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1 : : /*-------------------------------------------------------------------------
2 : : *
3 : : * functions.c
4 : : * Execution of SQL-language functions
5 : : *
6 : : * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
7 : : * Portions Copyright (c) 1994, Regents of the University of California
8 : : *
9 : : *
10 : : * IDENTIFICATION
11 : : * src/backend/executor/functions.c
12 : : *
13 : : *-------------------------------------------------------------------------
14 : : */
15 : : #include "postgres.h"
16 : :
17 : : #include "access/htup_details.h"
18 : : #include "access/xact.h"
19 : : #include "catalog/pg_proc.h"
20 : : #include "catalog/pg_type.h"
21 : : #include "executor/functions.h"
22 : : #include "funcapi.h"
23 : : #include "miscadmin.h"
24 : : #include "nodes/makefuncs.h"
25 : : #include "nodes/nodeFuncs.h"
26 : : #include "parser/parse_coerce.h"
27 : : #include "parser/parse_collate.h"
28 : : #include "parser/parse_func.h"
29 : : #include "rewrite/rewriteHandler.h"
30 : : #include "storage/proc.h"
31 : : #include "tcop/utility.h"
32 : : #include "utils/builtins.h"
33 : : #include "utils/datum.h"
34 : : #include "utils/funccache.h"
35 : : #include "utils/lsyscache.h"
36 : : #include "utils/memutils.h"
37 : : #include "utils/plancache.h"
38 : : #include "utils/snapmgr.h"
39 : : #include "utils/syscache.h"
40 : : #include "utils/tuplestore.h"
41 : :
42 : :
43 : : /*
44 : : * Specialized DestReceiver for collecting query output in a SQL function
45 : : */
46 : : typedef struct
47 : : {
48 : : DestReceiver pub; /* publicly-known function pointers */
49 : : Tuplestorestate *tstore; /* where to put result tuples, or NULL */
50 : : JunkFilter *filter; /* filter to convert tuple type */
51 : : } DR_sqlfunction;
52 : :
53 : : /*
54 : : * We have an execution_state record for each query in a function. Each
55 : : * record references a plantree for its query. If the query is currently in
56 : : * F_EXEC_RUN state then there's a QueryDesc too.
57 : : *
58 : : * The "next" fields chain together all the execution_state records generated
59 : : * from a single original parsetree. (There will only be more than one in
60 : : * case of rule expansion of the original parsetree.) The chain structure is
61 : : * quite vestigial at this point, because we allocate the records in an array
62 : : * for ease of memory management. But we'll get rid of it some other day.
63 : : */
64 : : typedef enum
65 : : {
66 : : F_EXEC_START, F_EXEC_RUN, F_EXEC_DONE,
67 : : } ExecStatus;
68 : :
69 : : typedef struct execution_state
70 : : {
71 : : struct execution_state *next;
72 : : ExecStatus status;
73 : : bool setsResult; /* true if this query produces func's result */
74 : : bool lazyEval; /* true if should fetch one row at a time */
75 : : PlannedStmt *stmt; /* plan for this query */
76 : : QueryDesc *qd; /* null unless status == RUN */
77 : : } execution_state;
78 : :
79 : :
80 : : /*
81 : : * Data associated with a SQL-language function is kept in two main
82 : : * data structures:
83 : : *
84 : : * 1. SQLFunctionHashEntry is a long-lived (potentially session-lifespan)
85 : : * struct that holds all the info we need out of the function's pg_proc row.
86 : : * In addition it holds pointers to CachedPlanSource(s) that manage creation
87 : : * of plans for the query(s) within the function. A SQLFunctionHashEntry is
88 : : * potentially shared across multiple concurrent executions of the function,
89 : : * so it must contain no execution-specific state; but its use_count must
90 : : * reflect the number of SQLFunctionCache structs pointing at it.
91 : : * If the function's pg_proc row is updated, we throw away and regenerate
92 : : * the SQLFunctionHashEntry and subsidiary data. (Also note that if the
93 : : * function is polymorphic or used as a trigger, there is a separate
94 : : * SQLFunctionHashEntry for each usage, so that we need consider only one
95 : : * set of relevant data types.) The struct itself is in memory managed by
96 : : * funccache.c, and its subsidiary data is kept in one of two contexts:
97 : : * * pcontext ("parse context") holds the raw parse trees or Query trees
98 : : * that we read from the pg_proc row. These will be converted to
99 : : * CachedPlanSources as they are needed. Once the last one is converted,
100 : : * pcontext can be freed.
101 : : * * hcontext ("hash context") holds everything else belonging to the
102 : : * SQLFunctionHashEntry.
103 : : *
104 : : * 2. SQLFunctionCache is subsidiary data for a single FmgrInfo struct.
105 : : * It is pointed to by the fn_extra field of the FmgrInfo struct, and is
106 : : * always allocated in the FmgrInfo's fn_mcxt. It holds a reference to
107 : : * the CachedPlan for the current query, and other execution-specific data.
108 : : * A few subsidiary items such as the ParamListInfo object are also kept
109 : : * directly in fn_mcxt (which is also called fcontext here). But most
110 : : * subsidiary data is in jfcontext or subcontext.
111 : : */
112 : :
113 : : typedef struct SQLFunctionHashEntry
114 : : {
115 : : CachedFunction cfunc; /* fields managed by funccache.c */
116 : :
117 : : char *fname; /* function name (for error msgs) */
118 : : char *src; /* function body text (for error msgs) */
119 : :
120 : : SQLFunctionParseInfoPtr pinfo; /* data for parser callback hooks */
121 : : int16 *argtyplen; /* lengths of the input argument types */
122 : :
123 : : Oid rettype; /* actual return type */
124 : : int16 typlen; /* length of the return type */
125 : : bool typbyval; /* true if return type is pass by value */
126 : : bool returnsSet; /* true if returning multiple rows */
127 : : bool returnsTuple; /* true if returning whole tuple result */
128 : : bool readonly_func; /* true to run in "read only" mode */
129 : : char prokind; /* prokind from pg_proc row */
130 : :
131 : : TupleDesc rettupdesc; /* result tuple descriptor */
132 : :
133 : : List *source_list; /* RawStmts or Queries read from pg_proc */
134 : : int num_queries; /* original length of source_list */
135 : : bool raw_source; /* true if source_list contains RawStmts */
136 : :
137 : : List *plansource_list; /* CachedPlanSources for fn's queries */
138 : :
139 : : MemoryContext pcontext; /* memory context holding source_list */
140 : : MemoryContext hcontext; /* memory context holding all else */
141 : : } SQLFunctionHashEntry;
142 : :
143 : : typedef struct SQLFunctionCache
144 : : {
145 : : SQLFunctionHashEntry *func; /* associated SQLFunctionHashEntry */
146 : :
147 : : bool active; /* are we executing this cache entry? */
148 : : bool lazyEvalOK; /* true if lazyEval is safe */
149 : : bool shutdown_reg; /* true if registered shutdown callback */
150 : : bool lazyEval; /* true if using lazyEval for result query */
151 : : bool randomAccess; /* true if tstore needs random access */
152 : : bool ownSubcontext; /* is subcontext really a separate context? */
153 : :
154 : : ParamListInfo paramLI; /* Param list representing current args */
155 : :
156 : : Tuplestorestate *tstore; /* where we accumulate result for a SRF */
157 : : MemoryContext tscontext; /* memory context that tstore should be in */
158 : :
159 : : JunkFilter *junkFilter; /* will be NULL if function returns VOID */
160 : : int jf_generation; /* tracks whether junkFilter is up-to-date */
161 : :
162 : : /*
163 : : * While executing a particular query within the function, cplan is the
164 : : * CachedPlan we've obtained for that query, and eslist is a chain of
165 : : * execution_state records for the individual plans within the CachedPlan.
166 : : * If eslist is not NULL at entry to fmgr_sql, then we are resuming
167 : : * execution of a lazyEval-mode set-returning function.
168 : : *
169 : : * next_query_index is the 0-based index of the next CachedPlanSource to
170 : : * get a CachedPlan from.
171 : : */
172 : : CachedPlan *cplan; /* Plan for current query, if any */
173 : : ResourceOwner cowner; /* CachedPlan is registered with this owner */
174 : : int next_query_index; /* index of next CachedPlanSource to run */
175 : :
176 : : execution_state *eslist; /* chain of execution_state records */
177 : : execution_state *esarray; /* storage for eslist */
178 : : int esarray_len; /* allocated length of esarray[] */
179 : :
180 : : /* if positive, this is the 1-based index of the query we're processing */
181 : : int error_query_index;
182 : :
183 : : MemoryContext fcontext; /* memory context holding this struct and all
184 : : * subsidiary data */
185 : : MemoryContext jfcontext; /* subsidiary memory context holding
186 : : * junkFilter, result slot, and related data */
187 : : MemoryContext subcontext; /* subsidiary memory context for sub-executor */
188 : :
189 : : /* Callback to release our use-count on the SQLFunctionHashEntry */
190 : : MemoryContextCallback mcb;
191 : : } SQLFunctionCache;
192 : :
193 : : typedef SQLFunctionCache *SQLFunctionCachePtr;
194 : :
195 : :
196 : : /* non-export function prototypes */
197 : : static Node *sql_fn_param_ref(ParseState *pstate, ParamRef *pref);
198 : : static Node *sql_fn_post_column_ref(ParseState *pstate,
199 : : ColumnRef *cref, Node *var);
200 : : static Node *sql_fn_make_param(SQLFunctionParseInfoPtr pinfo,
201 : : int paramno, int location);
202 : : static Node *sql_fn_resolve_param_name(SQLFunctionParseInfoPtr pinfo,
203 : : const char *paramname, int location);
204 : : static SQLFunctionCache *init_sql_fcache(FunctionCallInfo fcinfo,
205 : : bool lazyEvalOK);
206 : : static bool init_execution_state(SQLFunctionCachePtr fcache);
207 : : static void prepare_next_query(SQLFunctionHashEntry *func);
208 : : static void sql_compile_callback(FunctionCallInfo fcinfo,
209 : : HeapTuple procedureTuple,
210 : : const CachedFunctionHashKey *hashkey,
211 : : CachedFunction *cfunc,
212 : : bool forValidator);
213 : : static void sql_delete_callback(CachedFunction *cfunc);
214 : : static void sql_postrewrite_callback(List *querytree_list, void *arg);
215 : : static void postquel_start(execution_state *es, SQLFunctionCachePtr fcache);
216 : : static bool postquel_getnext(execution_state *es, SQLFunctionCachePtr fcache);
217 : : static void postquel_end(execution_state *es, SQLFunctionCachePtr fcache);
218 : : static void postquel_sub_params(SQLFunctionCachePtr fcache,
219 : : FunctionCallInfo fcinfo);
220 : : static Datum postquel_get_single_result(TupleTableSlot *slot,
221 : : FunctionCallInfo fcinfo,
222 : : SQLFunctionCachePtr fcache);
223 : : static void sql_compile_error_callback(void *arg);
224 : : static void sql_exec_error_callback(void *arg);
225 : : static void ShutdownSQLFunction(Datum arg);
226 : : static void RemoveSQLFunctionCache(void *arg);
227 : : static void check_sql_fn_statement(List *queryTreeList);
228 : : static bool check_sql_stmt_retval(List *queryTreeList,
229 : : Oid rettype, TupleDesc rettupdesc,
230 : : char prokind, bool insertDroppedCols);
231 : : static bool coerce_fn_result_column(TargetEntry *src_tle,
232 : : Oid res_type, int32 res_typmod,
233 : : bool tlist_is_modifiable,
234 : : List **upper_tlist,
235 : : bool *upper_tlist_nontrivial);
236 : : static List *get_sql_fn_result_tlist(List *queryTreeList);
237 : : static void sqlfunction_startup(DestReceiver *self, int operation, TupleDesc typeinfo);
238 : : static bool sqlfunction_receive(TupleTableSlot *slot, DestReceiver *self);
239 : : static void sqlfunction_shutdown(DestReceiver *self);
240 : : static void sqlfunction_destroy(DestReceiver *self);
241 : :
242 : :
243 : : /*
244 : : * Prepare the SQLFunctionParseInfo struct for parsing a SQL function body
245 : : *
246 : : * This includes resolving actual types of polymorphic arguments.
247 : : *
248 : : * call_expr can be passed as NULL, but then we will fail if there are any
249 : : * polymorphic arguments.
250 : : */
251 : : SQLFunctionParseInfoPtr
5521 tgl@sss.pgh.pa.us 252 :CBC 5279 : prepare_sql_fn_parse_info(HeapTuple procedureTuple,
253 : : Node *call_expr,
254 : : Oid inputCollation)
255 : : {
256 : : SQLFunctionParseInfoPtr pinfo;
257 : 5279 : Form_pg_proc procedureStruct = (Form_pg_proc) GETSTRUCT(procedureTuple);
258 : : int nargs;
259 : :
146 michael@paquier.xyz 260 :GNC 5279 : pinfo = (SQLFunctionParseInfoPtr) palloc0_object(SQLFunctionParseInfo);
261 : :
262 : : /* Function's name (only) can be used to qualify argument names */
5204 tgl@sss.pgh.pa.us 263 :CBC 5279 : pinfo->fname = pstrdup(NameStr(procedureStruct->proname));
264 : :
265 : : /* Save the function's input collation */
5521 266 : 5279 : pinfo->collation = inputCollation;
267 : :
268 : : /*
269 : : * Copy input argument types from the pg_proc entry, then resolve any
270 : : * polymorphic types.
271 : : */
272 : 5279 : pinfo->nargs = nargs = procedureStruct->pronargs;
273 [ + + ]: 5279 : if (nargs > 0)
274 : : {
275 : : Oid *argOidVect;
276 : : int argnum;
277 : :
278 : 4392 : argOidVect = (Oid *) palloc(nargs * sizeof(Oid));
279 : 4392 : memcpy(argOidVect,
280 : 4392 : procedureStruct->proargtypes.values,
281 : : nargs * sizeof(Oid));
282 : :
283 [ + + ]: 11732 : for (argnum = 0; argnum < nargs; argnum++)
284 : : {
285 : 7340 : Oid argtype = argOidVect[argnum];
286 : :
287 [ + + + + : 7340 : if (IsPolymorphicType(argtype))
+ + + - +
+ + + + +
+ + + + +
+ + + ]
288 : : {
289 : 2123 : argtype = get_call_expr_argtype(call_expr, argnum);
290 [ - + ]: 2123 : if (argtype == InvalidOid)
5521 tgl@sss.pgh.pa.us 291 [ # # ]:UBC 0 : ereport(ERROR,
292 : : (errcode(ERRCODE_DATATYPE_MISMATCH),
293 : : errmsg("could not determine actual type of argument declared %s",
294 : : format_type_be(argOidVect[argnum]))));
5521 tgl@sss.pgh.pa.us 295 :CBC 2123 : argOidVect[argnum] = argtype;
296 : : }
297 : : }
298 : :
299 : 4392 : pinfo->argtypes = argOidVect;
300 : : }
301 : :
302 : : /*
303 : : * Collect names of arguments, too, if any
304 : : */
5204 305 [ + + ]: 5279 : if (nargs > 0)
306 : : {
307 : : Datum proargnames;
308 : : Datum proargmodes;
309 : : int n_arg_names;
310 : : bool isNull;
311 : :
312 : 4392 : proargnames = SysCacheGetAttr(PROCNAMEARGSNSP, procedureTuple,
313 : : Anum_pg_proc_proargnames,
314 : : &isNull);
315 [ + + ]: 4392 : if (isNull)
3240 316 : 2882 : proargnames = PointerGetDatum(NULL); /* just to be sure */
317 : :
5204 318 : 4392 : proargmodes = SysCacheGetAttr(PROCNAMEARGSNSP, procedureTuple,
319 : : Anum_pg_proc_proargmodes,
320 : : &isNull);
321 [ + + ]: 4392 : if (isNull)
3240 322 : 3899 : proargmodes = PointerGetDatum(NULL); /* just to be sure */
323 : :
1790 324 : 4392 : n_arg_names = get_func_input_arg_names(proargnames, proargmodes,
325 : : &pinfo->argnames);
326 : :
327 : : /* Paranoia: ignore the result if too few array entries */
5204 328 [ + + ]: 4392 : if (n_arg_names < nargs)
329 : 2882 : pinfo->argnames = NULL;
330 : : }
331 : : else
332 : 887 : pinfo->argnames = NULL;
333 : :
5521 334 : 5279 : return pinfo;
335 : : }
336 : :
337 : : /*
338 : : * Parser setup hook for parsing a SQL function body.
339 : : */
340 : : void
341 : 8039 : sql_fn_parser_setup(struct ParseState *pstate, SQLFunctionParseInfoPtr pinfo)
342 : : {
343 : 8039 : pstate->p_pre_columnref_hook = NULL;
5204 344 : 8039 : pstate->p_post_columnref_hook = sql_fn_post_column_ref;
5521 345 : 8039 : pstate->p_paramref_hook = sql_fn_param_ref;
346 : : /* no need to use p_coerce_param_hook */
523 peter@eisentraut.org 347 : 8039 : pstate->p_ref_hook_state = pinfo;
5521 tgl@sss.pgh.pa.us 348 : 8039 : }
349 : :
350 : : /*
351 : : * sql_fn_post_column_ref parser callback for ColumnRefs
352 : : */
353 : : static Node *
5204 354 : 6216 : sql_fn_post_column_ref(ParseState *pstate, ColumnRef *cref, Node *var)
355 : : {
356 : 6216 : SQLFunctionParseInfoPtr pinfo = (SQLFunctionParseInfoPtr) pstate->p_ref_hook_state;
357 : : int nnames;
358 : : Node *field1;
359 : 6216 : Node *subfield = NULL;
360 : : const char *name1;
361 : 6216 : const char *name2 = NULL;
362 : : Node *param;
363 : :
364 : : /*
365 : : * Never override a table-column reference. This corresponds to
366 : : * considering the parameter names to appear in a scope outside the
367 : : * individual SQL commands, which is what we want.
368 : : */
369 [ + + ]: 6216 : if (var != NULL)
370 : 4973 : return NULL;
371 : :
372 : : /*----------
373 : : * The allowed syntaxes are:
374 : : *
375 : : * A A = parameter name
376 : : * A.B A = function name, B = parameter name
377 : : * OR: A = record-typed parameter name, B = field name
378 : : * (the first possibility takes precedence)
379 : : * A.B.C A = function name, B = record-typed parameter name,
380 : : * C = field name
381 : : * A.* Whole-row reference to composite parameter A.
382 : : * A.B.* Same, with A = function name, B = parameter name
383 : : *
384 : : * Here, it's sufficient to ignore the "*" in the last two cases --- the
385 : : * main parser will take care of expanding the whole-row reference.
386 : : *----------
387 : : */
388 : 1243 : nnames = list_length(cref->fields);
389 : :
390 [ - + ]: 1243 : if (nnames > 3)
5204 tgl@sss.pgh.pa.us 391 :UBC 0 : return NULL;
392 : :
4474 tgl@sss.pgh.pa.us 393 [ + + ]:CBC 1243 : if (IsA(llast(cref->fields), A_Star))
394 : 32 : nnames--;
395 : :
5204 396 : 1243 : field1 = (Node *) linitial(cref->fields);
397 : 1243 : name1 = strVal(field1);
398 [ + + ]: 1243 : if (nnames > 1)
399 : : {
400 : 116 : subfield = (Node *) lsecond(cref->fields);
401 : 116 : name2 = strVal(subfield);
402 : : }
403 : :
404 [ + + ]: 1243 : if (nnames == 3)
405 : : {
406 : : /*
407 : : * Three-part name: if the first part doesn't match the function name,
408 : : * we can fail immediately. Otherwise, look up the second part, and
409 : : * take the third part to be a field reference.
410 : : */
411 [ - + ]: 16 : if (strcmp(name1, pinfo->fname) != 0)
5204 tgl@sss.pgh.pa.us 412 :UBC 0 : return NULL;
413 : :
5204 tgl@sss.pgh.pa.us 414 :CBC 16 : param = sql_fn_resolve_param_name(pinfo, name2, cref->location);
415 : :
416 : 16 : subfield = (Node *) lthird(cref->fields);
417 [ - + ]: 16 : Assert(IsA(subfield, String));
418 : : }
419 [ + + + + ]: 1227 : else if (nnames == 2 && strcmp(name1, pinfo->fname) == 0)
420 : : {
421 : : /*
422 : : * Two-part name with first part matching function name: first see if
423 : : * second part matches any parameter name.
424 : : */
425 : 17 : param = sql_fn_resolve_param_name(pinfo, name2, cref->location);
426 : :
427 [ + - ]: 17 : if (param)
428 : : {
429 : : /* Yes, so this is a parameter reference, no subfield */
430 : 17 : subfield = NULL;
431 : : }
432 : : else
433 : : {
434 : : /* No, so try to match as parameter name and subfield */
5204 tgl@sss.pgh.pa.us 435 :UBC 0 : param = sql_fn_resolve_param_name(pinfo, name1, cref->location);
436 : : }
437 : : }
438 : : else
439 : : {
440 : : /* Single name, or parameter name followed by subfield */
5204 tgl@sss.pgh.pa.us 441 :CBC 1210 : param = sql_fn_resolve_param_name(pinfo, name1, cref->location);
442 : : }
443 : :
444 [ - + ]: 1243 : if (!param)
5204 tgl@sss.pgh.pa.us 445 :UBC 0 : return NULL; /* No match */
446 : :
5204 tgl@sss.pgh.pa.us 447 [ + + ]:CBC 1243 : if (subfield)
448 : : {
449 : : /*
450 : : * Must be a reference to a field of a composite parameter; otherwise
451 : : * ParseFuncOrColumn will return NULL, and we'll fail back at the
452 : : * caller.
453 : : */
454 : 99 : param = ParseFuncOrColumn(pstate,
5204 tgl@sss.pgh.pa.us 455 :ECB (66) : list_make1(subfield),
456 : (66) : list_make1(param),
457 : : pstate->p_last_srf,
458 : : NULL,
459 : : false,
460 : : cref->location);
461 : : }
462 : :
5204 tgl@sss.pgh.pa.us 463 :CBC 1243 : return param;
464 : : }
465 : :
466 : : /*
467 : : * sql_fn_param_ref parser callback for ParamRefs ($n symbols)
468 : : */
469 : : static Node *
5521 470 : 13600 : sql_fn_param_ref(ParseState *pstate, ParamRef *pref)
471 : : {
472 : 13600 : SQLFunctionParseInfoPtr pinfo = (SQLFunctionParseInfoPtr) pstate->p_ref_hook_state;
473 : 13600 : int paramno = pref->number;
474 : :
475 : : /* Check parameter number is valid */
476 [ + - + + ]: 13600 : if (paramno <= 0 || paramno > pinfo->nargs)
477 : 4 : return NULL; /* unknown parameter number */
478 : :
5204 479 : 13596 : return sql_fn_make_param(pinfo, paramno, pref->location);
480 : : }
481 : :
482 : : /*
483 : : * sql_fn_make_param construct a Param node for the given paramno
484 : : */
485 : : static Node *
486 : 14839 : sql_fn_make_param(SQLFunctionParseInfoPtr pinfo,
487 : : int paramno, int location)
488 : : {
489 : : Param *param;
490 : :
5521 491 : 14839 : param = makeNode(Param);
492 : 14839 : param->paramkind = PARAM_EXTERN;
493 : 14839 : param->paramid = paramno;
494 : 14839 : param->paramtype = pinfo->argtypes[paramno - 1];
495 : 14839 : param->paramtypmod = -1;
496 : 14839 : param->paramcollid = get_typcollation(param->paramtype);
5204 497 : 14839 : param->location = location;
498 : :
499 : : /*
500 : : * If we have a function input collation, allow it to override the
501 : : * type-derived collation for parameter symbols. (XXX perhaps this should
502 : : * not happen if the type collation is not default?)
503 : : */
5521 504 [ + + + + ]: 14839 : if (OidIsValid(pinfo->collation) && OidIsValid(param->paramcollid))
505 : 1612 : param->paramcollid = pinfo->collation;
506 : :
507 : 14839 : return (Node *) param;
508 : : }
509 : :
510 : : /*
511 : : * Search for a function parameter of the given name; if there is one,
512 : : * construct and return a Param node for it. If not, return NULL.
513 : : * Helper function for sql_fn_post_column_ref.
514 : : */
515 : : static Node *
5204 516 : 1243 : sql_fn_resolve_param_name(SQLFunctionParseInfoPtr pinfo,
517 : : const char *paramname, int location)
518 : : {
519 : : int i;
520 : :
521 [ - + ]: 1243 : if (pinfo->argnames == NULL)
5204 tgl@sss.pgh.pa.us 522 :UBC 0 : return NULL;
523 : :
5204 tgl@sss.pgh.pa.us 524 [ + - ]:CBC 1711 : for (i = 0; i < pinfo->nargs; i++)
525 : : {
526 [ + - + + ]: 1711 : if (pinfo->argnames[i] && strcmp(pinfo->argnames[i], paramname) == 0)
527 : 1243 : return sql_fn_make_param(pinfo, i + 1, location);
528 : : }
529 : :
5204 tgl@sss.pgh.pa.us 530 :UBC 0 : return NULL;
531 : : }
532 : :
533 : : /*
534 : : * Initialize the SQLFunctionCache for a SQL function
535 : : */
536 : : static SQLFunctionCache *
398 tgl@sss.pgh.pa.us 537 :CBC 50333 : init_sql_fcache(FunctionCallInfo fcinfo, bool lazyEvalOK)
538 : : {
539 : 50333 : FmgrInfo *finfo = fcinfo->flinfo;
540 : : SQLFunctionHashEntry *func;
541 : : SQLFunctionCache *fcache;
542 : :
543 : : /*
544 : : * If this is the first execution for this FmgrInfo, set up a cache struct
545 : : * (initially containing null pointers). The cache must live as long as
546 : : * the FmgrInfo, so it goes in fn_mcxt. Also set up a memory context
547 : : * callback that will be invoked when fn_mcxt is deleted.
548 : : */
383 549 : 50333 : fcache = finfo->fn_extra;
550 [ + + ]: 50333 : if (fcache == NULL)
551 : : {
552 : : fcache = (SQLFunctionCache *)
553 : 20476 : MemoryContextAllocZero(finfo->fn_mcxt, sizeof(SQLFunctionCache));
554 : 20476 : fcache->fcontext = finfo->fn_mcxt;
555 : 20476 : fcache->mcb.func = RemoveSQLFunctionCache;
556 : 20476 : fcache->mcb.arg = fcache;
557 : 20476 : MemoryContextRegisterResetCallback(finfo->fn_mcxt, &fcache->mcb);
558 : 20476 : finfo->fn_extra = fcache;
559 : : }
560 : :
561 : : /*
562 : : * If the SQLFunctionCache is marked as active, we must have errored out
563 : : * of a prior execution. Reset state. (It might seem that we could also
564 : : * reach this during recursive invocation of a SQL function, but we won't
565 : : * because that case won't involve re-use of the same FmgrInfo.)
566 : : */
258 567 [ + + ]: 50333 : if (fcache->active)
568 : : {
569 : : /*
570 : : * In general, this stanza should clear all the same fields that
571 : : * ShutdownSQLFunction would. Note we must clear fcache->cplan
572 : : * without doing ReleaseCachedPlan, because error cleanup from the
573 : : * prior execution would have taken care of releasing that plan.
574 : : * Likewise, if tstore is still set then it is pointing at garbage.
575 : : */
576 : 4 : fcache->cplan = NULL;
577 : 4 : fcache->eslist = NULL;
578 : 4 : fcache->tstore = NULL;
579 : 4 : fcache->shutdown_reg = false;
580 : 4 : fcache->active = false;
581 : : }
582 : :
583 : : /*
584 : : * If we are resuming execution of a set-returning function, just keep
585 : : * using the same cache. We do not ask funccache.c to re-validate the
586 : : * SQLFunctionHashEntry: we want to run to completion using the function's
587 : : * initial definition.
588 : : */
383 589 [ + + ]: 50333 : if (fcache->eslist != NULL)
590 : : {
591 [ - + ]: 916 : Assert(fcache->func != NULL);
592 : 916 : return fcache;
593 : : }
594 : :
595 : : /*
596 : : * Look up, or re-validate, the long-lived hash entry. Make the hash key
597 : : * depend on the result of get_call_result_type() when that's composite,
598 : : * so that we can safely assume that we'll build a new hash entry if the
599 : : * composite rowtype changes.
600 : : */
601 : : func = (SQLFunctionHashEntry *)
398 602 : 49417 : cached_function_compile(fcinfo,
383 603 : 49417 : (CachedFunction *) fcache->func,
604 : : sql_compile_callback,
605 : : sql_delete_callback,
606 : : sizeof(SQLFunctionHashEntry),
607 : : true,
608 : : false);
609 : :
610 : : /*
611 : : * Install the hash pointer in the SQLFunctionCache, and increment its use
612 : : * count to reflect that. If cached_function_compile gave us back a
613 : : * different hash entry than we were using before, we must decrement that
614 : : * one's use count.
615 : : */
616 [ + + ]: 49413 : if (func != fcache->func)
617 : : {
618 [ - + ]: 20472 : if (fcache->func != NULL)
619 : : {
383 tgl@sss.pgh.pa.us 620 [ # # ]:UBC 0 : Assert(fcache->func->cfunc.use_count > 0);
621 : 0 : fcache->func->cfunc.use_count--;
622 : : }
383 tgl@sss.pgh.pa.us 623 :CBC 20472 : fcache->func = func;
398 624 : 20472 : func->cfunc.use_count++;
625 : : /* Assume we need to rebuild the junkFilter */
383 626 : 20472 : fcache->junkFilter = NULL;
627 : : }
628 : :
629 : : /*
630 : : * We're beginning a new execution of the function, so convert params to
631 : : * appropriate format.
632 : : */
398 633 : 49413 : postquel_sub_params(fcache, fcinfo);
634 : :
635 : : /* Also reset lazyEval state for the new execution. */
383 636 : 49413 : fcache->lazyEvalOK = lazyEvalOK;
637 : 49413 : fcache->lazyEval = false;
638 : :
639 : : /* Also reset data about where we are in the function. */
640 : 49413 : fcache->eslist = NULL;
641 : 49413 : fcache->next_query_index = 0;
642 : 49413 : fcache->error_query_index = 0;
643 : :
398 644 : 49413 : return fcache;
645 : : }
646 : :
647 : : /*
648 : : * Set up the per-query execution_state records for the next query within
649 : : * the SQL function.
650 : : *
651 : : * Returns true if successful, false if there are no more queries.
652 : : */
653 : : static bool
654 : 93382 : init_execution_state(SQLFunctionCachePtr fcache)
655 : : {
656 : : CachedPlanSource *plansource;
657 : 93382 : execution_state *preves = NULL;
6395 658 : 93382 : execution_state *lasttages = NULL;
659 : : int nstmts;
660 : : ListCell *lc;
661 : :
662 : : /*
663 : : * Clean up after previous query, if there was one.
664 : : */
398 665 [ + + ]: 93382 : if (fcache->cplan)
666 : : {
667 : 43969 : ReleaseCachedPlan(fcache->cplan, fcache->cowner);
668 : 43969 : fcache->cplan = NULL;
669 : : }
670 : 93382 : fcache->eslist = NULL;
671 : :
672 : : /*
673 : : * Get the next CachedPlanSource, or stop if there are no more. We might
674 : : * need to create the next CachedPlanSource; if so, advance
675 : : * error_query_index first, so that errors detected in prepare_next_query
676 : : * are blamed on the right statement.
677 : : */
678 [ + + ]: 93382 : if (fcache->next_query_index >= list_length(fcache->func->plansource_list))
679 : : {
680 [ + + ]: 45426 : if (fcache->next_query_index >= fcache->func->num_queries)
681 : 43915 : return false;
682 : 1511 : fcache->error_query_index++;
683 : 1511 : prepare_next_query(fcache->func);
684 : : }
685 : : else
686 : 47956 : fcache->error_query_index++;
687 : :
688 : 49463 : plansource = (CachedPlanSource *) list_nth(fcache->func->plansource_list,
689 : : fcache->next_query_index);
690 : 49463 : fcache->next_query_index++;
691 : :
692 : : /*
693 : : * Generate plans for the query or queries within this CachedPlanSource.
694 : : * Register the CachedPlan with the current resource owner. (Saving
695 : : * cowner here is mostly paranoia, but this way we needn't assume that
696 : : * CurrentResourceOwner will be the same when ShutdownSQLFunction runs.)
697 : : */
698 : 49463 : fcache->cowner = CurrentResourceOwner;
699 : 49463 : fcache->cplan = GetCachedPlan(plansource,
700 : : fcache->paramLI,
701 : : fcache->cowner,
702 : : NULL);
703 : :
704 : : /*
705 : : * If necessary, make esarray[] bigger to hold the needed state.
706 : : */
383 707 : 49430 : nstmts = list_length(fcache->cplan->stmt_list);
708 [ + + ]: 49430 : if (nstmts > fcache->esarray_len)
709 : : {
710 [ + - ]: 20439 : if (fcache->esarray == NULL)
711 : 20439 : fcache->esarray = (execution_state *)
712 : 20439 : MemoryContextAlloc(fcache->fcontext,
713 : : sizeof(execution_state) * nstmts);
714 : : else
383 tgl@sss.pgh.pa.us 715 :UBC 0 : fcache->esarray = repalloc_array(fcache->esarray,
716 : : execution_state, nstmts);
383 tgl@sss.pgh.pa.us 717 :CBC 20439 : fcache->esarray_len = nstmts;
718 : : }
719 : :
720 : : /*
721 : : * Build execution_state list to match the number of contained plans.
722 : : */
398 723 [ + - + + : 98864 : foreach(lc, fcache->cplan->stmt_list)
+ + ]
724 : : {
725 : 49434 : PlannedStmt *stmt = lfirst_node(PlannedStmt, lc);
726 : : execution_state *newes;
727 : :
728 : : /*
729 : : * Precheck all commands for validity in a function. This should
730 : : * generally match the restrictions spi.c applies.
731 : : */
732 [ + + ]: 49434 : if (stmt->commandType == CMD_UTILITY)
733 : : {
734 [ - + ]: 116 : if (IsA(stmt->utilityStmt, CopyStmt) &&
398 tgl@sss.pgh.pa.us 735 [ # # ]:UBC 0 : ((CopyStmt *) stmt->utilityStmt)->filename == NULL)
736 [ # # ]: 0 : ereport(ERROR,
737 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
738 : : errmsg("cannot COPY to/from client in an SQL function")));
739 : :
398 tgl@sss.pgh.pa.us 740 [ - + ]:CBC 116 : if (IsA(stmt->utilityStmt, TransactionStmt))
5545 tgl@sss.pgh.pa.us 741 [ # # ]:UBC 0 : ereport(ERROR,
742 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
743 : : /* translator: %s is a SQL statement name */
744 : : errmsg("%s is not allowed in an SQL function",
745 : : CreateCommandName(stmt->utilityStmt))));
746 : : }
747 : :
398 tgl@sss.pgh.pa.us 748 [ + + - + ]:CBC 49434 : if (fcache->func->readonly_func && !CommandIsReadOnly(stmt))
398 tgl@sss.pgh.pa.us 749 [ # # ]:UBC 0 : ereport(ERROR,
750 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
751 : : /* translator: %s is a SQL statement name */
752 : : errmsg("%s is not allowed in a non-volatile function",
753 : : CreateCommandName((Node *) stmt))));
754 : :
755 : : /* OK, build the execution_state for this query */
383 tgl@sss.pgh.pa.us 756 :CBC 49434 : newes = &fcache->esarray[foreach_current_index(lc)];
398 757 [ + + ]: 49434 : if (preves)
758 : 4 : preves->next = newes;
759 : : else
760 : 49430 : fcache->eslist = newes;
761 : :
762 : 49434 : newes->next = NULL;
763 : 49434 : newes->status = F_EXEC_START;
764 : 49434 : newes->setsResult = false; /* might change below */
765 : 49434 : newes->lazyEval = false; /* might change below */
766 : 49434 : newes->stmt = stmt;
767 : 49434 : newes->qd = NULL;
768 : :
769 [ + + ]: 49434 : if (stmt->canSetTag)
770 : 49430 : lasttages = newes;
771 : :
772 : 49434 : preves = newes;
773 : : }
774 : :
775 : : /*
776 : : * If this isn't the last CachedPlanSource, we're done here. Otherwise,
777 : : * we need to prepare information about how to return the results.
778 : : */
779 [ + + ]: 49430 : if (fcache->next_query_index < fcache->func->num_queries)
780 : 78 : return true;
781 : :
782 : : /*
783 : : * Construct a JunkFilter we can use to coerce the returned rowtype to the
784 : : * desired form, unless the result type is VOID, in which case there's
785 : : * nothing to coerce to. (XXX Frequently, the JunkFilter isn't doing
786 : : * anything very interesting, but much of this module expects it to be
787 : : * there anyway.)
788 : : *
789 : : * Normally we can re-use the JunkFilter across executions, but if the
790 : : * plan for the last CachedPlanSource changed, we'd better rebuild it.
791 : : *
792 : : * The JunkFilter, its result slot, and its tupledesc are kept in a
793 : : * subsidiary memory context so that we can free them easily when needed.
794 : : */
383 795 [ + + ]: 49352 : if (fcache->func->rettype != VOIDOID &&
796 [ + + ]: 49158 : (fcache->junkFilter == NULL ||
797 [ + + ]: 28933 : fcache->jf_generation != fcache->cplan->generation))
798 : : {
799 : : TupleTableSlot *slot;
800 : : List *resulttlist;
801 : : MemoryContext oldcontext;
802 : :
803 : : /* Create or reset the jfcontext */
804 [ + + ]: 21720 : if (fcache->jfcontext == NULL)
805 : 20225 : fcache->jfcontext = AllocSetContextCreate(fcache->fcontext,
806 : : "SQL function junkfilter",
807 : : ALLOCSET_SMALL_SIZES);
808 : : else
809 : 1495 : MemoryContextReset(fcache->jfcontext);
810 : 21720 : oldcontext = MemoryContextSwitchTo(fcache->jfcontext);
811 : :
812 : 21720 : slot = MakeSingleTupleTableSlot(NULL, &TTSOpsMinimalTuple);
813 : :
814 : : /*
815 : : * Re-fetch the (possibly modified) output tlist of the final
816 : : * statement. By this point, we should have thrown an error if there
817 : : * is not one.
818 : : */
398 819 : 21720 : resulttlist = get_sql_fn_result_tlist(plansource->query_list);
820 : :
821 : : /*
822 : : * If the result is composite, *and* we are returning the whole tuple
823 : : * result, we need to insert nulls for any dropped columns. In the
824 : : * single-column-result case, there might be dropped columns within
825 : : * the composite column value, but it's not our problem here. There
826 : : * should be no resjunk entries in resulttlist, so in the second case
827 : : * the JunkFilter is certainly a no-op.
828 : : */
829 [ + + + + ]: 21720 : if (fcache->func->rettupdesc && fcache->func->returnsTuple)
830 : 1314 : fcache->junkFilter = ExecInitJunkFilterConversion(resulttlist,
831 : 1314 : fcache->func->rettupdesc,
832 : : slot);
833 : : else
834 : 20406 : fcache->junkFilter = ExecInitJunkFilter(resulttlist, slot);
835 : :
836 : : /*
837 : : * The resulttlist tree belongs to the plancache and might disappear
838 : : * underneath us due to plancache invalidation. While we could
839 : : * forestall that by copying it, that'd just be a waste of cycles,
840 : : * because the junkfilter doesn't need it anymore. (It'd only be used
841 : : * by ExecFindJunkAttribute(), which we don't use here.) To ensure
842 : : * there's not a dangling pointer laying about, clear the junkFilter's
843 : : * pointer.
844 : : */
383 845 : 21720 : fcache->junkFilter->jf_targetList = NIL;
846 : :
847 : : /* Make sure output rowtype is properly blessed */
848 [ + + ]: 21720 : if (fcache->func->returnsTuple)
849 : 1330 : BlessTupleDesc(fcache->junkFilter->jf_resultSlot->tts_tupleDescriptor);
850 : :
851 : : /* Mark the JunkFilter as up-to-date */
852 : 21720 : fcache->jf_generation = fcache->cplan->generation;
853 : :
854 : 21720 : MemoryContextSwitchTo(oldcontext);
855 : : }
856 : :
857 [ + + ]: 49352 : if (fcache->func->returnsSet &&
858 [ + + - + ]: 3235 : !fcache->func->returnsTuple &&
859 : 124 : type_is_rowtype(fcache->func->rettype))
860 : : {
861 : : /*
862 : : * Returning rowtype as if it were scalar --- materialize won't work.
863 : : * Right now it's sufficient to override any caller preference for
864 : : * materialize mode, but this might need more work in future.
865 : : */
398 tgl@sss.pgh.pa.us 866 :UBC 0 : fcache->lazyEvalOK = true;
867 : : }
868 : :
869 : : /*
870 : : * Mark the last canSetTag query as delivering the function result; then,
871 : : * if it is a plain SELECT, mark it for lazy evaluation. If it's not a
872 : : * SELECT we must always run it to completion.
873 : : *
874 : : * Note: at some point we might add additional criteria for whether to use
875 : : * lazy eval. However, we should prefer to use it whenever the function
876 : : * doesn't return set, since fetching more than one row is useless in that
877 : : * case.
878 : : *
879 : : * Note: don't set setsResult if the function returns VOID, as evidenced
880 : : * by not having made a junkfilter. This ensures we'll throw away any
881 : : * output from the last statement in such a function.
882 : : */
6395 tgl@sss.pgh.pa.us 883 [ + - + + ]:CBC 49352 : if (lasttages && fcache->junkFilter)
884 : : {
885 : 49158 : lasttages->setsResult = true;
398 886 [ + + ]: 49158 : if (fcache->lazyEvalOK &&
3398 887 [ + + ]: 48403 : lasttages->stmt->commandType == CMD_SELECT &&
888 [ + - ]: 48351 : !lasttages->stmt->hasModifyingCTE)
889 : 48351 : fcache->lazyEval = lasttages->lazyEval = true;
890 : : }
891 : :
398 892 : 49352 : return true;
893 : : }
894 : :
895 : : /*
896 : : * Convert the SQL function's next query from source form (RawStmt or Query)
897 : : * into a CachedPlanSource. If it's the last query, also determine whether
898 : : * the function returnsTuple.
899 : : */
900 : : static void
901 : 1511 : prepare_next_query(SQLFunctionHashEntry *func)
902 : : {
903 : : int qindex;
904 : : bool islast;
905 : : CachedPlanSource *plansource;
906 : : List *queryTree_list;
907 : : MemoryContext oldcontext;
908 : :
909 : : /* Which query should we process? */
910 : 1511 : qindex = list_length(func->plansource_list);
911 [ - + ]: 1511 : Assert(qindex < func->num_queries); /* else caller error */
912 : 1511 : islast = (qindex + 1 >= func->num_queries);
913 : :
914 : : /*
915 : : * Parse and/or rewrite the query, creating a CachedPlanSource that holds
916 : : * a copy of the original parsetree. Note fine point: we make a copy of
917 : : * each original parsetree to ensure that the source_list in pcontext
918 : : * remains unmodified during parse analysis and rewrite. This is normally
919 : : * unnecessary, but we have to do it in case an error is raised during
920 : : * parse analysis. Otherwise, a fresh attempt to execute the function
921 : : * will arrive back here and try to work from a corrupted source_list.
922 : : */
923 [ + + ]: 1511 : if (!func->raw_source)
924 : : {
925 : : /* Source queries are already parse-analyzed */
926 : 620 : Query *parsetree = list_nth_node(Query, func->source_list, qindex);
927 : :
396 928 : 620 : parsetree = copyObject(parsetree);
398 929 : 620 : plansource = CreateCachedPlanForQuery(parsetree,
930 : 620 : func->src,
931 : : CreateCommandTag((Node *) parsetree));
932 : 620 : AcquireRewriteLocks(parsetree, true, false);
933 : 620 : queryTree_list = pg_rewrite_query(parsetree);
934 : : }
935 : : else
936 : : {
937 : : /* Source queries are raw parsetrees */
938 : 891 : RawStmt *parsetree = list_nth_node(RawStmt, func->source_list, qindex);
939 : :
396 940 : 891 : parsetree = copyObject(parsetree);
398 941 : 891 : plansource = CreateCachedPlan(parsetree,
942 : 891 : func->src,
943 : : CreateCommandTag(parsetree->stmt));
944 : 891 : queryTree_list = pg_analyze_and_rewrite_withcb(parsetree,
945 : 891 : func->src,
946 : : (ParserSetupHook) sql_fn_parser_setup,
947 : 891 : func->pinfo,
948 : : NULL);
949 : : }
950 : :
951 : : /*
952 : : * Check that there are no statements we don't want to allow.
953 : : */
954 : 1511 : check_sql_fn_statement(queryTree_list);
955 : :
956 : : /*
957 : : * If this is the last query, check that the function returns the type it
958 : : * claims to. Although in simple cases this was already done when the
959 : : * function was defined, we have to recheck because database objects used
960 : : * in the function's queries might have changed type. We'd have to
961 : : * recheck anyway if the function had any polymorphic arguments. Moreover,
962 : : * check_sql_stmt_retval takes care of injecting any required column type
963 : : * coercions. (But we don't ask it to insert nulls for dropped columns;
964 : : * the junkfilter handles that.)
965 : : *
966 : : * Note: we set func->returnsTuple according to whether we are returning
967 : : * the whole tuple result or just a single column. In the latter case we
968 : : * clear returnsTuple because we need not act different from the scalar
969 : : * result case, even if it's a rowtype column. (However, we have to force
970 : : * lazy eval mode in that case; otherwise we'd need extra code to expand
971 : : * the rowtype column into multiple columns, since we have no way to
972 : : * notify the caller that it should do that.)
973 : : */
974 [ + + ]: 1511 : if (islast)
975 : 1462 : func->returnsTuple = check_sql_stmt_retval(queryTree_list,
976 : : func->rettype,
977 : : func->rettupdesc,
978 : 1466 : func->prokind,
979 : : false);
980 : :
981 : : /*
982 : : * Now that check_sql_stmt_retval has done its thing, we can complete plan
983 : : * cache entry creation.
984 : : */
985 : 1507 : CompleteCachedPlan(plansource,
986 : : queryTree_list,
987 : : NULL,
988 : : NULL,
989 : : 0,
990 : : (ParserSetupHook) sql_fn_parser_setup,
991 : 1507 : func->pinfo,
992 : : CURSOR_OPT_PARALLEL_OK | CURSOR_OPT_NO_SCROLL,
993 : : false);
994 : :
995 : : /*
996 : : * Install post-rewrite hook. Its arg is the hash entry if this is the
997 : : * last statement, else NULL.
998 : : */
999 [ + + ]: 1507 : SetPostRewriteHook(plansource,
1000 : : sql_postrewrite_callback,
1001 : : islast ? func : NULL);
1002 : :
1003 : : /*
1004 : : * While the CachedPlanSources can take care of themselves, our List
1005 : : * pointing to them had better be in the hcontext.
1006 : : */
1007 : 1507 : oldcontext = MemoryContextSwitchTo(func->hcontext);
1008 : 1507 : func->plansource_list = lappend(func->plansource_list, plansource);
1009 : 1507 : MemoryContextSwitchTo(oldcontext);
1010 : :
1011 : : /*
1012 : : * As soon as we've linked the CachedPlanSource into the list, mark it as
1013 : : * "saved".
1014 : : */
1015 : 1507 : SaveCachedPlan(plansource);
1016 : :
1017 : : /*
1018 : : * Finally, if this was the last statement, we can flush the pcontext with
1019 : : * the original query trees; they're all safely copied into
1020 : : * CachedPlanSources now.
1021 : : */
1022 [ + + ]: 1507 : if (islast)
1023 : : {
1024 : 1462 : func->source_list = NIL; /* avoid dangling pointer */
1025 : 1462 : MemoryContextDelete(func->pcontext);
1026 : 1462 : func->pcontext = NULL;
1027 : : }
1028 : 1507 : }
1029 : :
1030 : : /*
1031 : : * Fill a new SQLFunctionHashEntry.
1032 : : *
1033 : : * The passed-in "cfunc" struct is expected to be zeroes, except
1034 : : * for the CachedFunction fields, which we don't touch here.
1035 : : *
1036 : : * We expect to be called in a short-lived memory context (typically a
1037 : : * query's per-tuple context). Data that is to be part of the hash entry
1038 : : * must be copied into the hcontext or pcontext as appropriate.
1039 : : */
1040 : : static void
1041 : 1490 : sql_compile_callback(FunctionCallInfo fcinfo,
1042 : : HeapTuple procedureTuple,
1043 : : const CachedFunctionHashKey *hashkey,
1044 : : CachedFunction *cfunc,
1045 : : bool forValidator)
1046 : : {
1047 : 1490 : SQLFunctionHashEntry *func = (SQLFunctionHashEntry *) cfunc;
1048 : 1490 : Form_pg_proc procedureStruct = (Form_pg_proc) GETSTRUCT(procedureTuple);
1049 : : ErrorContextCallback comperrcontext;
1050 : : MemoryContext hcontext;
1051 : : MemoryContext pcontext;
1052 : 1490 : MemoryContext oldcontext = CurrentMemoryContext;
1053 : : Oid rettype;
1054 : : TupleDesc rettupdesc;
1055 : : Datum tmp;
1056 : : bool isNull;
1057 : : List *source_list;
1058 : :
1059 : : /*
1060 : : * Setup error traceback support for ereport() during compile. (This is
1061 : : * mainly useful for reporting parse errors from pg_parse_query.)
1062 : : */
1063 : 1490 : comperrcontext.callback = sql_compile_error_callback;
1064 : 1490 : comperrcontext.arg = func;
1065 : 1490 : comperrcontext.previous = error_context_stack;
1066 : 1490 : error_context_stack = &comperrcontext;
1067 : :
1068 : : /*
1069 : : * Create the hash entry's memory context. For now it's a child of the
1070 : : * caller's context, so that it will go away if we fail partway through.
1071 : : */
1072 : 1490 : hcontext = AllocSetContextCreate(CurrentMemoryContext,
1073 : : "SQL function",
1074 : : ALLOCSET_SMALL_SIZES);
1075 : :
1076 : : /*
1077 : : * Create the not-as-long-lived pcontext. We make this a child of
1078 : : * hcontext so that it doesn't require separate deletion.
1079 : : */
1080 : 1490 : pcontext = AllocSetContextCreate(hcontext,
1081 : : "SQL function parse trees",
1082 : : ALLOCSET_SMALL_SIZES);
1083 : 1490 : func->pcontext = pcontext;
1084 : :
1085 : : /*
1086 : : * copy function name immediately for use by error reporting callback, and
1087 : : * for use as memory context identifier
1088 : : */
1089 : 2980 : func->fname = MemoryContextStrdup(hcontext,
1090 : 1490 : NameStr(procedureStruct->proname));
1091 : 1490 : MemoryContextSetIdentifier(hcontext, func->fname);
1092 : :
1093 : : /*
1094 : : * Resolve any polymorphism, obtaining the actual result type, and the
1095 : : * corresponding tupdesc if it's a rowtype.
1096 : : */
2309 1097 : 1490 : (void) get_call_result_type(fcinfo, &rettype, &rettupdesc);
1098 : :
398 1099 : 1490 : func->rettype = rettype;
1100 [ + + ]: 1490 : if (rettupdesc)
1101 : : {
1102 : 390 : MemoryContextSwitchTo(hcontext);
1103 : 390 : func->rettupdesc = CreateTupleDescCopy(rettupdesc);
1104 : 390 : MemoryContextSwitchTo(oldcontext);
1105 : : }
1106 : :
1107 : : /* Fetch the typlen and byval info for the result type */
1108 : 1490 : get_typlenbyval(rettype, &func->typlen, &func->typbyval);
1109 : :
1110 : : /* Remember whether we're returning setof something */
1111 : 1490 : func->returnsSet = procedureStruct->proretset;
1112 : :
1113 : : /* Remember if function is STABLE/IMMUTABLE */
1114 : 1490 : func->readonly_func =
7904 1115 : 1490 : (procedureStruct->provolatile != PROVOLATILE_VOLATILE);
1116 : :
1117 : : /* Remember routine kind */
398 1118 : 1490 : func->prokind = procedureStruct->prokind;
1119 : :
1120 : : /*
1121 : : * We need the actual argument types to pass to the parser. Also make
1122 : : * sure that parameter symbols are considered to have the function's
1123 : : * resolved input collation.
1124 : : */
1125 : 1490 : MemoryContextSwitchTo(hcontext);
1126 : 2980 : func->pinfo = prepare_sql_fn_parse_info(procedureTuple,
1127 : 1490 : fcinfo->flinfo->fn_expr,
1128 : : PG_GET_COLLATION());
1129 : 1490 : MemoryContextSwitchTo(oldcontext);
1130 : :
1131 : : /*
1132 : : * Now that we have the resolved argument types, collect their typlens for
1133 : : * use in postquel_sub_params.
1134 : : */
383 1135 : 1490 : func->argtyplen = (int16 *)
1136 : 1490 : MemoryContextAlloc(hcontext, func->pinfo->nargs * sizeof(int16));
1137 [ + + ]: 3640 : for (int i = 0; i < func->pinfo->nargs; i++)
1138 : 2150 : func->argtyplen[i] = get_typlen(func->pinfo->argtypes[i]);
1139 : :
1140 : : /*
1141 : : * And of course we need the function body text.
1142 : : */
1137 dgustafsson@postgres 1143 : 1490 : tmp = SysCacheGetAttrNotNull(PROCOID, procedureTuple, Anum_pg_proc_prosrc);
398 tgl@sss.pgh.pa.us 1144 : 1490 : func->src = MemoryContextStrdup(hcontext,
1145 : 1490 : TextDatumGetCString(tmp));
1146 : :
1147 : : /* If we have prosqlbody, pay attention to that not prosrc. */
1846 1148 : 1490 : tmp = SysCacheGetAttr(PROCOID,
1149 : : procedureTuple,
1150 : : Anum_pg_proc_prosqlbody,
1151 : : &isNull);
1152 [ + + ]: 1490 : if (!isNull)
1153 : : {
1154 : : /* Source queries are already parse-analyzed */
1155 : : Node *n;
1156 : :
1854 peter@eisentraut.org 1157 : 620 : n = stringToNode(TextDatumGetCString(tmp));
1158 [ + + ]: 620 : if (IsA(n, List))
398 tgl@sss.pgh.pa.us 1159 : 473 : source_list = linitial_node(List, castNode(List, n));
1160 : : else
1161 : 147 : source_list = list_make1(n);
1162 : 620 : func->raw_source = false;
1163 : : }
1164 : : else
1165 : : {
1166 : : /* Source queries are raw parsetrees */
1167 : 870 : source_list = pg_parse_query(func->src);
1168 : 870 : func->raw_source = true;
1169 : : }
1170 : :
1171 : : /*
1172 : : * Note: we must save the number of queries so that we'll still remember
1173 : : * how many there are after we discard source_list.
1174 : : */
1175 : 1490 : func->num_queries = list_length(source_list);
1176 : :
1177 : : /*
1178 : : * Edge case: empty function body is OK only if it returns VOID. Normally
1179 : : * we validate that the last statement returns the right thing in
1180 : : * check_sql_stmt_retval, but we'll never reach that if there's no last
1181 : : * statement.
1182 : : */
397 1183 [ + + + + ]: 1490 : if (func->num_queries == 0 && rettype != VOIDOID)
1184 [ + - ]: 4 : ereport(ERROR,
1185 : : (errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
1186 : : errmsg("return type mismatch in function declared to return %s",
1187 : : format_type_be(rettype)),
1188 : : errdetail("Function's final statement must be SELECT or INSERT/UPDATE/DELETE/MERGE RETURNING.")));
1189 : :
1190 : : /* Save the source trees in pcontext for now. */
398 1191 : 1486 : MemoryContextSwitchTo(pcontext);
1192 : 1486 : func->source_list = copyObject(source_list);
1193 : 1486 : MemoryContextSwitchTo(oldcontext);
1194 : :
1195 : : /*
1196 : : * We now have a fully valid hash entry, so reparent hcontext under
1197 : : * CacheMemoryContext to make all the subsidiary data long-lived, and only
1198 : : * then install the hcontext link so that sql_delete_callback will know to
1199 : : * delete it.
1200 : : */
1201 : 1486 : MemoryContextSetParent(hcontext, CacheMemoryContext);
1202 : 1486 : func->hcontext = hcontext;
1203 : :
1204 : 1486 : error_context_stack = comperrcontext.previous;
1205 : 1486 : }
1206 : :
1207 : : /*
1208 : : * Deletion callback used by funccache.c.
1209 : : *
1210 : : * Free any free-able subsidiary data of cfunc, but not the
1211 : : * struct CachedFunction itself.
1212 : : */
1213 : : static void
1214 : 44 : sql_delete_callback(CachedFunction *cfunc)
1215 : : {
1216 : 44 : SQLFunctionHashEntry *func = (SQLFunctionHashEntry *) cfunc;
1217 : : ListCell *lc;
1218 : :
1219 : : /* Release the CachedPlanSources */
1220 [ + - + + : 88 : foreach(lc, func->plansource_list)
+ + ]
1221 : : {
1222 : 44 : CachedPlanSource *plansource = (CachedPlanSource *) lfirst(lc);
1223 : :
1224 : 44 : DropCachedPlan(plansource);
1225 : : }
1226 : 44 : func->plansource_list = NIL;
1227 : :
1228 : : /*
1229 : : * If we have an hcontext, free it, thereby getting rid of all subsidiary
1230 : : * data. (If we still have a pcontext, this gets rid of that too.)
1231 : : */
1232 [ + - ]: 44 : if (func->hcontext)
1233 : 44 : MemoryContextDelete(func->hcontext);
1234 : 44 : func->hcontext = NULL;
1235 : 44 : }
1236 : :
1237 : : /*
1238 : : * Post-rewrite callback used by plancache.c.
1239 : : *
1240 : : * This must match the processing that prepare_next_query() does between
1241 : : * rewriting and calling CompleteCachedPlan().
1242 : : */
1243 : : static void
1244 : 404 : sql_postrewrite_callback(List *querytree_list, void *arg)
1245 : : {
1246 : : /*
1247 : : * Check that there are no statements we don't want to allow. (Presently,
1248 : : * there's no real point in this because the result can't change from what
1249 : : * we saw originally. But it's cheap and maybe someday it will matter.)
1250 : : */
1251 : 404 : check_sql_fn_statement(querytree_list);
1252 : :
1253 : : /*
1254 : : * If this is the last query, we must re-do what check_sql_stmt_retval did
1255 : : * to its targetlist. Also check that returnsTuple didn't change (it
1256 : : * probably cannot, but be cautious).
1257 : : */
1258 [ + + ]: 404 : if (arg != NULL)
1259 : : {
1260 : 403 : SQLFunctionHashEntry *func = (SQLFunctionHashEntry *) arg;
1261 : : bool returnsTuple;
1262 : :
1263 : 403 : returnsTuple = check_sql_stmt_retval(querytree_list,
1264 : : func->rettype,
1265 : : func->rettupdesc,
1266 : 403 : func->prokind,
1267 : : false);
1268 [ - + ]: 403 : if (returnsTuple != func->returnsTuple)
398 tgl@sss.pgh.pa.us 1269 [ # # ]:UBC 0 : ereport(ERROR,
1270 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1271 : : errmsg("cached plan must not change result type")));
1272 : : }
9385 tgl@sss.pgh.pa.us 1273 :CBC 404 : }
1274 : :
1275 : : /* Start up execution of one execution_state node */
1276 : : static void
8552 1277 : 49434 : postquel_start(execution_state *es, SQLFunctionCachePtr fcache)
1278 : : {
1279 : : DestReceiver *dest;
368 1280 : 49434 : MemoryContext oldcontext = CurrentMemoryContext;
1281 : :
8552 1282 [ - + ]: 49434 : Assert(es->qd == NULL);
1283 : :
1284 : : /* Caller should have ensured a suitable snapshot is active */
5545 1285 [ - + ]: 49434 : Assert(ActiveSnapshotSet());
1286 : :
1287 : : /*
1288 : : * In lazyEval mode for a SRF, we must run the sub-executor in a child of
1289 : : * fcontext, so that it can survive across multiple calls to fmgr_sql.
1290 : : * (XXX in the case of a long-lived FmgrInfo, this policy potentially
1291 : : * causes memory leakage, but it's not very clear where we could keep
1292 : : * stuff instead. Fortunately, there are few if any cases where
1293 : : * set-returning functions are invoked via FmgrInfos that would outlive
1294 : : * the calling query.) Otherwise, we're going to run it to completion
1295 : : * before exiting fmgr_sql, so it can perfectly well run in the caller's
1296 : : * context.
1297 : : */
383 1298 [ + + + + ]: 49434 : if (es->lazyEval && fcache->func->returnsSet)
383 tgl@sss.pgh.pa.us 1299 :GIC 2332 : {
383 tgl@sss.pgh.pa.us 1300 :CBC 2332 : fcache->subcontext = AllocSetContextCreate(fcache->fcontext,
1301 : : "SQL function execution",
1302 : : ALLOCSET_DEFAULT_SIZES);
1303 : 2332 : fcache->ownSubcontext = true;
1304 : : }
1305 [ + + ]: 47102 : else if (es->stmt->commandType == CMD_UTILITY)
1306 : : {
1307 : : /*
1308 : : * The code path using a sub-executor is pretty good about cleaning up
1309 : : * cruft, since the executor will make its own sub-context. We don't
1310 : : * really need an additional layer of sub-context in that case.
1311 : : * However, if this is a utility statement, it won't make its own
1312 : : * sub-context, so it seems advisable to make one that we can free on
1313 : : * completion.
1314 : : */
1315 : 116 : fcache->subcontext = AllocSetContextCreate(CurrentMemoryContext,
1316 : : "SQL function execution",
1317 : : ALLOCSET_DEFAULT_SIZES);
1318 : 116 : fcache->ownSubcontext = true;
1319 : : }
1320 : : else
1321 : : {
1322 : 46986 : fcache->subcontext = CurrentMemoryContext;
1323 : 46986 : fcache->ownSubcontext = false;
1324 : : }
1325 : :
1326 : : /*
1327 : : * Build a tuplestore if needed, that is if it's a set-returning function
1328 : : * and we're producing the function result without using lazyEval mode.
1329 : : */
368 1330 [ + + ]: 49434 : if (es->setsResult)
1331 : : {
1332 [ - + ]: 49158 : Assert(fcache->tstore == NULL);
1333 [ + + + + ]: 49158 : if (fcache->func->returnsSet && !es->lazyEval)
1334 : : {
1335 : 775 : MemoryContextSwitchTo(fcache->tscontext);
1336 : 775 : fcache->tstore = tuplestore_begin_heap(fcache->randomAccess,
1337 : : false, work_mem);
1338 : : }
1339 : : }
1340 : :
1341 : : /* Switch into the selected subcontext (might be a no-op) */
1342 : 49434 : MemoryContextSwitchTo(fcache->subcontext);
1343 : :
1344 : : /*
1345 : : * If this query produces the function result, collect its output using
1346 : : * our custom DestReceiver; else discard any output.
1347 : : */
6395 1348 [ + + ]: 49434 : if (es->setsResult)
1349 : : {
1350 : : DR_sqlfunction *myState;
1351 : :
6365 1352 : 49158 : dest = CreateDestReceiver(DestSQLFunction);
1353 : : /* pass down the needed info to the dest receiver routines */
6395 1354 : 49158 : myState = (DR_sqlfunction *) dest;
1355 [ - + ]: 49158 : Assert(myState->pub.mydest == DestSQLFunction);
368 1356 : 49158 : myState->tstore = fcache->tstore; /* might be NULL */
6395 1357 : 49158 : myState->filter = fcache->junkFilter;
1358 : :
1359 : : /* Make very sure the junkfilter's result slot is empty */
368 1360 : 49158 : ExecClearTuple(fcache->junkFilter->jf_resultSlot);
1361 : : }
1362 : : else
6395 1363 : 276 : dest = None_Receiver;
1364 : :
3398 1365 : 49434 : es->qd = CreateQueryDesc(es->stmt,
398 1366 : 49434 : fcache->func->src,
1367 : : GetActiveSnapshot(),
1368 : : InvalidSnapshot,
1369 : : dest,
1370 : : fcache->paramLI,
3322 kgrittn@postgresql.o 1371 [ - + ]: 49434 : es->qd ? es->qd->queryEnv : NULL,
1372 : : 0);
1373 : :
1374 : : /* Utility commands don't need Executor. */
3398 tgl@sss.pgh.pa.us 1375 [ + + ]: 49434 : if (es->qd->operation != CMD_UTILITY)
1376 : : {
1377 : : /*
1378 : : * In lazyEval mode, do not let the executor set up an AfterTrigger
1379 : : * context. This is necessary not just an optimization, because we
1380 : : * mustn't exit from the function execution with a stacked
1381 : : * AfterTrigger level still active. We are careful not to select
1382 : : * lazyEval mode for any statement that could possibly queue triggers.
1383 : : */
1384 : : int eflags;
1385 : :
5546 1386 [ + + ]: 49318 : if (es->lazyEval)
1387 : 48351 : eflags = EXEC_FLAG_SKIP_TRIGGERS;
1388 : : else
1389 : 967 : eflags = 0; /* default run-to-completion flags */
348 amitlan@postgresql.o 1390 : 49318 : ExecutorStart(es->qd, eflags);
1391 : : }
1392 : :
8552 tgl@sss.pgh.pa.us 1393 : 49422 : es->status = F_EXEC_RUN;
1394 : :
383 1395 : 49422 : MemoryContextSwitchTo(oldcontext);
10892 scrappy@hub.org 1396 : 49422 : }
1397 : :
1398 : : /* Run one execution_state; either to completion or to first result row */
1399 : : /* Returns true if we ran to completion */
1400 : : static bool
6993 tgl@sss.pgh.pa.us 1401 : 50338 : postquel_getnext(execution_state *es, SQLFunctionCachePtr fcache)
1402 : : {
1403 : : bool result;
1404 : : MemoryContext oldcontext;
1405 : :
1406 : : /* Run the sub-executor in subcontext */
383 1407 : 50338 : oldcontext = MemoryContextSwitchTo(fcache->subcontext);
1408 : :
3398 1409 [ + + ]: 50338 : if (es->qd->operation == CMD_UTILITY)
1410 : : {
1411 : 116 : ProcessUtility(es->qd->plannedstmt,
398 1412 : 116 : fcache->func->src,
1413 : : true, /* protect function cache's parsetree */
1414 : : PROCESS_UTILITY_QUERY,
6567 alvherre@alvh.no-ip. 1415 : 116 : es->qd->params,
3322 kgrittn@postgresql.o 1416 : 116 : es->qd->queryEnv,
6567 alvherre@alvh.no-ip. 1417 : 116 : es->qd->dest,
1418 : : NULL);
6395 tgl@sss.pgh.pa.us 1419 : 54 : result = true; /* never stops early */
1420 : : }
1421 : : else
1422 : : {
1423 : : /* Run regular commands to completion unless lazyEval */
3706 1424 : 50222 : uint64 count = (es->lazyEval) ? 1 : 0;
1425 : :
512 1426 : 50222 : ExecutorRun(es->qd, ForwardScanDirection, count);
1427 : :
1428 : : /*
1429 : : * If we requested run to completion OR there was no tuple returned,
1430 : : * command must be complete.
1431 : : */
3706 1432 [ + + + + ]: 44851 : result = (count == 0 || es->qd->estate->es_processed == 0);
1433 : : }
1434 : :
383 1435 : 44905 : MemoryContextSwitchTo(oldcontext);
1436 : :
7904 1437 : 44905 : return result;
1438 : : }
1439 : :
1440 : : /* Shut down execution of one execution_state node */
1441 : : static void
383 1442 : 43989 : postquel_end(execution_state *es, SQLFunctionCachePtr fcache)
1443 : : {
1444 : : MemoryContext oldcontext;
1445 : :
1446 : : /* Run the sub-executor in subcontext */
1447 : 43989 : oldcontext = MemoryContextSwitchTo(fcache->subcontext);
1448 : :
1449 : : /* mark status done to ensure we don't do ExecutorEnd twice */
8317 1450 : 43989 : es->status = F_EXEC_DONE;
1451 : :
1452 : : /* Utility commands don't need Executor. */
3398 1453 [ + + ]: 43989 : if (es->qd->operation != CMD_UTILITY)
1454 : : {
5546 1455 : 43935 : ExecutorFinish(es->qd);
6567 alvherre@alvh.no-ip. 1456 : 43923 : ExecutorEnd(es->qd);
1457 : : }
1458 : :
3162 peter_e@gmx.net 1459 : 43977 : es->qd->dest->rDestroy(es->qd->dest);
1460 : :
8542 tgl@sss.pgh.pa.us 1461 : 43977 : FreeQueryDesc(es->qd);
8552 1462 : 43977 : es->qd = NULL;
1463 : :
383 1464 : 43977 : MemoryContextSwitchTo(oldcontext);
1465 : :
1466 : : /* Delete the subcontext, if it's actually a separate context */
1467 [ + + ]: 43977 : if (fcache->ownSubcontext)
1468 : 2386 : MemoryContextDelete(fcache->subcontext);
1469 : 43977 : fcache->subcontext = NULL;
10892 scrappy@hub.org 1470 : 43977 : }
1471 : :
1472 : : /* Build ParamListInfo array representing current arguments */
1473 : : static void
8552 tgl@sss.pgh.pa.us 1474 : 49413 : postquel_sub_params(SQLFunctionCachePtr fcache,
1475 : : FunctionCallInfo fcinfo)
1476 : : {
1477 : 49413 : int nargs = fcinfo->nargs;
1478 : :
1479 [ + + ]: 49413 : if (nargs > 0)
1480 : : {
1481 : : ParamListInfo paramLI;
398 1482 : 43503 : Oid *argtypes = fcache->func->pinfo->argtypes;
383 1483 : 43503 : int16 *argtyplen = fcache->func->argtyplen;
1484 : :
6395 1485 [ + + ]: 43503 : if (fcache->paramLI == NULL)
1486 : : {
1487 : : /* First time through: build a persistent ParamListInfo struct */
1488 : : MemoryContext oldcontext;
1489 : :
383 1490 : 14608 : oldcontext = MemoryContextSwitchTo(fcache->fcontext);
2609 peter@eisentraut.org 1491 : 14608 : paramLI = makeParamList(nargs);
6395 tgl@sss.pgh.pa.us 1492 : 14608 : fcache->paramLI = paramLI;
383 1493 : 14608 : MemoryContextSwitchTo(oldcontext);
1494 : : }
1495 : : else
1496 : : {
6395 1497 : 28895 : paramLI = fcache->paramLI;
1498 [ - + ]: 28895 : Assert(paramLI->numParams == nargs);
1499 : : }
1500 : :
2609 peter@eisentraut.org 1501 [ + + ]: 127449 : for (int i = 0; i < nargs; i++)
1502 : : {
7318 tgl@sss.pgh.pa.us 1503 : 83946 : ParamExternData *prm = ¶mLI->params[i];
1504 : :
1505 : : /*
1506 : : * If an incoming parameter value is a R/W expanded datum, we
1507 : : * force it to R/O. We'd be perfectly entitled to scribble on it,
1508 : : * but the problem is that if the parameter is referenced more
1509 : : * than once in the function, earlier references might mutate the
1510 : : * value seen by later references, which won't do at all. We
1511 : : * could do better if we could be sure of the number of Param
1512 : : * nodes in the function's plans; but we might not have planned
1513 : : * all the statements yet, nor do we have plan tree walker
1514 : : * infrastructure. (Examining the parse trees is not good enough,
1515 : : * because of possible function inlining during planning.)
1516 : : */
2656 andres@anarazel.de 1517 : 83946 : prm->isnull = fcinfo->args[i].isnull;
1364 tgl@sss.pgh.pa.us 1518 [ + + + + ]: 83946 : prm->value = MakeExpandedObjectReadOnly(fcinfo->args[i].value,
1519 : : prm->isnull,
1520 : : argtyplen[i]);
1521 : : /* Allow the value to be substituted into custom plans */
398 1522 : 83946 : prm->pflags = PARAM_FLAG_CONST;
1364 1523 : 83946 : prm->ptype = argtypes[i];
1524 : : }
1525 : : }
1526 : : else
6395 1527 : 5910 : fcache->paramLI = NULL;
10892 scrappy@hub.org 1528 : 49413 : }
1529 : :
1530 : : /*
1531 : : * Extract the SQL function's value from a single result row. This is used
1532 : : * both for scalar (non-set) functions and for each row of a lazy-eval set
1533 : : * result. We expect the current memory context to be that of the caller
1534 : : * of fmgr_sql.
1535 : : */
1536 : : static Datum
6395 tgl@sss.pgh.pa.us 1537 : 37770 : postquel_get_single_result(TupleTableSlot *slot,
1538 : : FunctionCallInfo fcinfo,
1539 : : SQLFunctionCachePtr fcache)
1540 : : {
1541 : : Datum value;
1542 : :
1543 : : /*
1544 : : * Set up to return the function value. For pass-by-reference datatypes,
1545 : : * be sure to copy the result into the current context. We can't leave
1546 : : * the data in the TupleTableSlot because we must clear the slot before
1547 : : * returning.
1548 : : */
398 1549 [ + + ]: 37770 : if (fcache->func->returnsTuple)
1550 : : {
1551 : : /* We must return the whole tuple as a Datum. */
7904 1552 : 1248 : fcinfo->isnull = false;
2728 andres@anarazel.de 1553 : 1248 : value = ExecFetchSlotHeapTupleDatum(slot);
1554 : : }
1555 : : else
1556 : : {
1557 : : /*
1558 : : * Returning a scalar, which we have to extract from the first column
1559 : : * of the SELECT result, and then copy into current context if needed.
1560 : : */
7720 tgl@sss.pgh.pa.us 1561 : 36522 : value = slot_getattr(slot, 1, &(fcinfo->isnull));
1562 : :
7904 1563 [ + + ]: 36522 : if (!fcinfo->isnull)
398 1564 : 36272 : value = datumCopy(value, fcache->func->typbyval, fcache->func->typlen);
1565 : : }
1566 : :
1567 : : /* Clear the slot for next time */
368 1568 : 37770 : ExecClearTuple(slot);
1569 : :
7904 1570 : 37770 : return value;
1571 : : }
1572 : :
1573 : : /*
1574 : : * fmgr_sql: function call manager for SQL functions
1575 : : */
1576 : : Datum
9385 1577 : 50333 : fmgr_sql(PG_FUNCTION_ARGS)
1578 : : {
1579 : : SQLFunctionCachePtr fcache;
1580 : : ErrorContextCallback sqlerrcontext;
1581 : : MemoryContext tscontext;
1582 : : bool randomAccess;
1583 : : bool lazyEvalOK;
1584 : : bool pushed_snapshot;
1585 : : execution_state *es;
1586 : : TupleTableSlot *slot;
1587 : : Datum result;
1588 : :
1589 : : /* Check call context */
6395 1590 [ + + ]: 50333 : if (fcinfo->flinfo->fn_retset)
1591 : : {
1592 : 4031 : ReturnSetInfo *rsi = (ReturnSetInfo *) fcinfo->resultinfo;
1593 : :
1594 : : /*
1595 : : * For simplicity, we require callers to support both set eval modes.
1596 : : * There are cases where we must use one or must use the other, and
1597 : : * it's not really worthwhile to postpone the check till we know. But
1598 : : * note we do not require caller to provide an expectedDesc.
1599 : : */
1600 [ + - + - ]: 4031 : if (!rsi || !IsA(rsi, ReturnSetInfo) ||
1601 [ + - ]: 4031 : (rsi->allowedModes & SFRM_ValuePerCall) == 0 ||
6172 1602 [ - + ]: 4031 : (rsi->allowedModes & SFRM_Materialize) == 0)
6395 tgl@sss.pgh.pa.us 1603 [ # # ]:UBC 0 : ereport(ERROR,
1604 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1605 : : errmsg("set-valued function called in context that cannot accept a set")));
6395 tgl@sss.pgh.pa.us 1606 :CBC 4031 : randomAccess = rsi->allowedModes & SFRM_Materialize_Random;
1607 : 4031 : lazyEvalOK = !(rsi->allowedModes & SFRM_Materialize_Preferred);
1608 : : /* tuplestore, if used, must have query lifespan */
368 1609 : 4031 : tscontext = rsi->econtext->ecxt_per_query_memory;
1610 : : }
1611 : : else
1612 : : {
6395 1613 : 46302 : randomAccess = false;
1614 : 46302 : lazyEvalOK = true;
1615 : : /* we won't need a tuplestore */
368 1616 : 46302 : tscontext = NULL;
1617 : : }
1618 : :
1619 : : /*
1620 : : * Initialize fcache if starting a fresh execution.
1621 : : */
398 1622 : 50333 : fcache = init_sql_fcache(fcinfo, lazyEvalOK);
1623 : :
1624 : : /* Mark fcache as active */
258 1625 : 50329 : fcache->active = true;
1626 : :
1627 : : /* Remember info that we might need later to construct tuplestore */
368 1628 : 50329 : fcache->tscontext = tscontext;
1629 : 50329 : fcache->randomAccess = randomAccess;
1630 : :
1631 : : /*
1632 : : * Now we can set up error traceback support for ereport()
1633 : : */
398 1634 : 50329 : sqlerrcontext.callback = sql_exec_error_callback;
1635 : 50329 : sqlerrcontext.arg = fcache;
1636 : 50329 : sqlerrcontext.previous = error_context_stack;
1637 : 50329 : error_context_stack = &sqlerrcontext;
1638 : :
1639 : : /*
1640 : : * Find first unfinished execution_state. If none, advance to the next
1641 : : * query in function.
1642 : : */
1643 : : do
1644 : : {
1645 : 99701 : es = fcache->eslist;
5545 1646 [ + + - + ]: 99701 : while (es && es->status == F_EXEC_DONE)
5545 tgl@sss.pgh.pa.us 1647 :UBC 0 : es = es->next;
5545 tgl@sss.pgh.pa.us 1648 [ + + ]:CBC 99701 : if (es)
1649 : 50288 : break;
398 1650 [ + + ]: 49413 : } while (init_execution_state(fcache));
1651 : :
1652 : : /*
1653 : : * Execute each command in the function one after another until we either
1654 : : * run out of commands or get a result row from a lazily-evaluated SELECT.
1655 : : *
1656 : : * Notes about snapshot management:
1657 : : *
1658 : : * In a read-only function, we just use the surrounding query's snapshot.
1659 : : *
1660 : : * In a non-read-only function, we rely on the fact that we'll never
1661 : : * suspend execution between queries of the function: the only reason to
1662 : : * suspend execution before completion is if we are returning a row from a
1663 : : * lazily-evaluated SELECT. So, when first entering this loop, we'll
1664 : : * either start a new query (and push a fresh snapshot) or re-establish
1665 : : * the active snapshot from the existing query descriptor. If we need to
1666 : : * start a new query in a subsequent execution of the loop, either we need
1667 : : * a fresh snapshot (and pushed_snapshot is false) or the existing
1668 : : * snapshot is on the active stack and we can just bump its command ID.
1669 : : */
5545 1670 : 50292 : pushed_snapshot = false;
8656 1671 [ + + ]: 94265 : while (es)
1672 : : {
1673 : : bool completed;
1674 : :
6395 1675 [ + + ]: 50350 : if (es->status == F_EXEC_START)
1676 : : {
1677 : : /*
1678 : : * If not read-only, be sure to advance the command counter for
1679 : : * each command, so that all work to date in this transaction is
1680 : : * visible. Take a new snapshot if we don't have one yet,
1681 : : * otherwise just bump the command ID in the existing snapshot.
1682 : : */
398 1683 [ + + ]: 49434 : if (!fcache->func->readonly_func)
1684 : : {
5545 1685 : 40448 : CommandCounterIncrement();
1686 [ + + ]: 40448 : if (!pushed_snapshot)
1687 : : {
1688 : 40444 : PushActiveSnapshot(GetTransactionSnapshot());
1689 : 40444 : pushed_snapshot = true;
1690 : : }
1691 : : else
1692 : 4 : UpdateActiveSnapshotCommandId();
1693 : : }
1694 : :
6395 1695 : 49434 : postquel_start(es, fcache);
1696 : : }
398 1697 [ + + + - ]: 916 : else if (!fcache->func->readonly_func && !pushed_snapshot)
1698 : : {
1699 : : /* Re-establish active snapshot when re-entering function */
5545 1700 : 426 : PushActiveSnapshot(es->qd->snapshot);
1701 : 426 : pushed_snapshot = true;
1702 : : }
1703 : :
6395 1704 : 50338 : completed = postquel_getnext(es, fcache);
1705 : :
1706 : : /*
1707 : : * If we ran the command to completion, we can shut it down now. Any
1708 : : * row(s) we need to return are safely stashed in the result slot or
1709 : : * tuplestore, and we want to be sure that, for example, AFTER
1710 : : * triggers get fired before we return anything. Also, if the
1711 : : * function doesn't return set, we can shut it down anyway because it
1712 : : * must be a SELECT and we don't care about fetching any more result
1713 : : * rows.
1714 : : */
398 1715 [ + + + + ]: 44905 : if (completed || !fcache->func->returnsSet)
383 1716 : 43985 : postquel_end(es, fcache);
1717 : :
1718 : : /*
1719 : : * Break from loop if we didn't shut down (implying we got a
1720 : : * lazily-evaluated row). Otherwise we'll press on till the whole
1721 : : * function is done, relying on the tuplestore to keep hold of the
1722 : : * data to eventually be returned. This is necessary since an
1723 : : * INSERT/UPDATE/DELETE RETURNING that sets the result might be
1724 : : * followed by additional rule-inserted commands, and we want to
1725 : : * finish doing all those commands before we return anything.
1726 : : */
10467 bruce@momjian.us 1727 [ + + ]: 44893 : if (es->status != F_EXEC_DONE)
1728 : 920 : break;
1729 : :
1730 : : /*
1731 : : * Advance to next execution_state, and perhaps next query.
1732 : : */
1733 : 43973 : es = es->next;
5545 tgl@sss.pgh.pa.us 1734 [ + + ]: 44031 : while (!es)
1735 : : {
1736 : : /*
1737 : : * Flush the current snapshot so that we will take a new one for
1738 : : * the new query list. This ensures that new snaps are taken at
1739 : : * original-query boundaries, matching the behavior of interactive
1740 : : * execution.
1741 : : */
1742 [ + + ]: 43969 : if (pushed_snapshot)
1743 : : {
1744 : 35016 : PopActiveSnapshot();
1745 : 35016 : pushed_snapshot = false;
1746 : : }
1747 : :
398 1748 [ + + ]: 43969 : if (!init_execution_state(fcache))
1749 : 43911 : break; /* end of function */
1750 : :
1751 : 58 : es = fcache->eslist;
1752 : : }
1753 : : }
1754 : :
1755 : : /*
1756 : : * The result slot or tuplestore now contains whatever row(s) we are
1757 : : * supposed to return.
1758 : : */
1759 [ + + ]: 44835 : if (fcache->func->returnsSet)
1760 : : {
6395 1761 : 4019 : ReturnSetInfo *rsi = (ReturnSetInfo *) fcinfo->resultinfo;
1762 : :
1763 [ + + ]: 4019 : if (es)
1764 : : {
1765 : : /*
1766 : : * If we stopped short of being done, we must have a lazy-eval
1767 : : * row.
1768 : : */
1769 [ - + ]: 920 : Assert(es->lazyEval);
1770 : : /* The junkfilter's result slot contains the query result tuple */
1771 [ - + ]: 920 : Assert(fcache->junkFilter);
1772 : 920 : slot = fcache->junkFilter->jf_resultSlot;
368 1773 [ - + ]: 920 : Assert(!TTS_EMPTY(slot));
1774 : : /* Extract the result as a datum, and copy out from the slot */
383 1775 : 920 : result = postquel_get_single_result(slot, fcinfo, fcache);
1776 : :
1777 : : /*
1778 : : * Let caller know we're not finished.
1779 : : */
6395 1780 : 920 : rsi->isDone = ExprMultipleResult;
1781 : :
1782 : : /*
1783 : : * Ensure we will get shut down cleanly if the exprcontext is not
1784 : : * run to completion.
1785 : : */
1786 [ + + ]: 920 : if (!fcache->shutdown_reg)
1787 : : {
1788 : 699 : RegisterExprContextCallback(rsi->econtext,
1789 : : ShutdownSQLFunction,
1790 : : PointerGetDatum(fcache));
1791 : 699 : fcache->shutdown_reg = true;
1792 : : }
1793 : : }
1794 [ + + ]: 3099 : else if (fcache->lazyEval)
1795 : : {
1796 : : /*
1797 : : * We are done with a lazy evaluation. Let caller know we're
1798 : : * finished.
1799 : : */
1800 : 2328 : rsi->isDone = ExprEndResult;
1801 : :
9385 1802 : 2328 : fcinfo->isnull = true;
1803 : 2328 : result = (Datum) 0;
1804 : :
1805 : : /* Deregister shutdown callback, if we made one */
8759 1806 [ + + ]: 2328 : if (fcache->shutdown_reg)
1807 : : {
1808 : 695 : UnregisterExprContextCallback(rsi->econtext,
1809 : : ShutdownSQLFunction,
1810 : : PointerGetDatum(fcache));
1811 : 695 : fcache->shutdown_reg = false;
1812 : : }
1813 : : }
1814 : : else
1815 : : {
1816 : : /*
1817 : : * We are done with a non-lazy evaluation. Return whatever is in
1818 : : * the tuplestore. (It is now caller's responsibility to free the
1819 : : * tuplestore when done.)
1820 : : *
1821 : : * Note an edge case: we could get here without having made a
1822 : : * tuplestore if the function is declared to return SETOF VOID.
1823 : : * ExecMakeTableFunctionResult will cope with null setResult.
1824 : : */
368 1825 [ + + - + ]: 771 : Assert(fcache->tstore || fcache->func->rettype == VOIDOID);
6395 1826 : 771 : rsi->returnMode = SFRM_Materialize;
1827 : 771 : rsi->setResult = fcache->tstore;
1828 : 771 : fcache->tstore = NULL;
1829 : : /* must copy desc because execSRF.c will free it */
1830 [ + + ]: 771 : if (fcache->junkFilter)
1831 : 767 : rsi->setDesc = CreateTupleDescCopy(fcache->junkFilter->jf_cleanTupType);
1832 : :
1833 : 771 : fcinfo->isnull = true;
1834 : 771 : result = (Datum) 0;
1835 : :
1836 : : /* Deregister shutdown callback, if we made one */
1837 [ - + ]: 771 : if (fcache->shutdown_reg)
1838 : : {
6395 tgl@sss.pgh.pa.us 1839 :UBC 0 : UnregisterExprContextCallback(rsi->econtext,
1840 : : ShutdownSQLFunction,
1841 : : PointerGetDatum(fcache));
1842 : 0 : fcache->shutdown_reg = false;
1843 : : }
1844 : : }
1845 : : }
1846 : : else
1847 : : {
1848 : : /*
1849 : : * Non-set function. If we got a row, return it; else return NULL.
1850 : : */
6395 tgl@sss.pgh.pa.us 1851 [ + + ]:CBC 40816 : if (fcache->junkFilter)
1852 : : {
1853 : : /* The junkfilter's result slot contains the query result tuple */
1854 : 40677 : slot = fcache->junkFilter->jf_resultSlot;
368 1855 [ + + ]: 40677 : if (!TTS_EMPTY(slot))
383 1856 : 36850 : result = postquel_get_single_result(slot, fcinfo, fcache);
1857 : : else
1858 : : {
6395 1859 : 3827 : fcinfo->isnull = true;
1860 : 3827 : result = (Datum) 0;
1861 : : }
1862 : : }
1863 : : else
1864 : : {
1865 : : /* Should only get here for VOID functions and procedures */
398 1866 [ - + ]: 139 : Assert(fcache->func->rettype == VOIDOID);
6395 1867 : 139 : fcinfo->isnull = true;
1868 : 139 : result = (Datum) 0;
1869 : : }
1870 : : }
1871 : :
1872 : : /* Pop snapshot if we have pushed one */
5545 1873 [ + + ]: 44835 : if (pushed_snapshot)
1874 : 430 : PopActiveSnapshot();
1875 : :
1876 : : /*
1877 : : * If we've gone through every command in the function, we are done. Reset
1878 : : * state to start over again on next call.
1879 : : */
6395 1880 [ + + ]: 44835 : if (es == NULL)
383 1881 : 43915 : fcache->eslist = NULL;
1882 : :
1883 : : /* Mark fcache as inactive */
258 1884 : 44835 : fcache->active = false;
1885 : :
8317 1886 : 44835 : error_context_stack = sqlerrcontext.previous;
1887 : :
10467 bruce@momjian.us 1888 : 44835 : return result;
1889 : : }
1890 : :
1891 : :
1892 : : /*
1893 : : * error context callback to let us supply a traceback during compile
1894 : : */
1895 : : static void
398 tgl@sss.pgh.pa.us 1896 : 4 : sql_compile_error_callback(void *arg)
1897 : : {
1898 : 4 : SQLFunctionHashEntry *func = (SQLFunctionHashEntry *) arg;
1899 : : int syntaxerrposition;
1900 : :
1901 : : /*
1902 : : * We can do nothing useful if sql_compile_callback() didn't get as far as
1903 : : * copying the function name
1904 : : */
1905 [ - + ]: 4 : if (func->fname == NULL)
5891 tgl@sss.pgh.pa.us 1906 :UBC 0 : return;
1907 : :
1908 : : /*
1909 : : * If there is a syntax error position, convert to internal syntax error
1910 : : */
8080 tgl@sss.pgh.pa.us 1911 :CBC 4 : syntaxerrposition = geterrposition();
398 1912 [ - + - - ]: 4 : if (syntaxerrposition > 0 && func->src != NULL)
1913 : : {
8080 tgl@sss.pgh.pa.us 1914 :UBC 0 : errposition(0);
1915 : 0 : internalerrposition(syntaxerrposition);
398 1916 : 0 : internalerrquery(func->src);
1917 : : }
1918 : :
1919 : : /*
1920 : : * sql_compile_callback() doesn't do any per-query processing, so just
1921 : : * report the context as "during startup".
1922 : : */
398 tgl@sss.pgh.pa.us 1923 :CBC 4 : errcontext("SQL function \"%s\" during startup", func->fname);
1924 : : }
1925 : :
1926 : : /*
1927 : : * error context callback to let us supply a call-stack traceback at runtime
1928 : : */
1929 : : static void
1930 : 5520 : sql_exec_error_callback(void *arg)
1931 : : {
1932 : 5520 : SQLFunctionCachePtr fcache = (SQLFunctionCachePtr) arg;
1933 : : int syntaxerrposition;
1934 : :
1935 : : /*
1936 : : * If there is a syntax error position, convert to internal syntax error
1937 : : */
1938 : 5520 : syntaxerrposition = geterrposition();
1939 [ + + + - ]: 5520 : if (syntaxerrposition > 0 && fcache->func->src != NULL)
1940 : : {
1941 : 1 : errposition(0);
1942 : 1 : internalerrposition(syntaxerrposition);
1943 : 1 : internalerrquery(fcache->func->src);
1944 : : }
1945 : :
1946 : : /*
1947 : : * If we failed while executing an identifiable query within the function,
1948 : : * report that. Otherwise say it was "during startup".
1949 : : */
1950 [ + - ]: 5520 : if (fcache->error_query_index > 0)
1951 : 5520 : errcontext("SQL function \"%s\" statement %d",
1952 : 5520 : fcache->func->fname, fcache->error_query_index);
1953 : : else
398 tgl@sss.pgh.pa.us 1954 :UBC 0 : errcontext("SQL function \"%s\" during startup", fcache->func->fname);
8317 tgl@sss.pgh.pa.us 1955 :CBC 5520 : }
1956 : :
1957 : :
1958 : : /*
1959 : : * ExprContext callback function
1960 : : *
1961 : : * We register this in the active ExprContext while a set-returning SQL
1962 : : * function is running, in case the function needs to be shut down before it
1963 : : * has been run to completion. Note that this will not be called during an
1964 : : * error abort, but we don't need it because transaction abort will take care
1965 : : * of releasing executor resources.
1966 : : */
1967 : : static void
8759 1968 : 4 : ShutdownSQLFunction(Datum arg)
1969 : : {
383 1970 : 4 : SQLFunctionCachePtr fcache = (SQLFunctionCachePtr) DatumGetPointer(arg);
1971 : : execution_state *es;
1972 : :
1973 : 4 : es = fcache->eslist;
1974 [ + + ]: 8 : while (es)
1975 : : {
1976 : : /* Shut down anything still running */
1977 [ + - ]: 4 : if (es->status == F_EXEC_RUN)
1978 : : {
1979 : : /* Re-establish active snapshot for any called functions */
1980 [ + - ]: 4 : if (!fcache->func->readonly_func)
1981 : 4 : PushActiveSnapshot(es->qd->snapshot);
1982 : :
1983 : 4 : postquel_end(es, fcache);
1984 : :
1985 [ + - ]: 4 : if (!fcache->func->readonly_func)
1986 : 4 : PopActiveSnapshot();
1987 : : }
1988 : 4 : es = es->next;
1989 : : }
1990 : 4 : fcache->eslist = NULL;
1991 : :
1992 : : /* Release tuplestore if we have one */
1993 [ - + ]: 4 : if (fcache->tstore)
383 tgl@sss.pgh.pa.us 1994 :UBC 0 : tuplestore_end(fcache->tstore);
383 tgl@sss.pgh.pa.us 1995 :CBC 4 : fcache->tstore = NULL;
1996 : :
1997 : : /* Release CachedPlan if we have one */
1998 [ + - ]: 4 : if (fcache->cplan)
1999 : 4 : ReleaseCachedPlan(fcache->cplan, fcache->cowner);
2000 : 4 : fcache->cplan = NULL;
2001 : :
2002 : : /* execUtils will deregister the callback... */
2003 : 4 : fcache->shutdown_reg = false;
398 2004 : 4 : }
2005 : :
2006 : : /*
2007 : : * MemoryContext callback function
2008 : : *
2009 : : * We register this in the memory context that contains a SQLFunctionCache
2010 : : * struct. When the memory context is reset or deleted, we release the
2011 : : * reference count (if any) that the cache holds on the long-lived hash entry.
2012 : : * Note that this will happen even during error aborts.
2013 : : */
2014 : : static void
383 2015 : 20476 : RemoveSQLFunctionCache(void *arg)
2016 : : {
2017 : 20476 : SQLFunctionCache *fcache = (SQLFunctionCache *) arg;
2018 : :
2019 : : /* Release reference count on SQLFunctionHashEntry */
2020 [ + + ]: 20476 : if (fcache->func != NULL)
2021 : : {
2022 [ - + ]: 20472 : Assert(fcache->func->cfunc.use_count > 0);
2023 : 20472 : fcache->func->cfunc.use_count--;
2024 : : /* This should be unnecessary, but let's just be sure: */
2025 : 20472 : fcache->func = NULL;
2026 : : }
8759 2027 : 20476 : }
2028 : :
2029 : : /*
2030 : : * check_sql_fn_statements
2031 : : *
2032 : : * Check statements in an SQL function. Error out if there is anything that
2033 : : * is not acceptable.
2034 : : */
2035 : : void
2024 2036 : 4332 : check_sql_fn_statements(List *queryTreeLists)
2037 : : {
2038 : : ListCell *lc;
2039 : :
2040 : : /* We are given a list of sublists of Queries */
2041 [ + + + + : 8727 : foreach(lc, queryTreeLists)
+ + ]
2042 : : {
2043 : 4399 : List *sublist = lfirst_node(List, lc);
2044 : :
398 2045 : 4399 : check_sql_fn_statement(sublist);
2046 : : }
2047 : 4328 : }
2048 : :
2049 : : /*
2050 : : * As above, for a single sublist of Queries.
2051 : : */
2052 : : static void
2053 : 6314 : check_sql_fn_statement(List *queryTreeList)
2054 : : {
2055 : : ListCell *lc;
2056 : :
2057 [ + - + + : 12628 : foreach(lc, queryTreeList)
+ + ]
2058 : : {
2059 : 6318 : Query *query = lfirst_node(Query, lc);
2060 : :
2061 : : /*
2062 : : * Disallow calling procedures with output arguments. The current
2063 : : * implementation would just throw the output values away, unless the
2064 : : * statement is the last one. Per SQL standard, we should assign the
2065 : : * output values by name. By disallowing this here, we preserve an
2066 : : * opportunity for future improvement.
2067 : : */
2068 [ + + ]: 6318 : if (query->commandType == CMD_UTILITY &&
2069 [ + + ]: 100 : IsA(query->utilityStmt, CallStmt))
2070 : : {
2071 : 20 : CallStmt *stmt = (CallStmt *) query->utilityStmt;
2072 : :
2073 [ + + ]: 20 : if (stmt->outargs != NIL)
2074 [ + - ]: 4 : ereport(ERROR,
2075 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2076 : : errmsg("calling procedures with output arguments is not supported in SQL functions")));
2077 : : }
2078 : : }
2974 peter_e@gmx.net 2079 : 6310 : }
2080 : :
2081 : : /*
2082 : : * check_sql_fn_retval()
2083 : : * Check return value of a list of lists of sql parse trees.
2084 : : *
2085 : : * The return value of a sql function is the value returned by the last
2086 : : * canSetTag query in the function. We do some ad-hoc type checking and
2087 : : * coercion here to ensure that the function returns what it's supposed to.
2088 : : * Note that we may actually modify the last query to make it match!
2089 : : *
2090 : : * This function returns true if the sql function returns the entire tuple
2091 : : * result of its final statement, or false if it returns just the first column
2092 : : * result of that statement. It throws an error if the final statement doesn't
2093 : : * return the right type at all.
2094 : : *
2095 : : * Note that because we allow "SELECT rowtype_expression", the result can be
2096 : : * false even when the declared function return type is a rowtype.
2097 : : *
2098 : : * For a polymorphic function the passed rettype must be the actual resolved
2099 : : * output type of the function. (This means we can't check the type during
2100 : : * function definition of a polymorphic function.) If we do see a polymorphic
2101 : : * rettype we'll throw an error, saying it is not a supported rettype.
2102 : : *
2103 : : * If the function returns composite, the passed rettupdesc should describe
2104 : : * the expected output. If rettupdesc is NULL, we can't verify that the
2105 : : * output matches; that should only happen in fmgr_sql_validator(), or when
2106 : : * the function returns RECORD and the caller doesn't actually care which
2107 : : * composite type it is.
2108 : : *
2109 : : * (Typically, rettype and rettupdesc are computed by get_call_result_type
2110 : : * or a sibling function.)
2111 : : *
2112 : : * In addition to coercing individual output columns, we can modify the
2113 : : * output to include dummy NULL columns for any dropped columns appearing
2114 : : * in rettupdesc. This is done only if the caller asks for it.
2115 : : */
2116 : : bool
2024 tgl@sss.pgh.pa.us 2117 : 7128 : check_sql_fn_retval(List *queryTreeLists,
2118 : : Oid rettype, TupleDesc rettupdesc,
2119 : : char prokind,
2120 : : bool insertDroppedCols)
2121 : : {
2122 : : List *queryTreeList;
2123 : :
2124 : : /*
2125 : : * We consider only the last sublist of Query nodes, so that only the last
2126 : : * original statement is a candidate to produce the result. This is a
2127 : : * change from pre-v18 versions, which would back up to the last statement
2128 : : * that includes a canSetTag query, thus ignoring any ending statement(s)
2129 : : * that rewrite to DO INSTEAD NOTHING. That behavior was undocumented and
2130 : : * there seems no good reason for it, except that it was an artifact of
2131 : : * the original coding.
2132 : : *
2133 : : * If the function body is completely empty, handle that the same as if
2134 : : * the last query had rewritten to nothing.
2135 : : */
398 2136 [ + + ]: 7128 : if (queryTreeLists != NIL)
2137 : 7112 : queryTreeList = llast_node(List, queryTreeLists);
2138 : : else
2139 : 16 : queryTreeList = NIL;
2140 : :
2141 : 7128 : return check_sql_stmt_retval(queryTreeList,
2142 : : rettype, rettupdesc,
2143 : : prokind, insertDroppedCols);
2144 : : }
2145 : :
2146 : : /*
2147 : : * As for check_sql_fn_retval, but we are given just the last query's
2148 : : * rewritten-queries list.
2149 : : */
2150 : : static bool
2151 : 8997 : check_sql_stmt_retval(List *queryTreeList,
2152 : : Oid rettype, TupleDesc rettupdesc,
2153 : : char prokind, bool insertDroppedCols)
2154 : : {
2309 2155 : 8997 : bool is_tuple_result = false;
2156 : : Query *parse;
2157 : : ListCell *parse_cell;
2158 : : List *tlist;
2159 : : int tlistlen;
2160 : : bool tlist_is_modifiable;
2161 : : char fn_typtype;
2162 : 8997 : List *upper_tlist = NIL;
2163 : 8997 : bool upper_tlist_nontrivial = false;
2164 : : ListCell *lc;
2165 : :
2166 : : /*
2167 : : * If it's declared to return VOID, we don't care what's in the function.
2168 : : * (This takes care of procedures with no output parameters, as well.)
2169 : : */
2986 peter_e@gmx.net 2170 [ + + ]: 8997 : if (rettype == VOIDOID)
3078 2171 : 405 : return false;
2172 : :
2173 : : /*
2174 : : * Find the last canSetTag query in the list of Query nodes. This isn't
2175 : : * necessarily the last parsetree, because rule rewriting can insert
2176 : : * queries after what the user wrote.
2177 : : */
6395 tgl@sss.pgh.pa.us 2178 : 8592 : parse = NULL;
2309 2179 : 8592 : parse_cell = NULL;
398 2180 [ + + + + : 17184 : foreach(lc, queryTreeList)
+ + ]
2181 : : {
2182 : 8592 : Query *q = lfirst_node(Query, lc);
2183 : :
2184 [ + + ]: 8592 : if (q->canSetTag)
2185 : : {
2186 : 8588 : parse = q;
2187 : 8588 : parse_cell = lc;
2188 : : }
2189 : : }
2190 : :
2191 : : /*
2192 : : * If it's a plain SELECT, it returns whatever the targetlist says.
2193 : : * Otherwise, if it's INSERT/UPDATE/DELETE/MERGE with RETURNING, it
2194 : : * returns that. Otherwise, the function return type must be VOID.
2195 : : *
2196 : : * Note: eventually replace this test with QueryReturnsTuples? We'd need
2197 : : * a more general method of determining the output type, though. Also, it
2198 : : * seems too dangerous to consider FETCH or EXECUTE as returning a
2199 : : * determinable rowtype, since they depend on relatively short-lived
2200 : : * entities.
2201 : : */
6395 2202 [ + + ]: 8592 : if (parse &&
3398 2203 [ + + ]: 8588 : parse->commandType == CMD_SELECT)
2204 : : {
6395 2205 : 8493 : tlist = parse->targetList;
2206 : : /* tlist is modifiable unless it's a dummy in a setop query */
2309 2207 : 8493 : tlist_is_modifiable = (parse->setOperations == NULL);
2208 : : }
6395 2209 [ + + ]: 99 : else if (parse &&
2210 [ + + ]: 95 : (parse->commandType == CMD_INSERT ||
2211 [ + + ]: 39 : parse->commandType == CMD_UPDATE ||
779 dean.a.rasheed@gmail 2212 [ + + ]: 28 : parse->commandType == CMD_DELETE ||
2213 [ + - ]: 20 : parse->commandType == CMD_MERGE) &&
6395 tgl@sss.pgh.pa.us 2214 [ + - ]: 95 : parse->returningList)
2215 : : {
2216 : 95 : tlist = parse->returningList;
2217 : : /* returningList can always be modified */
2309 2218 : 95 : tlist_is_modifiable = true;
2219 : : }
2220 : : else
2221 : : {
2222 : : /* Last statement is a utility command, or it rewrote to nothing */
2986 peter_e@gmx.net 2223 [ + - ]: 4 : ereport(ERROR,
2224 : : (errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
2225 : : errmsg("return type mismatch in function declared to return %s",
2226 : : format_type_be(rettype)),
2227 : : errdetail("Function's final statement must be SELECT or INSERT/UPDATE/DELETE/MERGE RETURNING.")));
2228 : : return false; /* keep compiler quiet */
2229 : : }
2230 : :
2231 : : /*
2232 : : * OK, check that the targetlist returns something matching the declared
2233 : : * type, and modify it if necessary. If possible, we insert any coercion
2234 : : * steps right into the final statement's targetlist. However, that might
2235 : : * risk changes in the statement's semantics --- we can't safely change
2236 : : * the output type of a grouping column, for instance. In such cases we
2237 : : * handle coercions by inserting an extra level of Query that effectively
2238 : : * just does a projection.
2239 : : */
2240 : :
2241 : : /*
2242 : : * Count the non-junk entries in the result targetlist.
2243 : : */
7880 tgl@sss.pgh.pa.us 2244 : 8588 : tlistlen = ExecCleanTargetListLength(tlist);
2245 : :
7705 2246 : 8588 : fn_typtype = get_typtype(rettype);
2247 : :
6973 2248 [ + + + + ]: 8588 : if (fn_typtype == TYPTYPE_BASE ||
2249 [ + + ]: 1062 : fn_typtype == TYPTYPE_DOMAIN ||
2250 [ + + ]: 1058 : fn_typtype == TYPTYPE_ENUM ||
1962 akorotkov@postgresql 2251 [ + + ]: 1028 : fn_typtype == TYPTYPE_RANGE ||
2252 : : fn_typtype == TYPTYPE_MULTIRANGE)
7880 tgl@sss.pgh.pa.us 2253 : 7582 : {
2254 : : /*
2255 : : * For scalar-type returns, the target list must have exactly one
2256 : : * non-junk entry, and its type must be coercible to rettype.
2257 : : */
2258 : : TargetEntry *tle;
2259 : :
2260 [ + + ]: 7590 : if (tlistlen != 1)
2261 [ + - ]: 4 : ereport(ERROR,
2262 : : (errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
2263 : : errmsg("return type mismatch in function declared to return %s",
2264 : : format_type_be(rettype)),
2265 : : errdetail("Final statement must return exactly one column.")));
2266 : :
2267 : : /* We assume here that non-junk TLEs must come first in tlists */
6622 2268 : 7586 : tle = (TargetEntry *) linitial(tlist);
2269 [ - + ]: 7586 : Assert(!tle->resjunk);
2270 : :
2309 2271 [ + + ]: 7586 : if (!coerce_fn_result_column(tle, rettype, -1,
2272 : : tlist_is_modifiable,
2273 : : &upper_tlist,
2274 : : &upper_tlist_nontrivial))
7880 2275 [ + - ]: 4 : ereport(ERROR,
2276 : : (errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
2277 : : errmsg("return type mismatch in function declared to return %s",
2278 : : format_type_be(rettype)),
2279 : : errdetail("Actual return type is %s.",
2280 : : format_type_be(exprType((Node *) tle->expr)))));
2281 : : }
6973 2282 [ + + + + ]: 998 : else if (fn_typtype == TYPTYPE_COMPOSITE || rettype == RECORDOID)
7880 2283 : 882 : {
2284 : : /*
2285 : : * Returns a rowtype.
2286 : : *
2287 : : * Note that we will not consider a domain over composite to be a
2288 : : * "rowtype" return type; it goes through the scalar case above. This
2289 : : * is because we only provide column-by-column implicit casting, and
2290 : : * will not cast the complete record result. So the only way to
2291 : : * produce a domain-over-composite result is to compute it as an
2292 : : * explicit single-column result. The single-composite-column code
2293 : : * path just below could handle such cases, but it won't be reached.
2294 : : */
2295 : : int tupnatts; /* physical number of columns in tuple */
2296 : : int tuplogcols; /* # of nondeleted columns in tuple */
2297 : : int colindex; /* physical column index */
2298 : :
2299 : : /*
2300 : : * If the target list has one non-junk entry, and that expression has
2301 : : * or can be coerced to the declared return type, take it as the
2302 : : * result. This allows, for example, 'SELECT func2()', where func2
2303 : : * has the same composite return type as the function that's calling
2304 : : * it. This provision creates some ambiguity --- maybe the expression
2305 : : * was meant to be the lone field of the composite result --- but it
2306 : : * works well enough as long as we don't get too enthusiastic about
2307 : : * inventing coercions from scalar to composite types.
2308 : : *
2309 : : * XXX Note that if rettype is RECORD and the expression is of a named
2310 : : * composite type, or vice versa, this coercion will succeed, whether
2311 : : * or not the record type really matches. For the moment we rely on
2312 : : * runtime type checking to catch any discrepancy, but it'd be nice to
2313 : : * do better at parse time.
2314 : : *
2315 : : * We must *not* do this for a procedure, however. Procedures with
2316 : : * output parameter(s) have rettype RECORD, and the CALL code expects
2317 : : * to get results corresponding to the list of output parameters, even
2318 : : * when there's just one parameter that's composite.
2319 : : */
784 2320 [ + + + + ]: 994 : if (tlistlen == 1 && prokind != PROKIND_PROCEDURE)
2321 : : {
6622 2322 : 182 : TargetEntry *tle = (TargetEntry *) linitial(tlist);
2323 : :
2324 [ - + ]: 182 : Assert(!tle->resjunk);
2309 2325 [ + + ]: 182 : if (coerce_fn_result_column(tle, rettype, -1,
2326 : : tlist_is_modifiable,
2327 : : &upper_tlist,
2328 : : &upper_tlist_nontrivial))
2329 : : {
2330 : : /* Note that we're NOT setting is_tuple_result */
2331 : 72 : goto tlist_coercion_finished;
2332 : : }
2333 : : }
2334 : :
2335 : : /*
2336 : : * If the caller didn't provide an expected tupdesc, we can't do any
2337 : : * further checking. Assume we're returning the whole tuple.
2338 : : */
2339 [ + + ]: 922 : if (rettupdesc == NULL)
7705 2340 : 32 : return true;
2341 : :
2342 : : /*
2343 : : * Verify that the targetlist matches the return tuple type. We scan
2344 : : * the non-resjunk columns, and coerce them if necessary to match the
2345 : : * datatypes of the non-deleted attributes. For deleted attributes,
2346 : : * insert NULL result columns if the caller asked for that.
2347 : : */
2309 2348 : 890 : tupnatts = rettupdesc->natts;
7705 2349 : 890 : tuplogcols = 0; /* we'll count nondeleted cols as we go */
7880 2350 : 890 : colindex = 0;
2351 : :
6395 2352 [ + - + + : 3671 : foreach(lc, tlist)
+ + ]
2353 : : {
2354 : 2789 : TargetEntry *tle = (TargetEntry *) lfirst(lc);
2355 : : Form_pg_attribute attr;
2356 : :
2357 : : /* resjunk columns can simply be ignored */
7699 2358 [ - + ]: 2789 : if (tle->resjunk)
7880 tgl@sss.pgh.pa.us 2359 :UBC 0 : continue;
2360 : :
2361 : : do
2362 : : {
7880 tgl@sss.pgh.pa.us 2363 :CBC 2826 : colindex++;
7705 2364 [ - + ]: 2826 : if (colindex > tupnatts)
7880 tgl@sss.pgh.pa.us 2365 [ # # ]:UBC 0 : ereport(ERROR,
2366 : : (errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
2367 : : errmsg("return type mismatch in function declared to return %s",
2368 : : format_type_be(rettype)),
2369 : : errdetail("Final statement returns too many columns.")));
2309 tgl@sss.pgh.pa.us 2370 :CBC 2826 : attr = TupleDescAttr(rettupdesc, colindex - 1);
2371 [ + + + + ]: 2826 : if (attr->attisdropped && insertDroppedCols)
2372 : : {
2373 : : Expr *null_expr;
2374 : :
2375 : : /* The type of the null we insert isn't important */
5986 2376 : 5 : null_expr = (Expr *) makeConst(INT4OID,
2377 : : -1,
2378 : : InvalidOid,
2379 : : sizeof(int32),
2380 : : (Datum) 0,
2381 : : true, /* isnull */
2382 : : true /* byval */ );
2309 2383 : 5 : upper_tlist = lappend(upper_tlist,
2384 : 5 : makeTargetEntry(null_expr,
2385 : 5 : list_length(upper_tlist) + 1,
2386 : : NULL,
2387 : : false));
2388 : 5 : upper_tlist_nontrivial = true;
2389 : : }
7880 2390 [ + + ]: 2826 : } while (attr->attisdropped);
7705 2391 : 2789 : tuplogcols++;
2392 : :
2309 2393 [ + + ]: 2789 : if (!coerce_fn_result_column(tle,
2394 : : attr->atttypid, attr->atttypmod,
2395 : : tlist_is_modifiable,
2396 : : &upper_tlist,
2397 : : &upper_tlist_nontrivial))
7880 2398 [ + - ]: 8 : ereport(ERROR,
2399 : : (errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
2400 : : errmsg("return type mismatch in function declared to return %s",
2401 : : format_type_be(rettype)),
2402 : : errdetail("Final statement returns %s instead of %s at column %d.",
2403 : : format_type_be(exprType((Node *) tle->expr)),
2404 : : format_type_be(attr->atttypid),
2405 : : tuplogcols)));
2406 : : }
2407 : :
2408 : : /* remaining columns in rettupdesc had better all be dropped */
5986 2409 [ - + ]: 882 : for (colindex++; colindex <= tupnatts; colindex++)
2410 : : {
501 drowley@postgresql.o 2411 [ # # ]:UBC 0 : if (!TupleDescCompactAttr(rettupdesc, colindex - 1)->attisdropped)
5986 tgl@sss.pgh.pa.us 2412 [ # # ]: 0 : ereport(ERROR,
2413 : : (errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
2414 : : errmsg("return type mismatch in function declared to return %s",
2415 : : format_type_be(rettype)),
2416 : : errdetail("Final statement returns too few columns.")));
2309 2417 [ # # ]: 0 : if (insertDroppedCols)
2418 : : {
2419 : : Expr *null_expr;
2420 : :
2421 : : /* The type of the null we insert isn't important */
5986 2422 : 0 : null_expr = (Expr *) makeConst(INT4OID,
2423 : : -1,
2424 : : InvalidOid,
2425 : : sizeof(int32),
2426 : : (Datum) 0,
2427 : : true, /* isnull */
2428 : : true /* byval */ );
2309 2429 : 0 : upper_tlist = lappend(upper_tlist,
2430 : 0 : makeTargetEntry(null_expr,
2431 : 0 : list_length(upper_tlist) + 1,
2432 : : NULL,
2433 : : false));
2434 : 0 : upper_tlist_nontrivial = true;
2435 : : }
2436 : : }
2437 : :
2438 : : /* Report that we are returning entire tuple result */
2309 tgl@sss.pgh.pa.us 2439 :CBC 882 : is_tuple_result = true;
2440 : : }
2441 : : else
7880 2442 [ + - ]: 4 : ereport(ERROR,
2443 : : (errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
2444 : : errmsg("return type %s is not supported for SQL functions",
2445 : : format_type_be(rettype))));
2446 : :
2309 2447 : 8536 : tlist_coercion_finished:
2448 : :
2449 : : /*
2450 : : * If necessary, modify the final Query by injecting an extra Query level
2451 : : * that just performs a projection. (It'd be dubious to do this to a
2452 : : * non-SELECT query, but we never have to; RETURNING lists can always be
2453 : : * modified in-place.)
2454 : : */
2455 [ + + ]: 8536 : if (upper_tlist_nontrivial)
2456 : : {
2457 : : Query *newquery;
2458 : : List *colnames;
2459 : : RangeTblEntry *rte;
2460 : : RangeTblRef *rtr;
2461 : :
2462 [ - + ]: 71 : Assert(parse->commandType == CMD_SELECT);
2463 : :
2464 : : /* Most of the upper Query struct can be left as zeroes/nulls */
2465 : 71 : newquery = makeNode(Query);
2466 : 71 : newquery->commandType = CMD_SELECT;
2467 : 71 : newquery->querySource = parse->querySource;
2468 : 71 : newquery->canSetTag = true;
2469 : 71 : newquery->targetList = upper_tlist;
2470 : :
2471 : : /* We need a moderately realistic colnames list for the subquery RTE */
2472 : 71 : colnames = NIL;
2473 [ + - + + : 204 : foreach(lc, parse->targetList)
+ + ]
2474 : : {
2475 : 133 : TargetEntry *tle = (TargetEntry *) lfirst(lc);
2476 : :
2477 [ - + ]: 133 : if (tle->resjunk)
2309 tgl@sss.pgh.pa.us 2478 :UBC 0 : continue;
2309 tgl@sss.pgh.pa.us 2479 :CBC 133 : colnames = lappend(colnames,
2480 [ + - ]: 133 : makeString(tle->resname ? tle->resname : ""));
2481 : : }
2482 : :
2483 : : /* Build a suitable RTE for the subquery */
2484 : 71 : rte = makeNode(RangeTblEntry);
2485 : 71 : rte->rtekind = RTE_SUBQUERY;
2486 : 71 : rte->subquery = parse;
239 rhaas@postgresql.org 2487 :GNC 71 : rte->eref = makeAlias("unnamed_subquery", colnames);
2309 tgl@sss.pgh.pa.us 2488 :CBC 71 : rte->lateral = false;
2489 : 71 : rte->inh = false;
2490 : 71 : rte->inFromCl = true;
2491 : 71 : newquery->rtable = list_make1(rte);
2492 : :
2493 : 71 : rtr = makeNode(RangeTblRef);
2494 : 71 : rtr->rtindex = 1;
2495 : 71 : newquery->jointree = makeFromExpr(list_make1(rtr), NULL);
2496 : :
2497 : : /*
2498 : : * Make sure the new query is marked as having row security if the
2499 : : * original one does.
2500 : : */
540 nathan@postgresql.or 2501 : 71 : newquery->hasRowSecurity = parse->hasRowSecurity;
2502 : :
2503 : : /* Replace original query in the correct element of the query list */
2309 tgl@sss.pgh.pa.us 2504 : 71 : lfirst(parse_cell) = newquery;
2505 : : }
2506 : :
2507 : 8536 : return is_tuple_result;
2508 : : }
2509 : :
2510 : : /*
2511 : : * Process one function result column for check_sql_fn_retval
2512 : : *
2513 : : * Coerce the output value to the required type/typmod, and add a column
2514 : : * to *upper_tlist for it. Set *upper_tlist_nontrivial to true if we
2515 : : * add an upper tlist item that's not just a Var.
2516 : : *
2517 : : * Returns true if OK, false if could not coerce to required type
2518 : : * (in which case, no changes have been made)
2519 : : */
2520 : : static bool
2521 : 10557 : coerce_fn_result_column(TargetEntry *src_tle,
2522 : : Oid res_type,
2523 : : int32 res_typmod,
2524 : : bool tlist_is_modifiable,
2525 : : List **upper_tlist,
2526 : : bool *upper_tlist_nontrivial)
2527 : : {
2528 : : TargetEntry *new_tle;
2529 : : Expr *new_tle_expr;
2530 : : Node *cast_result;
2531 : :
2532 : : /*
2533 : : * If the TLE has a sortgroupref marking, don't change it, as it probably
2534 : : * is referenced by ORDER BY, DISTINCT, etc, and changing its type would
2535 : : * break query semantics. Otherwise, it's safe to modify in-place unless
2536 : : * the query as a whole has issues with that.
2537 : : */
2538 [ + + + + ]: 10557 : if (tlist_is_modifiable && src_tle->ressortgroupref == 0)
2539 : : {
2540 : : /* OK to modify src_tle in place, if necessary */
2541 : 20668 : cast_result = coerce_to_target_type(NULL,
2542 : 10334 : (Node *) src_tle->expr,
2543 : 10334 : exprType((Node *) src_tle->expr),
2544 : : res_type, res_typmod,
2545 : : COERCION_ASSIGNMENT,
2546 : : COERCE_IMPLICIT_CAST,
2547 : : -1);
2548 [ + + ]: 10334 : if (cast_result == NULL)
2549 : 108 : return false;
2212 2550 : 10226 : assign_expr_collations(NULL, cast_result);
2309 2551 : 10226 : src_tle->expr = (Expr *) cast_result;
2552 : : /* Make a Var referencing the possibly-modified TLE */
2553 : 10226 : new_tle_expr = (Expr *) makeVarFromTargetEntry(1, src_tle);
2554 : : }
2555 : : else
2556 : : {
2557 : : /* Any casting must happen in the upper tlist */
2558 : 223 : Var *var = makeVarFromTargetEntry(1, src_tle);
2559 : :
2560 : 223 : cast_result = coerce_to_target_type(NULL,
2561 : : (Node *) var,
2562 : : var->vartype,
2563 : : res_type, res_typmod,
2564 : : COERCION_ASSIGNMENT,
2565 : : COERCE_IMPLICIT_CAST,
2566 : : -1);
2567 [ + + ]: 223 : if (cast_result == NULL)
2568 : 14 : return false;
2212 2569 : 209 : assign_expr_collations(NULL, cast_result);
2570 : : /* Did the coercion actually do anything? */
2309 2571 [ + + ]: 209 : if (cast_result != (Node *) var)
2572 : 84 : *upper_tlist_nontrivial = true;
2573 : 209 : new_tle_expr = (Expr *) cast_result;
2574 : : }
2575 : 20870 : new_tle = makeTargetEntry(new_tle_expr,
2576 : 10435 : list_length(*upper_tlist) + 1,
2577 : : src_tle->resname, false);
2578 : 10435 : *upper_tlist = lappend(*upper_tlist, new_tle);
2579 : 10435 : return true;
2580 : : }
2581 : :
2582 : : /*
2583 : : * Extract the targetlist of the last canSetTag query in the given list
2584 : : * of parsed-and-rewritten Queries. Returns NIL if there is none.
2585 : : */
2586 : : static List *
398 2587 : 21720 : get_sql_fn_result_tlist(List *queryTreeList)
2588 : : {
2589 : 21720 : Query *parse = NULL;
2590 : : ListCell *lc;
2591 : :
2592 [ + - + + : 43444 : foreach(lc, queryTreeList)
+ + ]
2593 : : {
2594 : 21724 : Query *q = lfirst_node(Query, lc);
2595 : :
2596 [ + + ]: 21724 : if (q->canSetTag)
2597 : 21720 : parse = q;
2598 : : }
2599 [ + - ]: 21720 : if (parse &&
2600 [ + + ]: 21720 : parse->commandType == CMD_SELECT)
2601 : 21644 : return parse->targetList;
2602 [ + - ]: 76 : else if (parse &&
2603 [ + + ]: 76 : (parse->commandType == CMD_INSERT ||
2604 [ + + ]: 28 : parse->commandType == CMD_UPDATE ||
2605 [ + - ]: 16 : parse->commandType == CMD_DELETE ||
2606 [ + - ]: 16 : parse->commandType == CMD_MERGE) &&
2607 [ + - ]: 76 : parse->returningList)
2608 : 76 : return parse->returningList;
2609 : : else
398 tgl@sss.pgh.pa.us 2610 :UBC 0 : return NIL;
2611 : : }
2612 : :
2613 : :
2614 : : /*
2615 : : * CreateSQLFunctionDestReceiver -- create a suitable DestReceiver object
2616 : : */
2617 : : DestReceiver *
6395 tgl@sss.pgh.pa.us 2618 :CBC 49158 : CreateSQLFunctionDestReceiver(void)
2619 : : {
146 michael@paquier.xyz 2620 :GNC 49158 : DR_sqlfunction *self = palloc0_object(DR_sqlfunction);
2621 : :
6395 tgl@sss.pgh.pa.us 2622 :CBC 49158 : self->pub.receiveSlot = sqlfunction_receive;
2623 : 49158 : self->pub.rStartup = sqlfunction_startup;
2624 : 49158 : self->pub.rShutdown = sqlfunction_shutdown;
2625 : 49158 : self->pub.rDestroy = sqlfunction_destroy;
2626 : 49158 : self->pub.mydest = DestSQLFunction;
2627 : :
2628 : : /* private fields will be set by postquel_start */
2629 : :
2630 : 49158 : return (DestReceiver *) self;
2631 : : }
2632 : :
2633 : : /*
2634 : : * sqlfunction_startup --- executor startup
2635 : : */
2636 : : static void
2637 : 50062 : sqlfunction_startup(DestReceiver *self, int operation, TupleDesc typeinfo)
2638 : : {
2639 : : /* no-op */
2640 : 50062 : }
2641 : :
2642 : : /*
2643 : : * sqlfunction_receive --- receive one tuple
2644 : : */
2645 : : static bool
2646 : 119414 : sqlfunction_receive(TupleTableSlot *slot, DestReceiver *self)
2647 : : {
2648 : 119414 : DR_sqlfunction *myState = (DR_sqlfunction *) self;
2649 : :
368 2650 [ + + ]: 119414 : if (myState->tstore)
2651 : : {
2652 : : /* We are collecting all of a set result into the tuplestore */
2653 : :
2654 : : /* Filter tuple as needed */
2655 : 81640 : slot = ExecFilterJunk(myState->filter, slot);
2656 : :
2657 : : /* Store the filtered tuple into the tuplestore */
2658 : 81640 : tuplestore_puttupleslot(myState->tstore, slot);
2659 : : }
2660 : : else
2661 : : {
2662 : : /*
2663 : : * We only want the first tuple, which we'll save in the junkfilter's
2664 : : * result slot. Ignore any additional tuples passed.
2665 : : */
2666 [ + + ]: 37774 : if (TTS_EMPTY(myState->filter->jf_resultSlot))
2667 : : {
2668 : : /* Filter tuple as needed */
2669 : 37770 : slot = ExecFilterJunk(myState->filter, slot);
2670 [ - + ]: 37770 : Assert(slot == myState->filter->jf_resultSlot);
2671 : :
2672 : : /* Materialize the slot so it preserves pass-by-ref values */
2673 : 37770 : ExecMaterializeSlot(slot);
2674 : : }
2675 : : }
2676 : :
3620 rhaas@postgresql.org 2677 : 119414 : return true;
2678 : : }
2679 : :
2680 : : /*
2681 : : * sqlfunction_shutdown --- executor end
2682 : : */
2683 : : static void
6395 tgl@sss.pgh.pa.us 2684 : 44692 : sqlfunction_shutdown(DestReceiver *self)
2685 : : {
2686 : : /* no-op */
2687 : 44692 : }
2688 : :
2689 : : /*
2690 : : * sqlfunction_destroy --- release DestReceiver object
2691 : : */
2692 : : static void
2693 : 43776 : sqlfunction_destroy(DestReceiver *self)
2694 : : {
2695 : 43776 : pfree(self);
2696 : 43776 : }
|
