan_nodes;
                                106                 :                :     int         plan_node_id[FLEXIBLE_ARRAY_MEMBER];
                                107                 :                : 
                                108                 :                :     /*
                                109                 :                :      * Array of num_plan_nodes * num_workers NodeInstrumentation objects
                                110                 :                :      * follows.
                                111                 :                :      */
                                112                 :                : };
                                113                 :                : #define GetInstrumentationArray(sei) \
                                114                 :                :     (StaticAssertVariableIsOfTypeMacro(sei, SharedExecutorInstrumentation *), \
                                115                 :                :      (NodeInstrumentation *) (((char *) sei) + sei->instrument_offset))
                                116                 :                : 
                                117                 :                : /* Context object for ExecParallelEstimate. */
                                118                 :                : typedef struct ExecParallelEstimateContext
                                119                 :                : {
                                120                 :                :     ParallelContext *pcxt;
                                121                 :                :     int         nnodes;
                                122                 :                : } ExecParallelEstimateContext;
                                123                 :                : 
                                124                 :                : /* Context object for ExecParallelInitializeDSM. */
                                125                 :                : typedef struct ExecParallelInitializeDSMContext
                                126                 :                : {
                                127                 :                :     ParallelContext *pcxt;
                                128                 :                :     SharedExecutorInstrumentation *instrumentation;
                                129                 :                :     int         nnodes;
                                130                 :                : } ExecParallelInitializeDSMContext;
                                131                 :                : 
                                132                 :                : /* Helper functions that run in the parallel leader. */
                                133                 :                : static char *ExecSerializePlan(Plan *plan, EState *estate);
                                134                 :                : static bool ExecParallelEstimate(PlanState *planstate,
                                135                 :                :                                  ExecParallelEstimateContext *e);
                                136                 :                : static bool ExecParallelInitializeDSM(PlanState *planstate,
                                137                 :                :                                       ExecParallelInitializeDSMContext *d);
                                138                 :                : static shm_mq_handle **ExecParallelSetupTupleQueues(ParallelContext *pcxt,
                                139                 :                :                                                     bool reinitialize);
                                140                 :                : static bool ExecParallelReInitializeDSM(PlanState *planstate,
                                141                 :                :                                         ParallelContext *pcxt);
                                142                 :                : static bool ExecParallelRetrieveInstrumentation(PlanState *planstate,
                                143                 :                :                                                 SharedExecutorInstrumentation *instrumentation);
                                144                 :                : 
                                145                 :                : /* Helper function that runs in the parallel worker. */
                                146                 :                : static DestReceiver *ExecParallelGetReceiver(dsm_segment *seg, shm_toc *toc);
                                147                 :                : 
                                148                 :                : /*
                                149                 :                :  * Create a serialized representation of the plan to be sent to each worker.
                                150                 :                :  */
                                151                 :                : static char *
 3870 rhaas@postgresql.org      152                 :CBC         524 : ExecSerializePlan(Plan *plan, EState *estate)
                                153                 :                : {
                                154                 :                :     PlannedStmt *pstmt;
                                155                 :                :     ListCell   *lc;
                                156                 :                : 
                                157                 :                :     /* We can't scribble on the original plan, so make a copy. */
 3872                           158                 :            524 :     plan = copyObject(plan);
                                159                 :                : 
                                160                 :                :     /*
                                161                 :                :      * The worker will start its own copy of the executor, and that copy will
                                162                 :                :      * insert a junk filter if the toplevel node has any resjunk entries. We
                                163                 :                :      * don't want that to happen, because while resjunk columns shouldn't be
                                164                 :                :      * sent back to the user, here the tuples are coming back to another
                                165                 :                :      * backend which may very well need them.  So mutate the target list
                                166                 :                :      * accordingly.  This is sort of a hack; there might be better ways to do
                                167                 :                :      * this...
                                168                 :                :      */
 3310 tgl@sss.pgh.pa.us         169   [ +  +  +  +  :           1437 :     foreach(lc, plan->targetlist)
                                              +  + ]
                                170                 :                :     {
                                171                 :            913 :         TargetEntry *tle = lfirst_node(TargetEntry, lc);
                                172                 :                : 
 3872 rhaas@postgresql.org      173                 :            913 :         tle->resjunk = false;
                                174                 :                :     }
                                175                 :                : 
                                176                 :                :     /*
                                177                 :                :      * Create a dummy PlannedStmt.  Most of the fields don't need to be valid
                                178                 :                :      * for our purposes, but the worker will need at least a minimal
                                179                 :                :      * PlannedStmt to start the executor.
                                180                 :                :      */
                                181                 :            524 :     pstmt = makeNode(PlannedStmt);
                                182                 :            524 :     pstmt->commandType = CMD_SELECT;
 1841 bruce@momjian.us          183                 :            524 :     pstmt->queryId = pgstat_get_my_query_id();
  407 michael@paquier.xyz       184                 :            524 :     pstmt->planId = pgstat_get_my_plan_id();
 3581 tgl@sss.pgh.pa.us         185                 :            524 :     pstmt->hasReturning = false;
                                186                 :            524 :     pstmt->hasModifyingCTE = false;
                                187                 :            524 :     pstmt->canSetTag = true;
                                188                 :            524 :     pstmt->transientPlan = false;
                                189                 :            524 :     pstmt->dependsOnRole = false;
                                190                 :            524 :     pstmt->parallelModeNeeded = false;
 3872 rhaas@postgresql.org      191                 :            524 :     pstmt->planTree = plan;
  460 amitlan@postgresql.o      192                 :            524 :     pstmt->partPruneInfos = estate->es_part_prune_infos;
 3870 rhaas@postgresql.org      193                 :            524 :     pstmt->rtable = estate->es_range_table;
  452 amitlan@postgresql.o      194                 :            524 :     pstmt->unprunableRelids = estate->es_unpruned_relids;
 1246 alvherre@alvh.no-ip.      195                 :            524 :     pstmt->permInfos = estate->es_rteperminfos;
 2337 tgl@sss.pgh.pa.us         196                 :            524 :     pstmt->appendRelations = NIL;
  278 michael@paquier.xyz       197                 :GNC         524 :     pstmt->planOrigin = PLAN_STMT_INTERNAL;
                                198                 :                : 
                                199                 :                :     /*
                                200                 :                :      * Transfer only parallel-safe subplans, leaving a NULL "hole" in the list
                                201                 :                :      * for unsafe ones (so that the list indexes of the safe ones are
                                202                 :                :      * preserved).  This positively ensures that the worker won't try to run,
                                203                 :                :      * or even do ExecInitNode on, an unsafe subplan.  That's important to
                                204                 :                :      * protect, eg, non-parallel-aware FDWs from getting into trouble.
                                205                 :                :      */
 3310 tgl@sss.pgh.pa.us         206                 :CBC         524 :     pstmt->subplans = NIL;
                                207   [ +  +  +  +  :            560 :     foreach(lc, estate->es_plannedstmt->subplans)
                                              +  + ]
                                208                 :                :     {
                                209                 :             36 :         Plan       *subplan = (Plan *) lfirst(lc);
                                210                 :                : 
                                211   [ +  -  +  + ]:             36 :         if (subplan && !subplan->parallel_safe)
                                212                 :              8 :             subplan = NULL;
                                213                 :             36 :         pstmt->subplans = lappend(pstmt->subplans, subplan);
                                214                 :                :     }
                                215                 :                : 
 3872 rhaas@postgresql.org      216                 :            524 :     pstmt->rewindPlanIDs = NULL;
                                217                 :            524 :     pstmt->rowMarks = NIL;
                                218                 :                : 
                                219                 :                :     /*
                                220                 :                :      * Pass the row mark and result relation relids to parallel workers. They
                                221                 :                :      * may need to check them to inform heuristics.
                                222                 :                :      */
   36 melanieplageman@gmai      223                 :GNC         524 :     pstmt->rowMarkRelids = estate->es_plannedstmt->rowMarkRelids;
                                224                 :            524 :     pstmt->resultRelationRelids = estate->es_plannedstmt->resultRelationRelids;
 3872 rhaas@postgresql.org      225                 :CBC         524 :     pstmt->relationOids = NIL;
                                226                 :            524 :     pstmt->invalItems = NIL; /* workers can't replan anyway... */
 3095                           227                 :            524 :     pstmt->paramExecTypes = estate->es_plannedstmt->paramExecTypes;
 3398 tgl@sss.pgh.pa.us         228                 :            524 :     pstmt->utilityStmt = NULL;
                                229                 :            524 :     pstmt->stmt_location = -1;
                                230                 :            524 :     pstmt->stmt_len = -1;
                                231                 :                : 
                                232                 :                :     /* Return serialized copy of our dummy PlannedStmt. */
 3872 rhaas@postgresql.org      233                 :            524 :     return nodeToString(pstmt);
                                234                 :                : }
                                235                 :                : 
                                236                 :                : /*
                                237                 :                :  * Parallel-aware plan nodes (and occasionally others) may need some state
                                238                 :                :  * which is shared across all parallel workers.  Before we size the DSM, give
                                239                 :                :  * them a chance to call shm_toc_estimate_chunk or shm_toc_estimate_keys on
                                240                 :                :  * &pcxt->estimator.
                                241                 :                :  *
                                242                 :                :  * While we're at it, count the number of PlanState nodes in the tree, so
                                243                 :                :  * we know how many Instrumentation structures we need.
                                244                 :                :  */
                                245                 :                : static bool
                                246                 :           3297 : ExecParallelEstimate(PlanState *planstate, ExecParallelEstimateContext *e)
                                247                 :                : {
                                248         [ -  + ]:           3297 :     if (planstate == NULL)
 3872 rhaas@postgresql.org      249                 :UBC           0 :         return false;
                                250                 :                : 
                                251                 :                :     /* Count this node. */
 3872 rhaas@postgresql.org      252                 :CBC        3297 :     e->nnodes++;
                                253                 :                : 
 3171                           254   [ +  +  +  +  :           3297 :     switch (nodeTag(planstate))
                                     -  +  +  -  +  
                                     +  +  +  -  +  
                                              +  + ]
                                255                 :                :     {
                                256                 :           1529 :         case T_SeqScanState:
                                257         [ +  + ]:           1529 :             if (planstate->plan->parallel_aware)
 3758                           258                 :           1191 :                 ExecSeqScanEstimate((SeqScanState *) planstate,
                                259                 :                :                                     e->pcxt);
                                260                 :                :             /* even when not parallel-aware, for EXPLAIN ANALYZE */
   28 tomas.vondra@postgre      261                 :GNC        1529 :             ExecSeqScanInstrumentEstimate((SeqScanState *) planstate,
                                262                 :                :                                           e->pcxt);
 3171 rhaas@postgresql.org      263                 :CBC        1529 :             break;
                                264                 :            276 :         case T_IndexScanState:
   29 melanieplageman@gmai      265         [ +  + ]:GNC         276 :             if (planstate->plan->parallel_aware)
                                266                 :             12 :                 ExecIndexScanEstimate((IndexScanState *) planstate,
                                267                 :                :                                       e->pcxt);
                                268                 :                :             /* even when not parallel-aware, for EXPLAIN ANALYZE */
                                269                 :            276 :             ExecIndexScanInstrumentEstimate((IndexScanState *) planstate,
                                270                 :                :                                             e->pcxt);
 3171 rhaas@postgresql.org      271                 :CBC         276 :             break;
                                272                 :             42 :         case T_IndexOnlyScanState:
   29 melanieplageman@gmai      273         [ +  + ]:GNC          42 :             if (planstate->plan->parallel_aware)
                                274                 :             30 :                 ExecIndexOnlyScanEstimate((IndexOnlyScanState *) planstate,
                                275                 :                :                                           e->pcxt);
                                276                 :                :             /* even when not parallel-aware, for EXPLAIN ANALYZE */
                                277                 :             42 :             ExecIndexOnlyScanInstrumentEstimate((IndexOnlyScanState *) planstate,
                                278                 :                :                                                 e->pcxt);
  420 pg@bowt.ie                279                 :CBC          42 :             break;
                                280                 :             13 :         case T_BitmapIndexScanState:
                                281                 :                :             /* even when not parallel-aware, for EXPLAIN ANALYZE */
                                282                 :             13 :             ExecBitmapIndexScanEstimate((BitmapIndexScanState *) planstate,
                                283                 :                :                                         e->pcxt);
 3171 rhaas@postgresql.org      284                 :             13 :             break;
 3171 rhaas@postgresql.org      285                 :UBC           0 :         case T_ForeignScanState:
                                286         [ #  # ]:              0 :             if (planstate->plan->parallel_aware)
 3744                           287                 :              0 :                 ExecForeignScanEstimate((ForeignScanState *) planstate,
                                288                 :                :                                         e->pcxt);
 3171                           289                 :              0 :             break;
  159 drowley@postgresql.o      290                 :GNC          16 :         case T_TidRangeScanState:
                                291         [ +  - ]:             16 :             if (planstate->plan->parallel_aware)
                                292                 :             16 :                 ExecTidRangeScanEstimate((TidRangeScanState *) planstate,
                                293                 :                :                                          e->pcxt);
                                294                 :                :             /* even when not parallel-aware, for EXPLAIN ANALYZE */
   28 tomas.vondra@postgre      295                 :             16 :             ExecTidRangeScanInstrumentEstimate((TidRangeScanState *) planstate,
                                296                 :                :                                                e->pcxt);
  159 drowley@postgresql.o      297                 :             16 :             break;
 3073 rhaas@postgresql.org      298                 :CBC         148 :         case T_AppendState:
                                299         [ +  + ]:            148 :             if (planstate->plan->parallel_aware)
                                300                 :            108 :                 ExecAppendEstimate((AppendState *) planstate,
                                301                 :                :                                    e->pcxt);
                                302                 :            148 :             break;
 3171 rhaas@postgresql.org      303                 :UBC           0 :         case T_CustomScanState:
                                304         [ #  # ]:              0 :             if (planstate->plan->parallel_aware)
 3744                           305                 :              0 :                 ExecCustomScanEstimate((CustomScanState *) planstate,
                                306                 :                :                                        e->pcxt);
 3171                           307                 :              0 :             break;
 3171 rhaas@postgresql.org      308                 :CBC          13 :         case T_BitmapHeapScanState:
                                309         [ +  + ]:             13 :             if (planstate->plan->parallel_aware)
 3345                           310                 :             12 :                 ExecBitmapHeapEstimate((BitmapHeapScanState *) planstate,
                                311                 :                :                                        e->pcxt);
                                312                 :                :             /* even when not parallel-aware, for EXPLAIN ANALYZE */
   28 tomas.vondra@postgre      313                 :GNC          13 :             ExecBitmapHeapInstrumentEstimate((BitmapHeapScanState *) planstate,
                                314                 :                :                                              e->pcxt);
 3171 rhaas@postgresql.org      315                 :CBC          13 :             break;
 3058 andres@anarazel.de        316                 :            208 :         case T_HashJoinState:
                                317         [ +  + ]:            208 :             if (planstate->plan->parallel_aware)
                                318                 :             84 :                 ExecHashJoinEstimate((HashJoinState *) planstate,
                                319                 :                :                                      e->pcxt);
                                320                 :            208 :             break;
 3073                           321                 :            208 :         case T_HashState:
                                322                 :                :             /* even when not parallel-aware, for EXPLAIN ANALYZE */
                                323                 :            208 :             ExecHashEstimate((HashState *) planstate, e->pcxt);
                                324                 :            208 :             break;
 3171 rhaas@postgresql.org      325                 :            197 :         case T_SortState:
                                326                 :                :             /* even when not parallel-aware, for EXPLAIN ANALYZE */
                                327                 :            197 :             ExecSortEstimate((SortState *) planstate, e->pcxt);
 3170 tgl@sss.pgh.pa.us         328                 :            197 :             break;
 2220 tomas.vondra@postgre      329                 :UBC           0 :         case T_IncrementalSortState:
                                330                 :                :             /* even when not parallel-aware, for EXPLAIN ANALYZE */
                                331                 :              0 :             ExecIncrementalSortEstimate((IncrementalSortState *) planstate, e->pcxt);
                                332                 :              0 :             break;
 2146 drowley@postgresql.o      333                 :CBC         393 :         case T_AggState:
                                334                 :                :             /* even when not parallel-aware, for EXPLAIN ANALYZE */
                                335                 :            393 :             ExecAggEstimate((AggState *) planstate, e->pcxt);
                                336                 :            393 :             break;
 1756                           337                 :              4 :         case T_MemoizeState:
                                338                 :                :             /* even when not parallel-aware, for EXPLAIN ANALYZE */
                                339                 :              4 :             ExecMemoizeEstimate((MemoizeState *) planstate, e->pcxt);
 1859                           340                 :              4 :             break;
 3171 rhaas@postgresql.org      341                 :            250 :         default:
                                342                 :            250 :             break;
                                343                 :                :     }
                                344                 :                : 
 3872                           345                 :           3297 :     return planstate_tree_walker(planstate, ExecParallelEstimate, e);
                                346                 :                : }
                                347                 :                : 
                                348                 :                : /*
                                349                 :                :  * Estimate the amount of space required to serialize the indicated parameters.
                                350                 :                :  */
                                351                 :                : static Size
 3092                           352                 :             16 : EstimateParamExecSpace(EState *estate, Bitmapset *params)
                                353                 :                : {
                                354                 :                :     int         paramid;
                                355                 :             16 :     Size        sz = sizeof(int);
                                356                 :                : 
                                357                 :             16 :     paramid = -1;
                                358         [ +  + ]:             36 :     while ((paramid = bms_next_member(params, paramid)) >= 0)
                                359                 :                :     {
                                360                 :                :         Oid         typeOid;
                                361                 :                :         int16       typLen;
                                362                 :                :         bool        typByVal;
                                363                 :                :         ParamExecData *prm;
                                364                 :                : 
                                365                 :             20 :         prm = &(estate->es_param_exec_vals[paramid]);
                                366                 :             20 :         typeOid = list_nth_oid(estate->es_plannedstmt->paramExecTypes,
                                367                 :                :                                paramid);
                                368                 :                : 
                                369                 :             20 :         sz = add_size(sz, sizeof(int)); /* space for paramid */
                                370                 :                : 
                                371                 :                :         /* space for datum/isnull */
                                372         [ +  - ]:             20 :         if (OidIsValid(typeOid))
                                373                 :             20 :             get_typlenbyval(typeOid, &typLen, &typByVal);
                                374                 :                :         else
                                375                 :                :         {
                                376                 :                :             /* If no type OID, assume by-value, like copyParamList does. */
 3092 rhaas@postgresql.org      377                 :UBC           0 :             typLen = sizeof(Datum);
                                378                 :              0 :             typByVal = true;
                                379                 :                :         }
 3092 rhaas@postgresql.org      380                 :CBC          20 :         sz = add_size(sz,
                                381                 :             20 :                       datumEstimateSpace(prm->value, prm->isnull,
                                382                 :                :                                          typByVal, typLen));
                                383                 :                :     }
                                384                 :             16 :     return sz;
                                385                 :                : }
                                386                 :                : 
                                387                 :                : /*
                                388                 :                :  * Serialize specified PARAM_EXEC parameters.
                                389                 :                :  *
                                390                 :                :  * We write the number of parameters first, as a 4-byte integer, and then
                                391                 :                :  * write details for each parameter in turn.  The details for each parameter
                                392                 :                :  * consist of a 4-byte paramid (location of param in execution time internal
                                393                 :                :  * parameter array) and then the datum as serialized by datumSerialize().
                                394                 :                :  */
                                395                 :                : static dsa_pointer
 3060                           396                 :             16 : SerializeParamExecParams(EState *estate, Bitmapset *params, dsa_area *area)
                                397                 :                : {
                                398                 :                :     Size        size;
                                399                 :                :     int         nparams;
                                400                 :                :     int         paramid;
                                401                 :                :     ParamExecData *prm;
                                402                 :                :     dsa_pointer handle;
                                403                 :                :     char       *start_address;
                                404                 :                : 
                                405                 :                :     /* Allocate enough space for the current parameter values. */
 3092                           406                 :             16 :     size = EstimateParamExecSpace(estate, params);
 3060                           407                 :             16 :     handle = dsa_allocate(area, size);
                                408                 :             16 :     start_address = dsa_get_address(area, handle);
                                409                 :                : 
                                410                 :                :     /* First write the number of parameters as a 4-byte integer. */
 3092                           411                 :             16 :     nparams = bms_num_members(params);
                                412                 :             16 :     memcpy(start_address, &nparams, sizeof(int));
                                413                 :             16 :     start_address += sizeof(int);
                                414                 :                : 
                                415                 :                :     /* Write details for each parameter in turn. */
                                416                 :             16 :     paramid = -1;
                                417         [ +  + ]:             36 :     while ((paramid = bms_next_member(params, paramid)) >= 0)
                                418                 :                :     {
                                419                 :                :         Oid         typeOid;
                                420                 :                :         int16       typLen;
                                421                 :                :         bool        typByVal;
                                422                 :                : 
                                423                 :             20 :         prm = &(estate->es_param_exec_vals[paramid]);
                                424                 :             20 :         typeOid = list_nth_oid(estate->es_plannedstmt->paramExecTypes,
                                425                 :                :                                paramid);
                                426                 :                : 
                                427                 :                :         /* Write paramid. */
                                428                 :             20 :         memcpy(start_address, &paramid, sizeof(int));
                                429                 :             20 :         start_address += sizeof(int);
                                430                 :                : 
                                431                 :                :         /* Write datum/isnull */
                                432         [ +  - ]:             20 :         if (OidIsValid(typeOid))
                                433                 :             20 :             get_typlenbyval(typeOid, &typLen, &typByVal);
                                434                 :                :         else
                                435                 :                :         {
                                436                 :                :             /* If no type OID, assume by-value, like copyParamList does. */
 3092 rhaas@postgresql.org      437                 :UBC           0 :             typLen = sizeof(Datum);
                                438                 :              0 :             typByVal = true;
                                439                 :                :         }
 3092 rhaas@postgresql.org      440                 :CBC          20 :         datumSerialize(prm->value, prm->isnull, typByVal, typLen,
                                441                 :                :                        &start_address);
                                442                 :                :     }
                                443                 :                : 
                                444                 :             16 :     return handle;
                                445                 :                : }
                                446                 :                : 
                                447                 :                : /*
                                448                 :                :  * Restore specified PARAM_EXEC parameters.
                                449                 :                :  */
                                450                 :                : static void
                                451                 :             48 : RestoreParamExecParams(char *start_address, EState *estate)
                                452                 :                : {
                                453                 :                :     int         nparams;
                                454                 :                :     int         i;
                                455                 :                :     int         paramid;
                                456                 :                : 
                                457                 :             48 :     memcpy(&nparams, start_address, sizeof(int));
                                458                 :             48 :     start_address += sizeof(int);
                                459                 :                : 
                                460         [ +  + ]:            104 :     for (i = 0; i < nparams; i++)
                                461                 :                :     {
                                462                 :                :         ParamExecData *prm;
                                463                 :                : 
                                464                 :                :         /* Read paramid */
                                465                 :             56 :         memcpy(&paramid, start_address, sizeof(int));
                                466                 :             56 :         start_address += sizeof(int);
                                467                 :             56 :         prm = &(estate->es_param_exec_vals[paramid]);
                                468                 :                : 
                                469                 :                :         /* Read datum/isnull. */
                                470                 :             56 :         prm->value = datumRestore(&start_address, &prm->isnull);
                                471                 :             56 :         prm->execPlan = NULL;
                                472                 :                :     }
                                473                 :             48 : }
                                474                 :                : 
                                475                 :                : /*
                                476                 :                :  * Initialize the dynamic shared memory segment that will be used to control
                                477                 :                :  * parallel execution.
                                478                 :                :  */
                                479                 :                : static bool
 3872                           480                 :           3297 : ExecParallelInitializeDSM(PlanState *planstate,
                                481                 :                :                           ExecParallelInitializeDSMContext *d)
                                482                 :                : {
                                483         [ -  + ]:           3297 :     if (planstate == NULL)
 3872 rhaas@postgresql.org      484                 :UBC           0 :         return false;
                                485                 :                : 
                                486                 :                :     /* If instrumentation is enabled, initialize slot for this node. */
 3872 rhaas@postgresql.org      487         [ +  + ]:CBC        3297 :     if (d->instrumentation != NULL)
 3800                           488                 :            684 :         d->instrumentation->plan_node_id[d->nnodes] =
                                489                 :            684 :             planstate->plan->plan_node_id;
                                490                 :                : 
                                491                 :                :     /* Count this node. */
 3872                           492                 :           3297 :     d->nnodes++;
                                493                 :                : 
                                494                 :                :     /*
                                495                 :                :      * Call initializers for DSM-using plan nodes.
                                496                 :                :      *
                                497                 :                :      * Most plan nodes won't do anything here, but plan nodes that allocated
                                498                 :                :      * DSM may need to initialize shared state in the DSM before parallel
                                499                 :                :      * workers are launched.  They can allocate the space they previously
                                500                 :                :      * estimated using shm_toc_allocate, and add the keys they previously
                                501                 :                :      * estimated using shm_toc_insert, in each case targeting pcxt->toc.
                                502                 :                :      */
 3171                           503   [ +  +  +  +  :           3297 :     switch (nodeTag(planstate))
                                     -  +  +  -  +  
                                     +  +  +  -  +  
                                              +  + ]
                                504                 :                :     {
                                505                 :           1529 :         case T_SeqScanState:
                                506         [ +  + ]:           1529 :             if (planstate->plan->parallel_aware)
 3758                           507                 :           1191 :                 ExecSeqScanInitializeDSM((SeqScanState *) planstate,
                                508                 :                :                                          d->pcxt);
                                509                 :                :             /* even when not parallel-aware, for EXPLAIN ANALYZE */
   28 tomas.vondra@postgre      510                 :GNC        1529 :             ExecSeqScanInstrumentInitDSM((SeqScanState *) planstate,
                                511                 :                :                                          d->pcxt);
 3171 rhaas@postgresql.org      512                 :CBC        1529 :             break;
                                513                 :            276 :         case T_IndexScanState:
   29 melanieplageman@gmai      514         [ +  + ]:GNC         276 :             if (planstate->plan->parallel_aware)
                                515                 :             12 :                 ExecIndexScanInitializeDSM((IndexScanState *) planstate,
                                516                 :                :                                            d->pcxt);
                                517                 :                :             /* even when not parallel-aware, for EXPLAIN ANALYZE */
                                518                 :            276 :             ExecIndexScanInstrumentInitDSM((IndexScanState *) planstate,
                                519                 :                :                                            d->pcxt);
 3171 rhaas@postgresql.org      520                 :CBC         276 :             break;
                                521                 :             42 :         case T_IndexOnlyScanState:
   29 melanieplageman@gmai      522         [ +  + ]:GNC          42 :             if (planstate->plan->parallel_aware)
                                523                 :             30 :                 ExecIndexOnlyScanInitializeDSM((IndexOnlyScanState *) planstate,
                                524                 :                :                                                d->pcxt);
                                525                 :                :             /* even when not parallel-aware, for EXPLAIN ANALYZE */
                                526                 :             42 :             ExecIndexOnlyScanInstrumentInitDSM((IndexOnlyScanState *) planstate,
                                527                 :                :                                                d->pcxt);
  420 pg@bowt.ie                528                 :CBC          42 :             break;
                                529                 :             13 :         case T_BitmapIndexScanState:
                                530                 :                :             /* even when not parallel-aware, for EXPLAIN ANALYZE */
                                531                 :             13 :             ExecBitmapIndexScanInitializeDSM((BitmapIndexScanState *) planstate, d->pcxt);
 3171 rhaas@postgresql.org      532                 :             13 :             break;
 3171 rhaas@postgresql.org      533                 :UBC           0 :         case T_ForeignScanState:
                                534         [ #  # ]:              0 :             if (planstate->plan->parallel_aware)
 3744                           535                 :              0 :                 ExecForeignScanInitializeDSM((ForeignScanState *) planstate,
                                536                 :                :                                              d->pcxt);
 3171                           537                 :              0 :             break;
  159 drowley@postgresql.o      538                 :GNC          16 :         case T_TidRangeScanState:
                                539         [ +  - ]:             16 :             if (planstate->plan->parallel_aware)
                                540                 :             16 :                 ExecTidRangeScanInitializeDSM((TidRangeScanState *) planstate,
                                541                 :                :                                               d->pcxt);
                                542                 :                :             /* even when not parallel-aware, for EXPLAIN ANALYZE */
   28 tomas.vondra@postgre      543                 :             16 :             ExecTidRangeScanInstrumentInitDSM((TidRangeScanState *) planstate,
                                544                 :                :                                               d->pcxt);
  159 drowley@postgresql.o      545                 :             16 :             break;
 3073 rhaas@postgresql.org      546                 :CBC         148 :         case T_AppendState:
                                547         [ +  + ]:            148 :             if (planstate->plan->parallel_aware)
                                548                 :            108 :                 ExecAppendInitializeDSM((AppendState *) planstate,
                                549                 :                :                                         d->pcxt);
                                550                 :            148 :             break;
 3171 rhaas@postgresql.org      551                 :UBC           0 :         case T_CustomScanState:
                                552         [ #  # ]:              0 :             if (planstate->plan->parallel_aware)
 3744                           553                 :              0 :                 ExecCustomScanInitializeDSM((CustomScanState *) planstate,
                                554                 :                :                                             d->pcxt);
 3171                           555                 :              0 :             break;
 3171 rhaas@postgresql.org      556                 :CBC          13 :         case T_BitmapHeapScanState:
                                557         [ +  + ]:             13 :             if (planstate->plan->parallel_aware)
 3345                           558                 :             12 :                 ExecBitmapHeapInitializeDSM((BitmapHeapScanState *) planstate,
                                559                 :                :                                             d->pcxt);
                                560                 :                :             /* even when not parallel-aware, for EXPLAIN ANALYZE */
   28 tomas.vondra@postgre      561                 :GNC          13 :             ExecBitmapHeapInstrumentInitDSM((BitmapHeapScanState *) planstate,
                                562                 :                :                                             d->pcxt);
 3171 rhaas@postgresql.org      563                 :CBC          13 :             break;
 3058 andres@anarazel.de        564                 :            208 :         case T_HashJoinState:
                                565         [ +  + ]:            208 :             if (planstate->plan->parallel_aware)
                                566                 :             84 :                 ExecHashJoinInitializeDSM((HashJoinState *) planstate,
                                567                 :                :                                           d->pcxt);
                                568                 :            208 :             break;
 3073                           569                 :            208 :         case T_HashState:
                                570                 :                :             /* even when not parallel-aware, for EXPLAIN ANALYZE */
                                571                 :            208 :             ExecHashInitializeDSM((HashState *) planstate, d->pcxt);
                                572                 :            208 :             break;
 3171 rhaas@postgresql.org      573                 :            197 :         case T_SortState:
                                574                 :                :             /* even when not parallel-aware, for EXPLAIN ANALYZE */
                                575                 :            197 :             ExecSortInitializeDSM((SortState *) planstate, d->pcxt);
 3170 tgl@sss.pgh.pa.us         576                 :            197 :             break;
 2220 tomas.vondra@postgre      577                 :UBC           0 :         case T_IncrementalSortState:
                                578                 :                :             /* even when not parallel-aware, for EXPLAIN ANALYZE */
                                579                 :              0 :             ExecIncrementalSortInitializeDSM((IncrementalSortState *) planstate, d->pcxt);
                                580                 :              0 :             break;
 2146 drowley@postgresql.o      581                 :CBC         393 :         case T_AggState:
                                582                 :                :             /* even when not parallel-aware, for EXPLAIN ANALYZE */
                                583                 :            393 :             ExecAggInitializeDSM((AggState *) planstate, d->pcxt);
                                584                 :            393 :             break;
 1756                           585                 :              4 :         case T_MemoizeState:
                                586                 :                :             /* even when not parallel-aware, for EXPLAIN ANALYZE */
                                587                 :              4 :             ExecMemoizeInitializeDSM((MemoizeState *) planstate, d->pcxt);
 1859                           588                 :              4 :             break;
 3171 rhaas@postgresql.org      589                 :            250 :         default:
                                590                 :            250 :             break;
                                591                 :                :     }
                                592                 :                : 
 3872                           593                 :           3297 :     return planstate_tree_walker(planstate, ExecParallelInitializeDSM, d);
                                594                 :                : }
                                595                 :                : 
                                596                 :                : /*
                                597                 :                :  * It sets up the response queues for backend workers to return tuples
                                598                 :                :  * to the main backend and start the workers.
                                599                 :                :  */
                                600                 :                : static shm_mq_handle **
 3840                           601                 :            696 : ExecParallelSetupTupleQueues(ParallelContext *pcxt, bool reinitialize)
                                602                 :                : {
                                603                 :                :     shm_mq_handle **responseq;
                                604                 :                :     char       *tqueuespace;
                                605                 :                :     int         i;
                                606                 :                : 
                                607                 :                :     /* Skip this if no workers. */
 3872                           608         [ -  + ]:            696 :     if (pcxt->nworkers == 0)
 3872 rhaas@postgresql.org      609                 :UBC           0 :         return NULL;
                                610                 :                : 
                                611                 :                :     /* Allocate memory for shared memory queue handles. */
                                612                 :                :     responseq = (shm_mq_handle **)
 3872 rhaas@postgresql.org      613                 :CBC         696 :         palloc(pcxt->nworkers * sizeof(shm_mq_handle *));
                                614                 :                : 
                                615                 :                :     /*
                                616                 :                :      * If not reinitializing, allocate space from the DSM for the queues;
                                617                 :                :      * otherwise, find the already allocated space.
                                618                 :                :      */
 3840                           619         [ +  + ]:            696 :     if (!reinitialize)
                                620                 :                :         tqueuespace =
                                621                 :            524 :             shm_toc_allocate(pcxt->toc,
                                622                 :                :                              mul_size(PARALLEL_TUPLE_QUEUE_SIZE,
 3651                           623                 :            524 :                                       pcxt->nworkers));
                                624                 :                :     else
 3256 tgl@sss.pgh.pa.us         625                 :            172 :         tqueuespace = shm_toc_lookup(pcxt->toc, PARALLEL_KEY_TUPLE_QUEUE, false);
                                626                 :                : 
                                627                 :                :     /* Create the queues, and become the receiver for each. */
 3872 rhaas@postgresql.org      628         [ +  + ]:           2567 :     for (i = 0; i < pcxt->nworkers; ++i)
                                629                 :                :     {
                                630                 :                :         shm_mq     *mq;
                                631                 :                : 
 3651                           632                 :           1871 :         mq = shm_mq_create(tqueuespace +
                                633                 :           1871 :                            ((Size) i) * PARALLEL_TUPLE_QUEUE_SIZE,
                                634                 :                :                            (Size) PARALLEL_TUPLE_QUEUE_SIZE);
                                635                 :                : 
 3872                           636                 :           1871 :         shm_mq_set_receiver(mq, MyProc);
                                637                 :           1871 :         responseq[i] = shm_mq_attach(mq, pcxt->seg, NULL);
                                638                 :                :     }
                                639                 :                : 
                                640                 :                :     /* Add array of queues to shm_toc, so others can find it. */
 3840                           641         [ +  + ]:            696 :     if (!reinitialize)
                                642                 :            524 :         shm_toc_insert(pcxt->toc, PARALLEL_KEY_TUPLE_QUEUE, tqueuespace);
                                643                 :                : 
                                644                 :                :     /* Return array of handles. */
 3872                           645                 :            696 :     return responseq;
                                646                 :                : }
                                647                 :                : 
                                648                 :                : /*
                                649                 :                :  * Sets up the required infrastructure for backend workers to perform
                                650                 :                :  * execution and return results to the main backend.
                                651                 :                :  */
                                652                 :                : ParallelExecutorInfo *
 3092                           653                 :            524 : ExecInitParallelPlan(PlanState *planstate, EState *estate,
                                654                 :                :                      Bitmapset *sendParams, int nworkers,
                                655                 :                :                      int64 tuples_needed)
                                656                 :                : {
                                657                 :                :     ParallelExecutorInfo *pei;
                                658                 :                :     ParallelContext *pcxt;
                                659                 :                :     ExecParallelEstimateContext e;
                                660                 :                :     ExecParallelInitializeDSMContext d;
                                661                 :                :     FixedParallelExecutorState *fpes;
                                662                 :                :     char       *pstmt_data;
                                663                 :                :     char       *pstmt_space;
                                664                 :                :     char       *paramlistinfo_space;
                                665                 :                :     BufferUsage *bufusage_space;
                                666                 :                :     WalUsage   *walusage_space;
 3872                           667                 :            524 :     SharedExecutorInstrumentation *instrumentation = NULL;
 2779 andres@anarazel.de        668                 :            524 :     SharedJitInstrumentation *jit_instrumentation = NULL;
                                669                 :                :     int         pstmt_len;
                                670                 :                :     int         paramlistinfo_len;
 3872 rhaas@postgresql.org      671                 :            524 :     int         instrumentation_len = 0;
 2779 andres@anarazel.de        672                 :            524 :     int         jit_instrumentation_len = 0;
 3800 rhaas@postgresql.org      673                 :            524 :     int         instrument_offset = 0;
 3424                           674                 :            524 :     Size        dsa_minsize = dsa_minimum_size();
                                675                 :                :     char       *query_string;
                                676                 :                :     int         query_len;
                                677                 :                : 
                                678                 :                :     /*
                                679                 :                :      * Force any initplan outputs that we're going to pass to workers to be
                                680                 :                :      * evaluated, if they weren't already.
                                681                 :                :      *
                                682                 :                :      * For simplicity, we use the EState's per-output-tuple ExprContext here.
                                683                 :                :      * That risks intra-query memory leakage, since we might pass through here
                                684                 :                :      * many times before that ExprContext gets reset; but ExecSetParamPlan
                                685                 :                :      * doesn't normally leak any memory in the context (see its comments), so
                                686                 :                :      * it doesn't seem worth complicating this function's API to pass it a
                                687                 :                :      * shorter-lived ExprContext.  This might need to change someday.
                                688                 :                :      */
 2789 tgl@sss.pgh.pa.us         689         [ +  + ]:            524 :     ExecSetParamPlanMulti(sendParams, GetPerTupleExprContext(estate));
                                690                 :                : 
                                691                 :                :     /* Allocate object for return value. */
  146 michael@paquier.xyz       692                 :GNC         524 :     pei = palloc0_object(ParallelExecutorInfo);
 3821 rhaas@postgresql.org      693                 :CBC         524 :     pei->finished = false;
 3872                           694                 :            524 :     pei->planstate = planstate;
                                695                 :                : 
                                696                 :                :     /* Fix up and serialize plan to be sent to workers. */
 3870                           697                 :            524 :     pstmt_data = ExecSerializePlan(planstate->plan, estate);
                                698                 :                : 
                                699                 :                :     /* Create a parallel context. */
 2608 tmunro@postgresql.or      700                 :            524 :     pcxt = CreateParallelContext("postgres", "ParallelQueryMain", nworkers);
 3872 rhaas@postgresql.org      701                 :            524 :     pei->pcxt = pcxt;
                                702                 :                : 
                                703                 :                :     /*
                                704                 :                :      * Before telling the parallel context to create a dynamic shared memory
                                705                 :                :      * segment, we need to figure out how big it should be.  Estimate space
                                706                 :                :      * for the various things we need to store.
                                707                 :                :      */
                                708                 :                : 
                                709                 :                :     /* Estimate space for fixed-size state. */
 3171                           710                 :            524 :     shm_toc_estimate_chunk(&pcxt->estimator,
                                711                 :                :                            sizeof(FixedParallelExecutorState));
                                712                 :            524 :     shm_toc_estimate_keys(&pcxt->estimator, 1);
                                713                 :                : 
                                714                 :                :     /* Estimate space for query text. */
 1846 tgl@sss.pgh.pa.us         715                 :            524 :     query_len = strlen(estate->es_sourceText);
 3058 rhaas@postgresql.org      716                 :            524 :     shm_toc_estimate_chunk(&pcxt->estimator, query_len + 1);
 3359                           717                 :            524 :     shm_toc_estimate_keys(&pcxt->estimator, 1);
                                718                 :                : 
                                719                 :                :     /* Estimate space for serialized PlannedStmt. */
 3872                           720                 :            524 :     pstmt_len = strlen(pstmt_data) + 1;
                                721                 :            524 :     shm_toc_estimate_chunk(&pcxt->estimator, pstmt_len);
                                722                 :            524 :     shm_toc_estimate_keys(&pcxt->estimator, 1);
                                723                 :                : 
                                724                 :                :     /* Estimate space for serialized ParamListInfo. */
 3092                           725                 :            524 :     paramlistinfo_len = EstimateParamListSpace(estate->es_param_list_info);
                                726                 :            524 :     shm_toc_estimate_chunk(&pcxt->estimator, paramlistinfo_len);
 3872                           727                 :            524 :     shm_toc_estimate_keys(&pcxt->estimator, 1);
                                728                 :                : 
                                729                 :                :     /*
                                730                 :                :      * Estimate space for BufferUsage.
                                731                 :                :      *
                                732                 :                :      * If EXPLAIN is not in use and there are no extensions loaded that care,
                                733                 :                :      * we could skip this.  But we have no way of knowing whether anyone's
                                734                 :                :      * looking at pgBufferUsage, so do it unconditionally.
                                735                 :                :      */
                                736                 :            524 :     shm_toc_estimate_chunk(&pcxt->estimator,
                                737                 :                :                            mul_size(sizeof(BufferUsage), pcxt->nworkers));
                                738                 :            524 :     shm_toc_estimate_keys(&pcxt->estimator, 1);
                                739                 :                : 
                                740                 :                :     /*
                                741                 :                :      * Same thing for WalUsage.
                                742                 :                :      */
 2222 akapila@postgresql.o      743                 :            524 :     shm_toc_estimate_chunk(&pcxt->estimator,
                                744                 :                :                            mul_size(sizeof(WalUsage), pcxt->nworkers));
                                745                 :            524 :     shm_toc_estimate_keys(&pcxt->estimator, 1);
                                746                 :                : 
                                747                 :                :     /* Estimate space for tuple queues. */
 3872 rhaas@postgresql.org      748                 :            524 :     shm_toc_estimate_chunk(&pcxt->estimator,
                                749                 :                :                            mul_size(PARALLEL_TUPLE_QUEUE_SIZE, pcxt->nworkers));
                                750                 :            524 :     shm_toc_estimate_keys(&pcxt->estimator, 1);
                                751                 :                : 
                                752                 :                :     /*
                                753                 :                :      * Give parallel-aware nodes a chance to add to the estimates, and get a
                                754                 :                :      * count of how many PlanState nodes there are.
                                755                 :                :      */
                                756                 :            524 :     e.pcxt = pcxt;
                                757                 :            524 :     e.nnodes = 0;
                                758                 :            524 :     ExecParallelEstimate(planstate, &e);
                                759                 :                : 
                                760                 :                :     /* Estimate space for instrumentation, if required. */
                                761         [ +  + ]:            524 :     if (estate->es_instrument)
                                762                 :                :     {
                                763                 :            120 :         instrumentation_len =
                                764                 :                :             offsetof(SharedExecutorInstrumentation, plan_node_id) +
 3654                           765                 :            120 :             sizeof(int) * e.nnodes;
 3800                           766                 :            120 :         instrumentation_len = MAXALIGN(instrumentation_len);
                                767                 :            120 :         instrument_offset = instrumentation_len;
 3651                           768                 :            120 :         instrumentation_len +=
   30 andres@anarazel.de        769                 :GNC         120 :             mul_size(sizeof(NodeInstrumentation),
 3651 rhaas@postgresql.org      770                 :CBC         120 :                      mul_size(e.nnodes, nworkers));
 3872                           771                 :            120 :         shm_toc_estimate_chunk(&pcxt->estimator, instrumentation_len);
                                772                 :            120 :         shm_toc_estimate_keys(&pcxt->estimator, 1);
                                773                 :                : 
                                774                 :                :         /* Estimate space for JIT instrumentation, if required. */
 2779 andres@anarazel.de        775         [ -  + ]:            120 :         if (estate->es_jit_flags != PGJIT_NONE)
                                776                 :                :         {
 2779 andres@anarazel.de        777                 :LBC        (12) :             jit_instrumentation_len =
                                778                 :           (12) :                 offsetof(SharedJitInstrumentation, jit_instr) +
                                779                 :                :                 sizeof(JitInstrumentation) * nworkers;
                                780                 :           (12) :             shm_toc_estimate_chunk(&pcxt->estimator, jit_instrumentation_len);
                                781                 :           (12) :             shm_toc_estimate_keys(&pcxt->estimator, 1);
                                782                 :                :         }
                                783                 :                :     }
                                784                 :                : 
                                785                 :                :     /* Estimate space for DSA area. */
 3424 rhaas@postgresql.org      786                 :CBC         524 :     shm_toc_estimate_chunk(&pcxt->estimator, dsa_minsize);
                                787                 :            524 :     shm_toc_estimate_keys(&pcxt->estimator, 1);
                                788                 :                : 
                                789                 :                :     /*
                                790                 :                :      * InitializeParallelDSM() passes the active snapshot to the parallel
                                791                 :                :      * worker, which uses it to set es_snapshot.  Make sure we don't set
                                792                 :                :      * es_snapshot differently in the child.
                                793                 :                :      */
  782 heikki.linnakangas@i      794         [ -  + ]:            524 :     Assert(GetActiveSnapshot() == estate->es_snapshot);
                                795                 :                : 
                                796                 :                :     /* Everyone's had a chance to ask for space, so now create the DSM. */
 3872 rhaas@postgresql.org      797                 :            524 :     InitializeParallelDSM(pcxt);
                                798                 :                : 
                                799                 :                :     /*
                                800                 :                :      * OK, now we have a dynamic shared memory segment, and it should be big
                                801                 :                :      * enough to store all of the data we estimated we would want to put into
                                802                 :                :      * it, plus whatever general stuff (not specifically executor-related) the
                                803                 :                :      * ParallelContext itself needs to store there.  None of the space we
                                804                 :                :      * asked for has been allocated or initialized yet, though, so do that.
                                805                 :                :      */
                                806                 :                : 
                                807                 :                :     /* Store fixed-size state. */
 3171                           808                 :            524 :     fpes = shm_toc_allocate(pcxt->toc, sizeof(FixedParallelExecutorState));
                                809                 :            524 :     fpes->tuples_needed = tuples_needed;
 3092                           810                 :            524 :     fpes->param_exec = InvalidDsaPointer;
 3088                           811                 :            524 :     fpes->eflags = estate->es_top_eflags;
 2966 andres@anarazel.de        812                 :            524 :     fpes->jit_flags = estate->es_jit_flags;
 3171 rhaas@postgresql.org      813                 :            524 :     shm_toc_insert(pcxt->toc, PARALLEL_KEY_EXECUTOR_FIXED, fpes);
                                814                 :                : 
                                815                 :                :     /* Store query string */
 3058                           816                 :            524 :     query_string = shm_toc_allocate(pcxt->toc, query_len + 1);
 1846 tgl@sss.pgh.pa.us         817                 :            524 :     memcpy(query_string, estate->es_sourceText, query_len + 1);
 3359 rhaas@postgresql.org      818                 :            524 :     shm_toc_insert(pcxt->toc, PARALLEL_KEY_QUERY_TEXT, query_string);
                                819                 :                : 
                                820                 :                :     /* Store serialized PlannedStmt. */
 3872                           821                 :            524 :     pstmt_space = shm_toc_allocate(pcxt->toc, pstmt_len);
                                822                 :            524 :     memcpy(pstmt_space, pstmt_data, pstmt_len);
                                823                 :            524 :     shm_toc_insert(pcxt->toc, PARALLEL_KEY_PLANNEDSTMT, pstmt_space);
                                824                 :                : 
                                825                 :                :     /* Store serialized ParamListInfo. */
 3092                           826                 :            524 :     paramlistinfo_space = shm_toc_allocate(pcxt->toc, paramlistinfo_len);
                                827                 :            524 :     shm_toc_insert(pcxt->toc, PARALLEL_KEY_PARAMLISTINFO, paramlistinfo_space);
                                828                 :            524 :     SerializeParamList(estate->es_param_list_info, &paramlistinfo_space);
                                829                 :                : 
                                830                 :                :     /* Allocate space for each worker's BufferUsage; no need to initialize. */
 3872                           831                 :            524 :     bufusage_space = shm_toc_allocate(pcxt->toc,
 3240 tgl@sss.pgh.pa.us         832                 :            524 :                                       mul_size(sizeof(BufferUsage), pcxt->nworkers));
 3872 rhaas@postgresql.org      833                 :            524 :     shm_toc_insert(pcxt->toc, PARALLEL_KEY_BUFFER_USAGE, bufusage_space);
                                834                 :            524 :     pei->buffer_usage = bufusage_space;
                                835                 :                : 
                                836                 :                :     /* Same for WalUsage. */
 2222 akapila@postgresql.o      837                 :            524 :     walusage_space = shm_toc_allocate(pcxt->toc,
                                838                 :            524 :                                       mul_size(sizeof(WalUsage), pcxt->nworkers));
                                839                 :            524 :     shm_toc_insert(pcxt->toc, PARALLEL_KEY_WAL_USAGE, walusage_space);
                                840                 :            524 :     pei->wal_usage = walusage_space;
                                841                 :                : 
                                842                 :                :     /* Set up the tuple queues that the workers will write into. */
 3840 rhaas@postgresql.org      843                 :            524 :     pei->tqueue = ExecParallelSetupTupleQueues(pcxt, false);
                                844                 :                : 
                                845                 :                :     /* We don't need the TupleQueueReaders yet, though. */
 3168 tgl@sss.pgh.pa.us         846                 :            524 :     pei->reader = NULL;
                                847                 :                : 
                                848                 :                :     /*
                                849                 :                :      * If instrumentation options were supplied, allocate space for the data.
                                850                 :                :      * It only gets partially initialized here; the rest happens during
                                851                 :                :      * ExecParallelInitializeDSM.
                                852                 :                :      */
 3872 rhaas@postgresql.org      853         [ +  + ]:            524 :     if (estate->es_instrument)
                                854                 :                :     {
                                855                 :                :         NodeInstrumentation *instrument;
                                856                 :                :         int         i;
                                857                 :                : 
                                858                 :            120 :         instrumentation = shm_toc_allocate(pcxt->toc, instrumentation_len);
                                859                 :            120 :         instrumentation->instrument_options = estate->es_instrument;
 3800                           860                 :            120 :         instrumentation->instrument_offset = instrument_offset;
                                861                 :            120 :         instrumentation->num_workers = nworkers;
                                862                 :            120 :         instrumentation->num_plan_nodes = e.nnodes;
                                863                 :            120 :         instrument = GetInstrumentationArray(instrumentation);
                                864         [ +  + ]:           1240 :         for (i = 0; i < nworkers * e.nnodes; ++i)
   30 andres@anarazel.de        865                 :GNC        1120 :             InstrInitNode(&instrument[i], estate->es_instrument, false);
 3872 rhaas@postgresql.org      866                 :CBC         120 :         shm_toc_insert(pcxt->toc, PARALLEL_KEY_INSTRUMENTATION,
                                867                 :                :                        instrumentation);
                                868                 :            120 :         pei->instrumentation = instrumentation;
                                869                 :                : 
 2779 andres@anarazel.de        870         [ -  + ]:            120 :         if (estate->es_jit_flags != PGJIT_NONE)
                                871                 :                :         {
 2779 andres@anarazel.de        872                 :LBC        (12) :             jit_instrumentation = shm_toc_allocate(pcxt->toc,
                                873                 :                :                                                    jit_instrumentation_len);
                                874                 :           (12) :             jit_instrumentation->num_workers = nworkers;
                                875                 :           (12) :             memset(jit_instrumentation->jit_instr, 0,
                                876                 :                :                    sizeof(JitInstrumentation) * nworkers);
                                877                 :           (12) :             shm_toc_insert(pcxt->toc, PARALLEL_KEY_JIT_INSTRUMENTATION,
                                878                 :                :                            jit_instrumentation);
                                879                 :           (12) :             pei->jit_instrumentation = jit_instrumentation;
                                880                 :                :         }
                                881                 :                :     }
                                882                 :                : 
                                883                 :                :     /*
                                884                 :                :      * Create a DSA area that can be used by the leader and all workers.
                                885                 :                :      * (However, if we failed to create a DSM and are using private memory
                                886                 :                :      * instead, then skip this.)
                                887                 :                :      */
 3424 rhaas@postgresql.org      888         [ +  - ]:CBC         524 :     if (pcxt->seg != NULL)
                                889                 :                :     {
                                890                 :                :         char       *area_space;
                                891                 :                : 
                                892                 :            524 :         area_space = shm_toc_allocate(pcxt->toc, dsa_minsize);
                                893                 :            524 :         shm_toc_insert(pcxt->toc, PARALLEL_KEY_DSA, area_space);
                                894                 :            524 :         pei->area = dsa_create_in_place(area_space, dsa_minsize,
                                895                 :                :                                         LWTRANCHE_PARALLEL_QUERY_DSA,
                                896                 :                :                                         pcxt->seg);
                                897                 :                : 
                                898                 :                :         /*
                                899                 :                :          * Serialize parameters, if any, using DSA storage.  We don't dare use
                                900                 :                :          * the main parallel query DSM for this because we might relaunch
                                901                 :                :          * workers after the values have changed (and thus the amount of
                                902                 :                :          * storage required has changed).
                                903                 :                :          */
 3092                           904         [ +  + ]:            524 :         if (!bms_is_empty(sendParams))
                                905                 :                :         {
 3060                           906                 :             16 :             pei->param_exec = SerializeParamExecParams(estate, sendParams,
                                907                 :                :                                                        pei->area);
 3092                           908                 :             16 :             fpes->param_exec = pei->param_exec;
                                909                 :                :         }
                                910                 :                :     }
                                911                 :                : 
                                912                 :                :     /*
                                913                 :                :      * Give parallel-aware nodes a chance to initialize their shared data.
                                914                 :                :      * This also initializes the elements of instrumentation->ps_instrument,
                                915                 :                :      * if it exists.
                                916                 :                :      */
 3872                           917                 :            524 :     d.pcxt = pcxt;
                                918                 :            524 :     d.instrumentation = instrumentation;
                                919                 :            524 :     d.nnodes = 0;
                                920                 :                : 
                                921                 :                :     /* Install our DSA area while initializing the plan. */
 3060                           922                 :            524 :     estate->es_query_dsa = pei->area;
 3872                           923                 :            524 :     ExecParallelInitializeDSM(planstate, &d);
 3060                           924                 :            524 :     estate->es_query_dsa = NULL;
                                925                 :                : 
                                926                 :                :     /*
                                927                 :                :      * Make sure that the world hasn't shifted under our feet.  This could
                                928                 :                :      * probably just be an Assert(), but let's be conservative for now.
                                929                 :                :      */
 3872                           930         [ -  + ]:            524 :     if (e.nnodes != d.nnodes)
 3872 rhaas@postgresql.org      931         [ #  # ]:UBC           0 :         elog(ERROR, "inconsistent count of PlanState nodes");
                                932                 :                : 
                                933                 :                :     /* OK, we're ready to rock and roll. */
 3872 rhaas@postgresql.org      934                 :CBC         524 :     return pei;
                                935                 :                : }
                                936                 :                : 
                                937                 :                : /*
                                938                 :                :  * Set up tuple queue readers to read the results of a parallel subplan.
                                939                 :                :  *
                                940                 :                :  * This is separate from ExecInitParallelPlan() because we can launch the
                                941                 :                :  * worker processes and let them start doing something before we do this.
                                942                 :                :  */
                                943                 :                : void
 3155 andres@anarazel.de        944                 :            683 : ExecParallelCreateReaders(ParallelExecutorInfo *pei)
                                945                 :                : {
 3168 tgl@sss.pgh.pa.us         946                 :            683 :     int         nworkers = pei->pcxt->nworkers_launched;
                                947                 :                :     int         i;
                                948                 :                : 
                                949         [ -  + ]:            683 :     Assert(pei->reader == NULL);
                                950                 :                : 
                                951         [ +  - ]:            683 :     if (nworkers > 0)
                                952                 :                :     {
                                953                 :            683 :         pei->reader = (TupleQueueReader **)
                                954                 :            683 :             palloc(nworkers * sizeof(TupleQueueReader *));
                                955                 :                : 
                                956         [ +  + ]:           2499 :         for (i = 0; i < nworkers; i++)
                                957                 :                :         {
                                958                 :           1816 :             shm_mq_set_handle(pei->tqueue[i],
                                959                 :           1816 :                               pei->pcxt->worker[i].bgwhandle);
 3155 andres@anarazel.de        960                 :           1816 :             pei->reader[i] = CreateTupleQueueReader(pei->tqueue[i]);
                                961                 :                :         }
                                962                 :                :     }
 3168 tgl@sss.pgh.pa.us         963                 :            683 : }
                                964                 :                : 
                                965                 :                : /*
                                966                 :                :  * Re-initialize the parallel executor shared memory state before launching
                                967                 :                :  * a fresh batch of workers.
                                968                 :                :  */
                                969                 :                : void
 3170                           970                 :            172 : ExecParallelReinitialize(PlanState *planstate,
                                971                 :                :                          ParallelExecutorInfo *pei,
                                972                 :                :                          Bitmapset *sendParams)
                                973                 :                : {
 3092 rhaas@postgresql.org      974                 :            172 :     EState     *estate = planstate->state;
                                975                 :                :     FixedParallelExecutorState *fpes;
                                976                 :                : 
                                977                 :                :     /* Old workers must already be shut down */
 3170 tgl@sss.pgh.pa.us         978         [ -  + ]:            172 :     Assert(pei->finished);
                                979                 :                : 
                                980                 :                :     /*
                                981                 :                :      * Force any initplan outputs that we're going to pass to workers to be
                                982                 :                :      * evaluated, if they weren't already (see comments in
                                983                 :                :      * ExecInitParallelPlan).
                                984                 :                :      */
 2789                           985         [ +  - ]:            172 :     ExecSetParamPlanMulti(sendParams, GetPerTupleExprContext(estate));
                                986                 :                : 
 3170                           987                 :            172 :     ReinitializeParallelDSM(pei->pcxt);
                                988                 :            172 :     pei->tqueue = ExecParallelSetupTupleQueues(pei->pcxt, true);
 3168                           989                 :            172 :     pei->reader = NULL;
 3170                           990                 :            172 :     pei->finished = false;
                                991                 :                : 
 3092 rhaas@postgresql.org      992                 :            172 :     fpes = shm_toc_lookup(pei->pcxt->toc, PARALLEL_KEY_EXECUTOR_FIXED, false);
                                993                 :                : 
                                994                 :                :     /* Free any serialized parameters from the last round. */
                                995         [ -  + ]:            172 :     if (DsaPointerIsValid(fpes->param_exec))
                                996                 :                :     {
 3060 rhaas@postgresql.org      997                 :UBC           0 :         dsa_free(pei->area, fpes->param_exec);
 3092                           998                 :              0 :         fpes->param_exec = InvalidDsaPointer;
                                999                 :                :     }
                               1000                 :                : 
                               1001                 :                :     /* Serialize current parameter values if required. */
 3092 rhaas@postgresql.org     1002         [ -  + ]:CBC         172 :     if (!bms_is_empty(sendParams))
                               1003                 :                :     {
 3060 rhaas@postgresql.org     1004                 :UBC           0 :         pei->param_exec = SerializeParamExecParams(estate, sendParams,
                               1005                 :                :                                                    pei->area);
 3092                          1006                 :              0 :         fpes->param_exec = pei->param_exec;
                               1007                 :                :     }
                               1008                 :                : 
                               1009                 :                :     /* Traverse plan tree and let each child node reset associated state. */
 3060 rhaas@postgresql.org     1010                 :CBC         172 :     estate->es_query_dsa = pei->area;
 3170 tgl@sss.pgh.pa.us        1011                 :            172 :     ExecParallelReInitializeDSM(planstate, pei->pcxt);
 3060 rhaas@postgresql.org     1012                 :            172 :     estate->es_query_dsa = NULL;
 3170 tgl@sss.pgh.pa.us        1013                 :            172 : }
                               1014                 :                : 
                               1015                 :                : /*
                               1016                 :                :  * Traverse plan tree to reinitialize per-node dynamic shared memory state
                               1017                 :                :  */
                               1018                 :                : static bool
                               1019                 :            444 : ExecParallelReInitializeDSM(PlanState *planstate,
                               1020                 :                :                             ParallelContext *pcxt)
                               1021                 :                : {
                               1022         [ -  + ]:            444 :     if (planstate == NULL)
 3170 tgl@sss.pgh.pa.us        1023                 :UBC           0 :         return false;
                               1024                 :                : 
                               1025                 :                :     /*
                               1026                 :                :      * Call reinitializers for DSM-using plan nodes.
                               1027                 :                :      */
 3170 tgl@sss.pgh.pa.us        1028   [ +  +  +  -  :CBC         444 :     switch (nodeTag(planstate))
                                     -  -  -  +  +  
                                              +  + ]
                               1029                 :                :     {
                               1030                 :            184 :         case T_SeqScanState:
                               1031         [ +  + ]:            184 :             if (planstate->plan->parallel_aware)
                               1032                 :            152 :                 ExecSeqScanReInitializeDSM((SeqScanState *) planstate,
                               1033                 :                :                                            pcxt);
                               1034                 :            184 :             break;
                               1035                 :              8 :         case T_IndexScanState:
                               1036         [ +  - ]:              8 :             if (planstate->plan->parallel_aware)
                               1037                 :              8 :                 ExecIndexScanReInitializeDSM((IndexScanState *) planstate,
                               1038                 :                :                                              pcxt);
                               1039                 :              8 :             break;
                               1040                 :              8 :         case T_IndexOnlyScanState:
                               1041         [ +  - ]:              8 :             if (planstate->plan->parallel_aware)
                               1042                 :              8 :                 ExecIndexOnlyScanReInitializeDSM((IndexOnlyScanState *) planstate,
                               1043                 :                :                                                  pcxt);
                               1044                 :              8 :             break;
 3170 tgl@sss.pgh.pa.us        1045                 :UBC           0 :         case T_ForeignScanState:
                               1046         [ #  # ]:              0 :             if (planstate->plan->parallel_aware)
                               1047                 :              0 :                 ExecForeignScanReInitializeDSM((ForeignScanState *) planstate,
                               1048                 :                :                                                pcxt);
                               1049                 :              0 :             break;
  159 drowley@postgresql.o     1050                 :UNC           0 :         case T_TidRangeScanState:
                               1051         [ #  # ]:              0 :             if (planstate->plan->parallel_aware)
                               1052                 :              0 :                 ExecTidRangeScanReInitializeDSM((TidRangeScanState *) planstate,
                               1053                 :                :                                                 pcxt);
                               1054                 :              0 :             break;
 3073 rhaas@postgresql.org     1055                 :UBC           0 :         case T_AppendState:
                               1056         [ #  # ]:              0 :             if (planstate->plan->parallel_aware)
                               1057                 :              0 :                 ExecAppendReInitializeDSM((AppendState *) planstate, pcxt);
                               1058                 :              0 :             break;
 3170 tgl@sss.pgh.pa.us        1059                 :              0 :         case T_CustomScanState:
                               1060         [ #  # ]:              0 :             if (planstate->plan->parallel_aware)
                               1061                 :              0 :                 ExecCustomScanReInitializeDSM((CustomScanState *) planstate,
                               1062                 :                :                                               pcxt);
                               1063                 :              0 :             break;
 3170 tgl@sss.pgh.pa.us        1064                 :CBC          36 :         case T_BitmapHeapScanState:
                               1065         [ +  - ]:             36 :             if (planstate->plan->parallel_aware)
                               1066                 :             36 :                 ExecBitmapHeapReInitializeDSM((BitmapHeapScanState *) planstate,
                               1067                 :                :                                               pcxt);
                               1068                 :             36 :             break;
 3058 andres@anarazel.de       1069                 :             64 :         case T_HashJoinState:
                               1070         [ +  + ]:             64 :             if (planstate->plan->parallel_aware)
                               1071                 :             32 :                 ExecHashJoinReInitializeDSM((HashJoinState *) planstate,
                               1072                 :                :                                             pcxt);
                               1073                 :             64 :             break;
  420 pg@bowt.ie               1074                 :            120 :         case T_BitmapIndexScanState:
                               1075                 :                :         case T_HashState:
                               1076                 :                :         case T_SortState:
                               1077                 :                :         case T_IncrementalSortState:
                               1078                 :                :         case T_MemoizeState:
                               1079                 :                :             /* these nodes have DSM state, but no reinitialization is required */
 3170 tgl@sss.pgh.pa.us        1080                 :            120 :             break;
                               1081                 :                : 
                               1082                 :             24 :         default:
                               1083                 :             24 :             break;
                               1084                 :                :     }
                               1085                 :                : 
                               1086                 :            444 :     return planstate_tree_walker(planstate, ExecParallelReInitializeDSM, pcxt);
                               1087                 :                : }
                               1088                 :                : 
                               1089                 :                : /*
                               1090                 :                :  * Copy instrumentation information about this node and its descendants from
                               1091                 :                :  * dynamic shared memory.
                               1092                 :                :  */
                               1093                 :                : static bool
 3872 rhaas@postgresql.org     1094                 :            684 : ExecParallelRetrieveInstrumentation(PlanState *planstate,
                               1095                 :                :                                     SharedExecutorInstrumentation *instrumentation)
                               1096                 :                : {
                               1097                 :                :     NodeInstrumentation *instrument;
                               1098                 :                :     int         i;
                               1099                 :                :     int         n;
                               1100                 :                :     int         ibytes;
 3617                          1101                 :            684 :     int         plan_node_id = planstate->plan->plan_node_id;
                               1102                 :                :     MemoryContext oldcontext;
                               1103                 :                : 
                               1104                 :                :     /* Find the instrumentation for this node. */
 3800                          1105         [ +  - ]:           3092 :     for (i = 0; i < instrumentation->num_plan_nodes; ++i)
                               1106         [ +  + ]:           3092 :         if (instrumentation->plan_node_id[i] == plan_node_id)
 3872                          1107                 :            684 :             break;
 3800                          1108         [ -  + ]:            684 :     if (i >= instrumentation->num_plan_nodes)
 3872 rhaas@postgresql.org     1109         [ #  # ]:UBC           0 :         elog(ERROR, "plan node %d not found", plan_node_id);
                               1110                 :                : 
                               1111                 :                :     /* Accumulate the statistics from all workers. */
 3800 rhaas@postgresql.org     1112                 :CBC         684 :     instrument = GetInstrumentationArray(instrumentation);
                               1113                 :            684 :     instrument += i * instrumentation->num_workers;
                               1114         [ +  + ]:           1804 :     for (n = 0; n < instrumentation->num_workers; ++n)
                               1115                 :           1120 :         InstrAggNode(planstate->instrument, &instrument[n]);
                               1116                 :                : 
                               1117                 :                :     /*
                               1118                 :                :      * Also store the per-worker detail.
                               1119                 :                :      *
                               1120                 :                :      * Worker instrumentation should be allocated in the same context as the
                               1121                 :                :      * regular instrumentation information, which is the per-query context.
                               1122                 :                :      * Switch into per-query memory context.
                               1123                 :                :      */
 3065                          1124                 :            684 :     oldcontext = MemoryContextSwitchTo(planstate->state->es_query_cxt);
   30 andres@anarazel.de       1125                 :GNC         684 :     ibytes = mul_size(instrumentation->num_workers, sizeof(NodeInstrumentation));
 3065 rhaas@postgresql.org     1126                 :CBC         684 :     planstate->worker_instrument =
   30 andres@anarazel.de       1127                 :GNC         684 :         palloc(ibytes + offsetof(WorkerNodeInstrumentation, instrument));
 3065 rhaas@postgresql.org     1128                 :CBC         684 :     MemoryContextSwitchTo(oldcontext);
                               1129                 :                : 
 3800                          1130                 :            684 :     planstate->worker_instrument->num_workers = instrumentation->num_workers;
 3065                          1131                 :            684 :     memcpy(&planstate->worker_instrument->instrument, instrument, ibytes);
                               1132                 :                : 
                               1133                 :                :     /* Perform any node-type-specific work that needs to be done. */
 3073 andres@anarazel.de       1134   [ +  -  -  +  :            684 :     switch (nodeTag(planstate))
                                     -  +  +  -  -  
                                           +  -  + ]
                               1135                 :                :     {
  420 pg@bowt.ie               1136                 :            180 :         case T_IndexScanState:
                               1137                 :            180 :             ExecIndexScanRetrieveInstrumentation((IndexScanState *) planstate);
                               1138                 :            180 :             break;
  420 pg@bowt.ie               1139                 :UBC           0 :         case T_IndexOnlyScanState:
                               1140                 :              0 :             ExecIndexOnlyScanRetrieveInstrumentation((IndexOnlyScanState *) planstate);
                               1141                 :              0 :             break;
                               1142                 :              0 :         case T_BitmapIndexScanState:
                               1143                 :              0 :             ExecBitmapIndexScanRetrieveInstrumentation((BitmapIndexScanState *) planstate);
                               1144                 :              0 :             break;
 3073 andres@anarazel.de       1145                 :CBC           8 :         case T_SortState:
                               1146                 :              8 :             ExecSortRetrieveInstrumentation((SortState *) planstate);
                               1147                 :              8 :             break;
 2220 tomas.vondra@postgre     1148                 :UBC           0 :         case T_IncrementalSortState:
                               1149                 :              0 :             ExecIncrementalSortRetrieveInstrumentation((IncrementalSortState *) planstate);
                               1150                 :              0 :             break;
 3073 andres@anarazel.de       1151                 :CBC          56 :         case T_HashState:
                               1152                 :             56 :             ExecHashRetrieveInstrumentation((HashState *) planstate);
                               1153                 :             56 :             break;
 2146 drowley@postgresql.o     1154                 :             68 :         case T_AggState:
                               1155                 :             68 :             ExecAggRetrieveInstrumentation((AggState *) planstate);
                               1156                 :             68 :             break;
 1756 drowley@postgresql.o     1157                 :UBC           0 :         case T_MemoizeState:
                               1158                 :              0 :             ExecMemoizeRetrieveInstrumentation((MemoizeState *) planstate);
 1859                          1159                 :              0 :             break;
  665                          1160                 :              0 :         case T_BitmapHeapScanState:
                               1161                 :              0 :             ExecBitmapHeapRetrieveInstrumentation((BitmapHeapScanState *) planstate);
                               1162                 :              0 :             break;
   28 tomas.vondra@postgre     1163                 :GNC         232 :         case T_SeqScanState:
                               1164                 :            232 :             ExecSeqScanRetrieveInstrumentation((SeqScanState *) planstate);
                               1165                 :            232 :             break;
   28 tomas.vondra@postgre     1166                 :UNC           0 :         case T_TidRangeScanState:
                               1167                 :              0 :             ExecTidRangeScanRetrieveInstrumentation((TidRangeScanState *) planstate);
                               1168                 :              0 :             break;
 3073 andres@anarazel.de       1169                 :CBC         140 :         default:
                               1170                 :            140 :             break;
                               1171                 :                :     }
                               1172                 :                : 
 3872 rhaas@postgresql.org     1173                 :            684 :     return planstate_tree_walker(planstate, ExecParallelRetrieveInstrumentation,
                               1174                 :                :                                  instrumentation);
                               1175                 :                : }
                               1176                 :                : 
                               1177                 :                : /*
                               1178                 :                :  * Add up the workers' JIT instrumentation from dynamic shared memory.
                               1179                 :                :  */
                               1180                 :                : static void
 2779 andres@anarazel.de       1181                 :LBC        (12) : ExecParallelRetrieveJitInstrumentation(PlanState *planstate,
                               1182                 :                :                                        SharedJitInstrumentation *shared_jit)
                               1183                 :                : {
                               1184                 :                :     JitInstrumentation *combined;
                               1185                 :                :     int         ibytes;
                               1186                 :                : 
                               1187                 :                :     int         n;
                               1188                 :                : 
                               1189                 :                :     /*
                               1190                 :                :      * Accumulate worker JIT instrumentation into the combined JIT
                               1191                 :                :      * instrumentation, allocating it if required.
                               1192                 :                :      */
 2771                          1193         [ #  # ]:           (12) :     if (!planstate->state->es_jit_worker_instr)
                               1194                 :           (12) :         planstate->state->es_jit_worker_instr =
 2779                          1195                 :           (12) :             MemoryContextAllocZero(planstate->state->es_query_cxt, sizeof(JitInstrumentation));
 2771                          1196                 :           (12) :     combined = planstate->state->es_jit_worker_instr;
                               1197                 :                : 
                               1198                 :                :     /* Accumulate all the workers' instrumentations. */
 2779                          1199         [ #  # ]:           (36) :     for (n = 0; n < shared_jit->num_workers; ++n)
                               1200                 :           (24) :         InstrJitAgg(combined, &shared_jit->jit_instr[n]);
                               1201                 :                : 
                               1202                 :                :     /*
                               1203                 :                :      * Store the per-worker detail.
                               1204                 :                :      *
                               1205                 :                :      * Similar to ExecParallelRetrieveInstrumentation(), allocate the
                               1206                 :                :      * instrumentation in per-query context.
                               1207                 :                :      */
                               1208                 :           (12) :     ibytes = offsetof(SharedJitInstrumentation, jit_instr)
 2540 tgl@sss.pgh.pa.us        1209                 :           (12) :         + mul_size(shared_jit->num_workers, sizeof(JitInstrumentation));
 2779 andres@anarazel.de       1210                 :           (12) :     planstate->worker_jit_instrument =
                               1211                 :           (12) :         MemoryContextAlloc(planstate->state->es_query_cxt, ibytes);
                               1212                 :                : 
                               1213                 :           (12) :     memcpy(planstate->worker_jit_instrument, shared_jit, ibytes);
                               1214                 :           (12) : }
                               1215                 :                : 
                               1216                 :                : /*
                               1217                 :                :  * Finish parallel execution.  We wait for parallel workers to finish, and
                               1218                 :                :  * accumulate their buffer/WAL usage.
                               1219                 :                :  */
                               1220                 :                : void
 3872 rhaas@postgresql.org     1221                 :CBC        1248 : ExecParallelFinish(ParallelExecutorInfo *pei)
                               1222                 :                : {
 3168 tgl@sss.pgh.pa.us        1223                 :           1248 :     int         nworkers = pei->pcxt->nworkers_launched;
                               1224                 :                :     int         i;
                               1225                 :                : 
                               1226                 :                :     /* Make this be a no-op if called twice in a row. */
 3821 rhaas@postgresql.org     1227         [ +  + ]:           1248 :     if (pei->finished)
                               1228                 :            560 :         return;
                               1229                 :                : 
                               1230                 :                :     /*
                               1231                 :                :      * Detach from tuple queues ASAP, so that any still-active workers will
                               1232                 :                :      * notice that no further results are wanted.
                               1233                 :                :      */
 3168 tgl@sss.pgh.pa.us        1234         [ +  - ]:            688 :     if (pei->tqueue != NULL)
                               1235                 :                :     {
                               1236         [ +  + ]:           2496 :         for (i = 0; i < nworkers; i++)
                               1237                 :           1808 :             shm_mq_detach(pei->tqueue[i]);
                               1238                 :            688 :         pfree(pei->tqueue);
                               1239                 :            688 :         pei->tqueue = NULL;
                               1240                 :                :     }
                               1241                 :                : 
                               1242                 :                :     /*
                               1243                 :                :      * While we're waiting for the workers to finish, let's get rid of the
                               1244                 :                :      * tuple queue readers.  (Any other local cleanup could be done here too.)
                               1245                 :                :      */
                               1246         [ +  + ]:            688 :     if (pei->reader != NULL)
                               1247                 :                :     {
                               1248         [ +  + ]:           2483 :         for (i = 0; i < nworkers; i++)
                               1249                 :           1808 :             DestroyTupleQueueReader(pei->reader[i]);
                               1250                 :            675 :         pfree(pei->reader);
                               1251                 :            675 :         pei->reader = NULL;
                               1252                 :                :     }
                               1253                 :                : 
                               1254                 :                :     /* Now wait for the workers to finish. */
 3872 rhaas@postgresql.org     1255                 :            688 :     WaitForParallelWorkersToFinish(pei->pcxt);
                               1256                 :                : 
                               1257                 :                :     /*
                               1258                 :                :      * Next, accumulate buffer/WAL usage.  (This must wait for the workers to
                               1259                 :                :      * finish, or we might get incomplete data.)
                               1260                 :                :      */
 3168 tgl@sss.pgh.pa.us        1261         [ +  + ]:           2496 :     for (i = 0; i < nworkers; i++)
 2222 akapila@postgresql.o     1262                 :           1808 :         InstrAccumParallelQuery(&pei->buffer_usage[i], &pei->wal_usage[i]);
                               1263                 :                : 
 3821 rhaas@postgresql.org     1264                 :            688 :     pei->finished = true;
                               1265                 :                : }
                               1266                 :                : 
                               1267                 :                : /*
                               1268                 :                :  * Accumulate instrumentation, and then clean up whatever ParallelExecutorInfo
                               1269                 :                :  * resources still exist after ExecParallelFinish.  We separate these
                               1270                 :                :  * routines because someone might want to examine the contents of the DSM
                               1271                 :                :  * after ExecParallelFinish and before calling this routine.
                               1272                 :                :  */
                               1273                 :                : void
 3854                          1274                 :            516 : ExecParallelCleanup(ParallelExecutorInfo *pei)
                               1275                 :                : {
                               1276                 :                :     /* Accumulate instrumentation, if any. */
 3059                          1277         [ +  + ]:            516 :     if (pei->instrumentation)
                               1278                 :            120 :         ExecParallelRetrieveInstrumentation(pei->planstate,
                               1279                 :                :                                             pei->instrumentation);
                               1280                 :                : 
                               1281                 :                :     /* Accumulate JIT instrumentation, if any. */
 2779 andres@anarazel.de       1282         [ -  + ]:            516 :     if (pei->jit_instrumentation)
 2779 andres@anarazel.de       1283                 :LBC        (12) :         ExecParallelRetrieveJitInstrumentation(pei->planstate,
 2540 tgl@sss.pgh.pa.us        1284                 :           (12) :                                                pei->jit_instrumentation);
                               1285                 :                : 
                               1286                 :                :     /* Free any serialized parameters. */
 3092 rhaas@postgresql.org     1287         [ +  + ]:CBC         516 :     if (DsaPointerIsValid(pei->param_exec))
                               1288                 :                :     {
                               1289                 :             16 :         dsa_free(pei->area, pei->param_exec);
                               1290                 :             16 :         pei->param_exec = InvalidDsaPointer;
                               1291                 :                :     }
 3424                          1292         [ +  - ]:            516 :     if (pei->area != NULL)
                               1293                 :                :     {
                               1294                 :            516 :         dsa_detach(pei->area);
                               1295                 :            516 :         pei->area = NULL;
                               1296                 :                :     }
 3854                          1297         [ +  - ]:            516 :     if (pei->pcxt != NULL)
                               1298                 :                :     {
                               1299                 :            516 :         DestroyParallelContext(pei->pcxt);
                               1300                 :            516 :         pei->pcxt = NULL;
                               1301                 :                :     }
                               1302                 :            516 :     pfree(pei);
                               1303                 :            516 : }
                               1304                 :                : 
                               1305                 :                : /*
                               1306                 :                :  * Create a DestReceiver to write tuples we produce to the shm_mq designated
                               1307                 :                :  * for that purpose.
                               1308                 :                :  */
                               1309                 :                : static DestReceiver *
 3872                          1310                 :           1816 : ExecParallelGetReceiver(dsm_segment *seg, shm_toc *toc)
                               1311                 :                : {
                               1312                 :                :     char       *mqspace;
                               1313                 :                :     shm_mq     *mq;
                               1314                 :                : 
 3256 tgl@sss.pgh.pa.us        1315                 :           1816 :     mqspace = shm_toc_lookup(toc, PARALLEL_KEY_TUPLE_QUEUE, false);
 3872 rhaas@postgresql.org     1316                 :           1816 :     mqspace += ParallelWorkerNumber * PARALLEL_TUPLE_QUEUE_SIZE;
                               1317                 :           1816 :     mq = (shm_mq *) mqspace;
                               1318                 :           1816 :     shm_mq_set_sender(mq, MyProc);
                               1319                 :           1816 :     return CreateTupleQueueDestReceiver(shm_mq_attach(mq, seg, NULL));
                               1320                 :                : }
                               1321                 :                : 
                               1322                 :                : /*
                               1323                 :                :  * Create a QueryDesc for the PlannedStmt we are to execute, and return it.
                               1324                 :                :  */
                               1325                 :                : static QueryDesc *
                               1326                 :           1816 : ExecParallelGetQueryDesc(shm_toc *toc, DestReceiver *receiver,
                               1327                 :                :                          int instrument_options)
                               1328                 :                : {
                               1329                 :                :     char       *pstmtspace;
                               1330                 :                :     char       *paramspace;
                               1331                 :                :     PlannedStmt *pstmt;
                               1332                 :                :     ParamListInfo paramLI;
                               1333                 :                :     char       *queryString;
                               1334                 :                : 
                               1335                 :                :     /* Get the query string from shared memory */
 3256 tgl@sss.pgh.pa.us        1336                 :           1816 :     queryString = shm_toc_lookup(toc, PARALLEL_KEY_QUERY_TEXT, false);
                               1337                 :                : 
                               1338                 :                :     /* Reconstruct leader-supplied PlannedStmt. */
                               1339                 :           1816 :     pstmtspace = shm_toc_lookup(toc, PARALLEL_KEY_PLANNEDSTMT, false);
 3872 rhaas@postgresql.org     1340                 :           1816 :     pstmt = (PlannedStmt *) stringToNode(pstmtspace);
                               1341                 :                : 
                               1342                 :                :     /* Reconstruct ParamListInfo. */
 3092                          1343                 :           1816 :     paramspace = shm_toc_lookup(toc, PARALLEL_KEY_PARAMLISTINFO, false);
 3872                          1344                 :           1816 :     paramLI = RestoreParamList(&paramspace);
                               1345                 :                : 
                               1346                 :                :     /* Create a QueryDesc for the query. */
                               1347                 :           1816 :     return CreateQueryDesc(pstmt,
                               1348                 :                :                            queryString,
                               1349                 :                :                            GetActiveSnapshot(), InvalidSnapshot,
                               1350                 :                :                            receiver, paramLI, NULL, instrument_options);
                               1351                 :                : }
                               1352                 :                : 
                               1353                 :                : /*
                               1354                 :                :  * Copy instrumentation information from this node and its descendants into
                               1355                 :                :  * dynamic shared memory, so that the parallel leader can retrieve it.
                               1356                 :                :  */
                               1357                 :                : static bool
                               1358                 :           1584 : ExecParallelReportInstrumentation(PlanState *planstate,
                               1359                 :                :                                   SharedExecutorInstrumentation *instrumentation)
                               1360                 :                : {
                               1361                 :                :     int         i;
 3617                          1362                 :           1584 :     int         plan_node_id = planstate->plan->plan_node_id;
                               1363                 :                :     NodeInstrumentation *instrument;
                               1364                 :                : 
 3800                          1365                 :           1584 :     InstrEndLoop(planstate->instrument);
                               1366                 :                : 
                               1367                 :                :     /*
                               1368                 :                :      * If we shuffled the plan_node_id values in ps_instrument into sorted
                               1369                 :                :      * order, we could use binary search here.  This might matter someday if
                               1370                 :                :      * we're pushing down sufficiently large plan trees.  For now, do it the
                               1371                 :                :      * slow, dumb way.
                               1372                 :                :      */
                               1373         [ +  - ]:           5208 :     for (i = 0; i < instrumentation->num_plan_nodes; ++i)
                               1374         [ +  + ]:           5208 :         if (instrumentation->plan_node_id[i] == plan_node_id)
 3872                          1375                 :           1584 :             break;
 3800                          1376         [ -  + ]:           1584 :     if (i >= instrumentation->num_plan_nodes)
 3872 rhaas@postgresql.org     1377         [ #  # ]:UBC           0 :         elog(ERROR, "plan node %d not found", plan_node_id);
                               1378                 :                : 
                               1379                 :                :     /*
                               1380                 :                :      * Add our statistics to the per-node, per-worker totals.  It's possible
                               1381                 :                :      * that this could happen more than once if we relaunched workers.
                               1382                 :                :      */
 3800 rhaas@postgresql.org     1383                 :CBC        1584 :     instrument = GetInstrumentationArray(instrumentation);
                               1384                 :           1584 :     instrument += i * instrumentation->num_workers;
                               1385         [ -  + ]:           1584 :     Assert(IsParallelWorker());
                               1386         [ -  + ]:           1584 :     Assert(ParallelWorkerNumber < instrumentation->num_workers);
                               1387                 :           1584 :     InstrAggNode(&instrument[ParallelWorkerNumber], planstate->instrument);
                               1388                 :                : 
 3872                          1389                 :           1584 :     return planstate_tree_walker(planstate, ExecParallelReportInstrumentation,
                               1390                 :                :                                  instrumentation);
                               1391                 :                : }
                               1392                 :                : 
                               1393                 :                : /*
                               1394                 :                :  * Initialize the PlanState and its descendants with the information
                               1395                 :                :  * retrieved from shared memory.  This has to be done once the PlanState
                               1396                 :                :  * is allocated and initialized by executor; that is, after ExecutorStart().
                               1397                 :                :  */
                               1398                 :                : static bool
 3092 andres@anarazel.de       1399                 :           8149 : ExecParallelInitializeWorker(PlanState *planstate, ParallelWorkerContext *pwcxt)
                               1400                 :                : {
 3828 rhaas@postgresql.org     1401         [ -  + ]:           8149 :     if (planstate == NULL)
 3828 rhaas@postgresql.org     1402                 :UBC           0 :         return false;
                               1403                 :                : 
 3171 rhaas@postgresql.org     1404   [ +  +  +  +  :CBC        8149 :     switch (nodeTag(planstate))
                                     -  +  +  -  +  
                                     +  +  +  -  +  
                                              +  + ]
                               1405                 :                :     {
                               1406                 :           3749 :         case T_SeqScanState:
                               1407         [ +  + ]:           3749 :             if (planstate->plan->parallel_aware)
 3092 andres@anarazel.de       1408                 :           2971 :                 ExecSeqScanInitializeWorker((SeqScanState *) planstate, pwcxt);
                               1409                 :                :             /* even when not parallel-aware, for EXPLAIN ANALYZE */
   28 tomas.vondra@postgre     1410                 :GNC        3749 :             ExecSeqScanInstrumentInitWorker((SeqScanState *) planstate, pwcxt);
 3171 rhaas@postgresql.org     1411                 :CBC        3749 :             break;
                               1412                 :            424 :         case T_IndexScanState:
   29 melanieplageman@gmai     1413         [ +  + ]:GNC         424 :             if (planstate->plan->parallel_aware)
                               1414                 :             80 :                 ExecIndexScanInitializeWorker((IndexScanState *) planstate,
                               1415                 :                :                                               pwcxt);
                               1416                 :                :             /* even when not parallel-aware, for EXPLAIN ANALYZE */
                               1417                 :            424 :             ExecIndexScanInstrumentInitWorker((IndexScanState *) planstate,
                               1418                 :                :                                               pwcxt);
 3171 rhaas@postgresql.org     1419                 :CBC         424 :             break;
                               1420                 :            168 :         case T_IndexOnlyScanState:
   29 melanieplageman@gmai     1421         [ +  + ]:GNC         168 :             if (planstate->plan->parallel_aware)
                               1422                 :            136 :                 ExecIndexOnlyScanInitializeWorker((IndexOnlyScanState *) planstate,
                               1423                 :                :                                                   pwcxt);
                               1424                 :                :             /* even when not parallel-aware, for EXPLAIN ANALYZE */
                               1425                 :            168 :             ExecIndexOnlyScanInstrumentInitWorker((IndexOnlyScanState *) planstate,
                               1426                 :                :                                                   pwcxt);
  420 pg@bowt.ie               1427                 :CBC         168 :             break;
                               1428                 :            181 :         case T_BitmapIndexScanState:
                               1429                 :                :             /* even when not parallel-aware, for EXPLAIN ANALYZE */
                               1430                 :            181 :             ExecBitmapIndexScanInitializeWorker((BitmapIndexScanState *) planstate,
                               1431                 :                :                                                 pwcxt);
 3171 rhaas@postgresql.org     1432                 :            181 :             break;
 3171 rhaas@postgresql.org     1433                 :UBC           0 :         case T_ForeignScanState:
                               1434         [ #  # ]:              0 :             if (planstate->plan->parallel_aware)
 3744                          1435                 :              0 :                 ExecForeignScanInitializeWorker((ForeignScanState *) planstate,
                               1436                 :                :                                                 pwcxt);
 3171                          1437                 :              0 :             break;
  159 drowley@postgresql.o     1438                 :GNC          64 :         case T_TidRangeScanState:
                               1439         [ +  - ]:             64 :             if (planstate->plan->parallel_aware)
                               1440                 :             64 :                 ExecTidRangeScanInitializeWorker((TidRangeScanState *) planstate,
                               1441                 :                :                                                  pwcxt);
                               1442                 :                :             /* even when not parallel-aware, for EXPLAIN ANALYZE */
   28 tomas.vondra@postgre     1443                 :             64 :             ExecTidRangeScanInstrumentInitWorker((TidRangeScanState *) planstate,
                               1444                 :                :                                                  pwcxt);
  159 drowley@postgresql.o     1445                 :             64 :             break;
 3073 rhaas@postgresql.org     1446                 :CBC         298 :         case T_AppendState:
                               1447         [ +  + ]:            298 :             if (planstate->plan->parallel_aware)
                               1448                 :            242 :                 ExecAppendInitializeWorker((AppendState *) planstate, pwcxt);
                               1449                 :            298 :             break;
 3171 rhaas@postgresql.org     1450                 :UBC           0 :         case T_CustomScanState:
                               1451         [ #  # ]:              0 :             if (planstate->plan->parallel_aware)
 3744                          1452                 :              0 :                 ExecCustomScanInitializeWorker((CustomScanState *) planstate,
                               1453                 :                :                                                pwcxt);
 3171                          1454                 :              0 :             break;
 3171 rhaas@postgresql.org     1455                 :CBC         181 :         case T_BitmapHeapScanState:
                               1456         [ +  + ]:            181 :             if (planstate->plan->parallel_aware)
 3092 andres@anarazel.de       1457                 :            180 :                 ExecBitmapHeapInitializeWorker((BitmapHeapScanState *) planstate,
                               1458                 :                :                                                pwcxt);
                               1459                 :                :             /* even when not parallel-aware, for EXPLAIN ANALYZE */
   28 tomas.vondra@postgre     1460                 :GNC         181 :             ExecBitmapHeapInstrumentInitWorker((BitmapHeapScanState *) planstate,
                               1461                 :                :                                                pwcxt);
 3171 rhaas@postgresql.org     1462                 :CBC         181 :             break;
 3058 andres@anarazel.de       1463                 :            524 :         case T_HashJoinState:
                               1464         [ +  + ]:            524 :             if (planstate->plan->parallel_aware)
                               1465                 :            212 :                 ExecHashJoinInitializeWorker((HashJoinState *) planstate,
                               1466                 :                :                                              pwcxt);
                               1467                 :            524 :             break;
 3073                          1468                 :            524 :         case T_HashState:
                               1469                 :                :             /* even when not parallel-aware, for EXPLAIN ANALYZE */
                               1470                 :            524 :             ExecHashInitializeWorker((HashState *) planstate, pwcxt);
                               1471                 :            524 :             break;
 3171 rhaas@postgresql.org     1472                 :            491 :         case T_SortState:
                               1473                 :                :             /* even when not parallel-aware, for EXPLAIN ANALYZE */
 3092 andres@anarazel.de       1474                 :            491 :             ExecSortInitializeWorker((SortState *) planstate, pwcxt);
 3170 tgl@sss.pgh.pa.us        1475                 :            491 :             break;
 2220 tomas.vondra@postgre     1476                 :UBC           0 :         case T_IncrementalSortState:
                               1477                 :                :             /* even when not parallel-aware, for EXPLAIN ANALYZE */
                               1478                 :              0 :             ExecIncrementalSortInitializeWorker((IncrementalSortState *) planstate,
                               1479                 :                :                                                 pwcxt);
                               1480                 :              0 :             break;
 2146 drowley@postgresql.o     1481                 :CBC        1107 :         case T_AggState:
                               1482                 :                :             /* even when not parallel-aware, for EXPLAIN ANALYZE */
                               1483                 :           1107 :             ExecAggInitializeWorker((AggState *) planstate, pwcxt);
                               1484                 :           1107 :             break;
 1756                          1485                 :              8 :         case T_MemoizeState:
                               1486                 :                :             /* even when not parallel-aware, for EXPLAIN ANALYZE */
                               1487                 :              8 :             ExecMemoizeInitializeWorker((MemoizeState *) planstate, pwcxt);
 1859                          1488                 :              8 :             break;
 3171 rhaas@postgresql.org     1489                 :            430 :         default:
                               1490                 :            430 :             break;
                               1491                 :                :     }
                               1492                 :                : 
 3092 andres@anarazel.de       1493                 :           8149 :     return planstate_tree_walker(planstate, ExecParallelInitializeWorker,
                               1494                 :                :                                  pwcxt);
                               1495                 :                : }
                               1496                 :                : 
                               1497                 :                : /*
                               1498                 :                :  * Main entrypoint for parallel query worker processes.
                               1499                 :                :  *
                               1500                 :                :  * We reach this function from ParallelWorkerMain, so the setup necessary to
                               1501                 :                :  * create a sensible parallel environment has already been done;
                               1502                 :                :  * ParallelWorkerMain worries about stuff like the transaction state, combo
                               1503                 :                :  * CID mappings, and GUC values, so we don't need to deal with any of that
                               1504                 :                :  * here.
                               1505                 :                :  *
                               1506                 :                :  * Our job is to deal with concerns specific to the executor.  The parallel
                               1507                 :                :  * group leader will have stored a serialized PlannedStmt, and it's our job
                               1508                 :                :  * to execute that plan and write the resulting tuples to the appropriate
                               1509                 :                :  * tuple queue.  Various bits of supporting information that we need in order
                               1510                 :                :  * to do this are also stored in the dsm_segment and can be accessed through
                               1511                 :                :  * the shm_toc.
                               1512                 :                :  */
                               1513                 :                : void
 3872 rhaas@postgresql.org     1514                 :           1816 : ParallelQueryMain(dsm_segment *seg, shm_toc *toc)
                               1515                 :                : {
                               1516                 :                :     FixedParallelExecutorState *fpes;
                               1517                 :                :     BufferUsage *buffer_usage;
                               1518                 :                :     WalUsage   *wal_usage;
                               1519                 :                :     DestReceiver *receiver;
                               1520                 :                :     QueryDesc  *queryDesc;
                               1521                 :                :     SharedExecutorInstrumentation *instrumentation;
                               1522                 :                :     SharedJitInstrumentation *jit_instrumentation;
                               1523                 :           1816 :     int         instrument_options = 0;
                               1524                 :                :     void       *area_space;
                               1525                 :                :     dsa_area   *area;
                               1526                 :                :     ParallelWorkerContext pwcxt;
                               1527                 :                : 
                               1528                 :                :     /* Get fixed-size state. */
 3171                          1529                 :           1816 :     fpes = shm_toc_lookup(toc, PARALLEL_KEY_EXECUTOR_FIXED, false);
                               1530                 :                : 
                               1531                 :                :     /* Set up DestReceiver, SharedExecutorInstrumentation, and QueryDesc. */
 3872                          1532                 :           1816 :     receiver = ExecParallelGetReceiver(seg, toc);
 3256 tgl@sss.pgh.pa.us        1533                 :           1816 :     instrumentation = shm_toc_lookup(toc, PARALLEL_KEY_INSTRUMENTATION, true);
 3872 rhaas@postgresql.org     1534         [ +  + ]:           1816 :     if (instrumentation != NULL)
                               1535                 :            484 :         instrument_options = instrumentation->instrument_options;
 2779 andres@anarazel.de       1536                 :           1816 :     jit_instrumentation = shm_toc_lookup(toc, PARALLEL_KEY_JIT_INSTRUMENTATION,
                               1537                 :                :                                          true);
 3872 rhaas@postgresql.org     1538                 :           1816 :     queryDesc = ExecParallelGetQueryDesc(toc, receiver, instrument_options);
                               1539                 :                : 
                               1540                 :                :     /* Setting debug_query_string for individual workers */
 3359                          1541                 :           1816 :     debug_query_string = queryDesc->sourceText;
                               1542                 :                : 
                               1543                 :                :     /* Report workers' query for monitoring purposes */
                               1544                 :           1816 :     pgstat_report_activity(STATE_RUNNING, debug_query_string);
                               1545                 :                : 
                               1546                 :                :     /* Attach to the dynamic shared memory area. */
 3256 tgl@sss.pgh.pa.us        1547                 :           1816 :     area_space = shm_toc_lookup(toc, PARALLEL_KEY_DSA, false);
 3424 rhaas@postgresql.org     1548                 :           1816 :     area = dsa_attach_in_place(area_space, seg);
                               1549                 :                : 
                               1550                 :                :     /* Start up the executor */
 2966 andres@anarazel.de       1551                 :           1816 :     queryDesc->plannedstmt->jitFlags = fpes->jit_flags;
  348 amitlan@postgresql.o     1552                 :           1816 :     ExecutorStart(queryDesc, fpes->eflags);
                               1553                 :                : 
                               1554                 :                :     /* Special executor initialization steps for parallel workers */
 3424 rhaas@postgresql.org     1555                 :           1816 :     queryDesc->planstate->state->es_query_dsa = area;
 3092                          1556         [ +  + ]:           1816 :     if (DsaPointerIsValid(fpes->param_exec))
                               1557                 :                :     {
                               1558                 :                :         char       *paramexec_space;
                               1559                 :                : 
                               1560                 :             48 :         paramexec_space = dsa_get_address(area, fpes->param_exec);
                               1561                 :             48 :         RestoreParamExecParams(paramexec_space, queryDesc->estate);
                               1562                 :                :     }
      andres@anarazel.de       1563                 :           1816 :     pwcxt.toc = toc;
                               1564                 :           1816 :     pwcxt.seg = seg;
                               1565                 :           1816 :     ExecParallelInitializeWorker(queryDesc->planstate, &pwcxt);
                               1566                 :                : 
                               1567                 :                :     /* Pass down any tuple bound */
 3171 rhaas@postgresql.org     1568                 :           1816 :     ExecSetTupleBound(fpes->tuples_needed, queryDesc->planstate);
                               1569                 :                : 
                               1570                 :                :     /*
                               1571                 :                :      * Prepare to track buffer/WAL usage during query execution.
                               1572                 :                :      *
                               1573                 :                :      * We do this after starting up the executor to match what happens in the
                               1574                 :                :      * leader, which also doesn't count buffer accesses and WAL activity that
                               1575                 :                :      * occur during executor startup.
                               1576                 :                :      */
 2832 akapila@postgresql.o     1577                 :           1816 :     InstrStartParallelQuery();
                               1578                 :                : 
                               1579                 :                :     /*
                               1580                 :                :      * Run the plan.  If we specified a tuple bound, be careful not to demand
                               1581                 :                :      * more tuples than that.
                               1582                 :                :      */
 3171 rhaas@postgresql.org     1583                 :           1816 :     ExecutorRun(queryDesc,
                               1584                 :                :                 ForwardScanDirection,
  512 tgl@sss.pgh.pa.us        1585                 :           1816 :                 fpes->tuples_needed < 0 ? (int64) 0 : fpes->tuples_needed);
                               1586                 :                : 
                               1587                 :                :     /* Shut down the executor */
 3872 rhaas@postgresql.org     1588                 :           1808 :     ExecutorFinish(queryDesc);
                               1589                 :                : 
                               1590                 :                :     /* Report buffer/WAL usage during parallel execution. */
 3256 tgl@sss.pgh.pa.us        1591                 :           1808 :     buffer_usage = shm_toc_lookup(toc, PARALLEL_KEY_BUFFER_USAGE, false);
 2222 akapila@postgresql.o     1592                 :           1808 :     wal_usage = shm_toc_lookup(toc, PARALLEL_KEY_WAL_USAGE, false);
                               1593                 :           1808 :     InstrEndParallelQuery(&buffer_usage[ParallelWorkerNumber],
                               1594                 :           1808 :                           &wal_usage[ParallelWorkerNumber]);
                               1595                 :                : 
                               1596                 :                :     /* Report instrumentation data if any instrumentation options are set. */
 3872 rhaas@postgresql.org     1597         [ +  + ]:           1808 :     if (instrumentation != NULL)
                               1598                 :            484 :         ExecParallelReportInstrumentation(queryDesc->planstate,
                               1599                 :                :                                           instrumentation);
                               1600                 :                : 
                               1601                 :                :     /* Report JIT instrumentation data if any */
 2779 andres@anarazel.de       1602   [ -  +  -  - ]:           1808 :     if (queryDesc->estate->es_jit && jit_instrumentation != NULL)
                               1603                 :                :     {
 2779 andres@anarazel.de       1604         [ #  # ]:UBC           0 :         Assert(ParallelWorkerNumber < jit_instrumentation->num_workers);
                               1605                 :              0 :         jit_instrumentation->jit_instr[ParallelWorkerNumber] =
                               1606                 :              0 :             queryDesc->estate->es_jit->instr;
                               1607                 :                :     }
                               1608                 :                : 
                               1609                 :                :     /* Must do this after capturing instrumentation. */
 3870 rhaas@postgresql.org     1610                 :CBC        1808 :     ExecutorEnd(queryDesc);
                               1611                 :                : 
                               1612                 :                :     /* Cleanup. */
 3424                          1613                 :           1808 :     dsa_detach(area);
 3872                          1614                 :           1808 :     FreeQueryDesc(queryDesc);
 3162 peter_e@gmx.net          1615                 :           1808 :     receiver->rDestroy(receiver);
 3872 rhaas@postgresql.org     1616                 :           1808 : }
        

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