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functions.c
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1 /*-------------------------------------------------------------------------
2  *
3  * functions.c
4  * Execution of SQL-language functions
5  *
6  * Portions Copyright (c) 1996-2017, 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_func.h"
28 #include "storage/proc.h"
29 #include "tcop/utility.h"
30 #include "utils/builtins.h"
31 #include "utils/datum.h"
32 #include "utils/lsyscache.h"
33 #include "utils/memutils.h"
34 #include "utils/snapmgr.h"
35 #include "utils/syscache.h"
36 
37 
38 /*
39  * Specialized DestReceiver for collecting query output in a SQL function
40  */
41 typedef struct
42 {
43  DestReceiver pub; /* publicly-known function pointers */
44  Tuplestorestate *tstore; /* where to put result tuples */
45  MemoryContext cxt; /* context containing tstore */
46  JunkFilter *filter; /* filter to convert tuple type */
48 
49 /*
50  * We have an execution_state record for each query in a function. Each
51  * record contains a plantree for its query. If the query is currently in
52  * F_EXEC_RUN state then there's a QueryDesc too.
53  *
54  * The "next" fields chain together all the execution_state records generated
55  * from a single original parsetree. (There will only be more than one in
56  * case of rule expansion of the original parsetree.)
57  */
58 typedef enum
59 {
61 } ExecStatus;
62 
63 typedef struct execution_state
64 {
67  bool setsResult; /* true if this query produces func's result */
68  bool lazyEval; /* true if should fetch one row at a time */
69  PlannedStmt *stmt; /* plan for this query */
70  QueryDesc *qd; /* null unless status == RUN */
72 
73 
74 /*
75  * An SQLFunctionCache record is built during the first call,
76  * and linked to from the fn_extra field of the FmgrInfo struct.
77  *
78  * Note that currently this has only the lifespan of the calling query.
79  * Someday we should rewrite this code to use plancache.c to save parse/plan
80  * results for longer than that.
81  *
82  * Physically, though, the data has the lifespan of the FmgrInfo that's used
83  * to call the function, and there are cases (particularly with indexes)
84  * where the FmgrInfo might survive across transactions. We cannot assume
85  * that the parse/plan trees are good for longer than the (sub)transaction in
86  * which parsing was done, so we must mark the record with the LXID/subxid of
87  * its creation time, and regenerate everything if that's obsolete. To avoid
88  * memory leakage when we do have to regenerate things, all the data is kept
89  * in a sub-context of the FmgrInfo's fn_mcxt.
90  */
91 typedef struct
92 {
93  char *fname; /* function name (for error msgs) */
94  char *src; /* function body text (for error msgs) */
95 
96  SQLFunctionParseInfoPtr pinfo; /* data for parser callback hooks */
97 
98  Oid rettype; /* actual return type */
99  int16 typlen; /* length of the return type */
100  bool typbyval; /* true if return type is pass by value */
101  bool returnsSet; /* true if returning multiple rows */
102  bool returnsTuple; /* true if returning whole tuple result */
103  bool shutdown_reg; /* true if registered shutdown callback */
104  bool readonly_func; /* true to run in "read only" mode */
105  bool lazyEval; /* true if using lazyEval for result query */
106 
107  ParamListInfo paramLI; /* Param list representing current args */
108 
109  Tuplestorestate *tstore; /* where we accumulate result tuples */
110 
111  JunkFilter *junkFilter; /* will be NULL if function returns VOID */
112 
113  /*
114  * func_state is a List of execution_state records, each of which is the
115  * first for its original parsetree, with any additional records chained
116  * to it via the "next" fields. This sublist structure is needed to keep
117  * track of where the original query boundaries are.
118  */
120 
121  MemoryContext fcontext; /* memory context holding this struct and all
122  * subsidiary data */
123 
124  LocalTransactionId lxid; /* lxid in which cache was made */
125  SubTransactionId subxid; /* subxid in which cache was made */
127 
129 
130 /*
131  * Data structure needed by the parser callback hooks to resolve parameter
132  * references during parsing of a SQL function's body. This is separate from
133  * SQLFunctionCache since we sometimes do parsing separately from execution.
134  */
135 typedef struct SQLFunctionParseInfo
136 {
137  char *fname; /* function's name */
138  int nargs; /* number of input arguments */
139  Oid *argtypes; /* resolved types of input arguments */
140  char **argnames; /* names of input arguments; NULL if none */
141  /* Note that argnames[i] can be NULL, if some args are unnamed */
142  Oid collation; /* function's input collation, if known */
144 
145 
146 /* non-export function prototypes */
147 static Node *sql_fn_param_ref(ParseState *pstate, ParamRef *pref);
148 static Node *sql_fn_post_column_ref(ParseState *pstate,
149  ColumnRef *cref, Node *var);
151  int paramno, int location);
153  const char *paramname, int location);
154 static List *init_execution_state(List *queryTree_list,
155  SQLFunctionCachePtr fcache,
156  bool lazyEvalOK);
157 static void init_sql_fcache(FmgrInfo *finfo, Oid collation, bool lazyEvalOK);
158 static void postquel_start(execution_state *es, SQLFunctionCachePtr fcache);
159 static bool postquel_getnext(execution_state *es, SQLFunctionCachePtr fcache);
160 static void postquel_end(execution_state *es);
161 static void postquel_sub_params(SQLFunctionCachePtr fcache,
162  FunctionCallInfo fcinfo);
164  FunctionCallInfo fcinfo,
165  SQLFunctionCachePtr fcache,
166  MemoryContext resultcontext);
167 static void sql_exec_error_callback(void *arg);
168 static void ShutdownSQLFunction(Datum arg);
169 static void sqlfunction_startup(DestReceiver *self, int operation, TupleDesc typeinfo);
170 static bool sqlfunction_receive(TupleTableSlot *slot, DestReceiver *self);
171 static void sqlfunction_shutdown(DestReceiver *self);
172 static void sqlfunction_destroy(DestReceiver *self);
173 
174 
175 /*
176  * Prepare the SQLFunctionParseInfo struct for parsing a SQL function body
177  *
178  * This includes resolving actual types of polymorphic arguments.
179  *
180  * call_expr can be passed as NULL, but then we will fail if there are any
181  * polymorphic arguments.
182  */
185  Node *call_expr,
186  Oid inputCollation)
187 {
189  Form_pg_proc procedureStruct = (Form_pg_proc) GETSTRUCT(procedureTuple);
190  int nargs;
191 
193 
194  /* Function's name (only) can be used to qualify argument names */
195  pinfo->fname = pstrdup(NameStr(procedureStruct->proname));
196 
197  /* Save the function's input collation */
198  pinfo->collation = inputCollation;
199 
200  /*
201  * Copy input argument types from the pg_proc entry, then resolve any
202  * polymorphic types.
203  */
204  pinfo->nargs = nargs = procedureStruct->pronargs;
205  if (nargs > 0)
206  {
207  Oid *argOidVect;
208  int argnum;
209 
210  argOidVect = (Oid *) palloc(nargs * sizeof(Oid));
211  memcpy(argOidVect,
212  procedureStruct->proargtypes.values,
213  nargs * sizeof(Oid));
214 
215  for (argnum = 0; argnum < nargs; argnum++)
216  {
217  Oid argtype = argOidVect[argnum];
218 
219  if (IsPolymorphicType(argtype))
220  {
221  argtype = get_call_expr_argtype(call_expr, argnum);
222  if (argtype == InvalidOid)
223  ereport(ERROR,
224  (errcode(ERRCODE_DATATYPE_MISMATCH),
225  errmsg("could not determine actual type of argument declared %s",
226  format_type_be(argOidVect[argnum]))));
227  argOidVect[argnum] = argtype;
228  }
229  }
230 
231  pinfo->argtypes = argOidVect;
232  }
233 
234  /*
235  * Collect names of arguments, too, if any
236  */
237  if (nargs > 0)
238  {
239  Datum proargnames;
240  Datum proargmodes;
241  int n_arg_names;
242  bool isNull;
243 
244  proargnames = SysCacheGetAttr(PROCNAMEARGSNSP, procedureTuple,
246  &isNull);
247  if (isNull)
248  proargnames = PointerGetDatum(NULL); /* just to be sure */
249 
250  proargmodes = SysCacheGetAttr(PROCNAMEARGSNSP, procedureTuple,
252  &isNull);
253  if (isNull)
254  proargmodes = PointerGetDatum(NULL); /* just to be sure */
255 
256  n_arg_names = get_func_input_arg_names(proargnames, proargmodes,
257  &pinfo->argnames);
258 
259  /* Paranoia: ignore the result if too few array entries */
260  if (n_arg_names < nargs)
261  pinfo->argnames = NULL;
262  }
263  else
264  pinfo->argnames = NULL;
265 
266  return pinfo;
267 }
268 
269 /*
270  * Parser setup hook for parsing a SQL function body.
271  */
272 void
274 {
275  pstate->p_pre_columnref_hook = NULL;
278  /* no need to use p_coerce_param_hook */
279  pstate->p_ref_hook_state = (void *) pinfo;
280 }
281 
282 /*
283  * sql_fn_post_column_ref parser callback for ColumnRefs
284  */
285 static Node *
287 {
289  int nnames;
290  Node *field1;
291  Node *subfield = NULL;
292  const char *name1;
293  const char *name2 = NULL;
294  Node *param;
295 
296  /*
297  * Never override a table-column reference. This corresponds to
298  * considering the parameter names to appear in a scope outside the
299  * individual SQL commands, which is what we want.
300  */
301  if (var != NULL)
302  return NULL;
303 
304  /*----------
305  * The allowed syntaxes are:
306  *
307  * A A = parameter name
308  * A.B A = function name, B = parameter name
309  * OR: A = record-typed parameter name, B = field name
310  * (the first possibility takes precedence)
311  * A.B.C A = function name, B = record-typed parameter name,
312  * C = field name
313  * A.* Whole-row reference to composite parameter A.
314  * A.B.* Same, with A = function name, B = parameter name
315  *
316  * Here, it's sufficient to ignore the "*" in the last two cases --- the
317  * main parser will take care of expanding the whole-row reference.
318  *----------
319  */
320  nnames = list_length(cref->fields);
321 
322  if (nnames > 3)
323  return NULL;
324 
325  if (IsA(llast(cref->fields), A_Star))
326  nnames--;
327 
328  field1 = (Node *) linitial(cref->fields);
329  Assert(IsA(field1, String));
330  name1 = strVal(field1);
331  if (nnames > 1)
332  {
333  subfield = (Node *) lsecond(cref->fields);
334  Assert(IsA(subfield, String));
335  name2 = strVal(subfield);
336  }
337 
338  if (nnames == 3)
339  {
340  /*
341  * Three-part name: if the first part doesn't match the function name,
342  * we can fail immediately. Otherwise, look up the second part, and
343  * take the third part to be a field reference.
344  */
345  if (strcmp(name1, pinfo->fname) != 0)
346  return NULL;
347 
348  param = sql_fn_resolve_param_name(pinfo, name2, cref->location);
349 
350  subfield = (Node *) lthird(cref->fields);
351  Assert(IsA(subfield, String));
352  }
353  else if (nnames == 2 && strcmp(name1, pinfo->fname) == 0)
354  {
355  /*
356  * Two-part name with first part matching function name: first see if
357  * second part matches any parameter name.
358  */
359  param = sql_fn_resolve_param_name(pinfo, name2, cref->location);
360 
361  if (param)
362  {
363  /* Yes, so this is a parameter reference, no subfield */
364  subfield = NULL;
365  }
366  else
367  {
368  /* No, so try to match as parameter name and subfield */
369  param = sql_fn_resolve_param_name(pinfo, name1, cref->location);
370  }
371  }
372  else
373  {
374  /* Single name, or parameter name followed by subfield */
375  param = sql_fn_resolve_param_name(pinfo, name1, cref->location);
376  }
377 
378  if (!param)
379  return NULL; /* No match */
380 
381  if (subfield)
382  {
383  /*
384  * Must be a reference to a field of a composite parameter; otherwise
385  * ParseFuncOrColumn will return NULL, and we'll fail back at the
386  * caller.
387  */
388  param = ParseFuncOrColumn(pstate,
389  list_make1(subfield),
390  list_make1(param),
391  NULL,
392  cref->location);
393  }
394 
395  return param;
396 }
397 
398 /*
399  * sql_fn_param_ref parser callback for ParamRefs ($n symbols)
400  */
401 static Node *
403 {
405  int paramno = pref->number;
406 
407  /* Check parameter number is valid */
408  if (paramno <= 0 || paramno > pinfo->nargs)
409  return NULL; /* unknown parameter number */
410 
411  return sql_fn_make_param(pinfo, paramno, pref->location);
412 }
413 
414 /*
415  * sql_fn_make_param construct a Param node for the given paramno
416  */
417 static Node *
419  int paramno, int location)
420 {
421  Param *param;
422 
423  param = makeNode(Param);
424  param->paramkind = PARAM_EXTERN;
425  param->paramid = paramno;
426  param->paramtype = pinfo->argtypes[paramno - 1];
427  param->paramtypmod = -1;
428  param->paramcollid = get_typcollation(param->paramtype);
429  param->location = location;
430 
431  /*
432  * If we have a function input collation, allow it to override the
433  * type-derived collation for parameter symbols. (XXX perhaps this should
434  * not happen if the type collation is not default?)
435  */
436  if (OidIsValid(pinfo->collation) && OidIsValid(param->paramcollid))
437  param->paramcollid = pinfo->collation;
438 
439  return (Node *) param;
440 }
441 
442 /*
443  * Search for a function parameter of the given name; if there is one,
444  * construct and return a Param node for it. If not, return NULL.
445  * Helper function for sql_fn_post_column_ref.
446  */
447 static Node *
449  const char *paramname, int location)
450 {
451  int i;
452 
453  if (pinfo->argnames == NULL)
454  return NULL;
455 
456  for (i = 0; i < pinfo->nargs; i++)
457  {
458  if (pinfo->argnames[i] && strcmp(pinfo->argnames[i], paramname) == 0)
459  return sql_fn_make_param(pinfo, i + 1, location);
460  }
461 
462  return NULL;
463 }
464 
465 /*
466  * Set up the per-query execution_state records for a SQL function.
467  *
468  * The input is a List of Lists of parsed and rewritten, but not planned,
469  * querytrees. The sublist structure denotes the original query boundaries.
470  */
471 static List *
472 init_execution_state(List *queryTree_list,
473  SQLFunctionCachePtr fcache,
474  bool lazyEvalOK)
475 {
476  List *eslist = NIL;
477  execution_state *lasttages = NULL;
478  ListCell *lc1;
479 
480  foreach(lc1, queryTree_list)
481  {
482  List *qtlist = castNode(List, lfirst(lc1));
483  execution_state *firstes = NULL;
484  execution_state *preves = NULL;
485  ListCell *lc2;
486 
487  foreach(lc2, qtlist)
488  {
489  Query *queryTree = castNode(Query, lfirst(lc2));
490  PlannedStmt *stmt;
491  execution_state *newes;
492 
493  /* Plan the query if needed */
494  if (queryTree->commandType == CMD_UTILITY)
495  {
496  /* Utility commands require no planning. */
497  stmt = makeNode(PlannedStmt);
498  stmt->commandType = CMD_UTILITY;
499  stmt->canSetTag = queryTree->canSetTag;
500  stmt->utilityStmt = queryTree->utilityStmt;
501  stmt->stmt_location = queryTree->stmt_location;
502  stmt->stmt_len = queryTree->stmt_len;
503  }
504  else
505  stmt = pg_plan_query(queryTree,
507  NULL);
508 
509  /*
510  * Precheck all commands for validity in a function. This should
511  * generally match the restrictions spi.c applies.
512  */
513  if (stmt->commandType == CMD_UTILITY)
514  {
515  if (IsA(stmt->utilityStmt, CopyStmt) &&
516  ((CopyStmt *) stmt->utilityStmt)->filename == NULL)
517  ereport(ERROR,
518  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
519  errmsg("cannot COPY to/from client in a SQL function")));
520 
521  if (IsA(stmt->utilityStmt, TransactionStmt))
522  ereport(ERROR,
523  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
524  /* translator: %s is a SQL statement name */
525  errmsg("%s is not allowed in a SQL function",
526  CreateCommandTag(stmt->utilityStmt))));
527  }
528 
529  if (fcache->readonly_func && !CommandIsReadOnly(stmt))
530  ereport(ERROR,
531  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
532  /* translator: %s is a SQL statement name */
533  errmsg("%s is not allowed in a non-volatile function",
534  CreateCommandTag((Node *) stmt))));
535 
536  if (IsInParallelMode() && !CommandIsReadOnly(stmt))
538 
539  /* OK, build the execution_state for this query */
540  newes = (execution_state *) palloc(sizeof(execution_state));
541  if (preves)
542  preves->next = newes;
543  else
544  firstes = newes;
545 
546  newes->next = NULL;
547  newes->status = F_EXEC_START;
548  newes->setsResult = false; /* might change below */
549  newes->lazyEval = false; /* might change below */
550  newes->stmt = stmt;
551  newes->qd = NULL;
552 
553  if (queryTree->canSetTag)
554  lasttages = newes;
555 
556  preves = newes;
557  }
558 
559  eslist = lappend(eslist, firstes);
560  }
561 
562  /*
563  * Mark the last canSetTag query as delivering the function result; then,
564  * if it is a plain SELECT, mark it for lazy evaluation. If it's not a
565  * SELECT we must always run it to completion.
566  *
567  * Note: at some point we might add additional criteria for whether to use
568  * lazy eval. However, we should prefer to use it whenever the function
569  * doesn't return set, since fetching more than one row is useless in that
570  * case.
571  *
572  * Note: don't set setsResult if the function returns VOID, as evidenced
573  * by not having made a junkfilter. This ensures we'll throw away any
574  * output from a utility statement that check_sql_fn_retval deemed to not
575  * have output.
576  */
577  if (lasttages && fcache->junkFilter)
578  {
579  lasttages->setsResult = true;
580  if (lazyEvalOK &&
581  lasttages->stmt->commandType == CMD_SELECT &&
582  !lasttages->stmt->hasModifyingCTE)
583  fcache->lazyEval = lasttages->lazyEval = true;
584  }
585 
586  return eslist;
587 }
588 
589 /*
590  * Initialize the SQLFunctionCache for a SQL function
591  */
592 static void
593 init_sql_fcache(FmgrInfo *finfo, Oid collation, bool lazyEvalOK)
594 {
595  Oid foid = finfo->fn_oid;
596  MemoryContext fcontext;
597  MemoryContext oldcontext;
598  Oid rettype;
599  HeapTuple procedureTuple;
600  Form_pg_proc procedureStruct;
601  SQLFunctionCachePtr fcache;
602  List *raw_parsetree_list;
603  List *queryTree_list;
604  List *flat_query_list;
605  ListCell *lc;
606  Datum tmp;
607  bool isNull;
608 
609  /*
610  * Create memory context that holds all the SQLFunctionCache data. It
611  * must be a child of whatever context holds the FmgrInfo.
612  */
613  fcontext = AllocSetContextCreate(finfo->fn_mcxt,
614  "SQL function data",
616 
617  oldcontext = MemoryContextSwitchTo(fcontext);
618 
619  /*
620  * Create the struct proper, link it to fcontext and fn_extra. Once this
621  * is done, we'll be able to recover the memory after failure, even if the
622  * FmgrInfo is long-lived.
623  */
624  fcache = (SQLFunctionCachePtr) palloc0(sizeof(SQLFunctionCache));
625  fcache->fcontext = fcontext;
626  finfo->fn_extra = (void *) fcache;
627 
628  /*
629  * get the procedure tuple corresponding to the given function Oid
630  */
631  procedureTuple = SearchSysCache1(PROCOID, ObjectIdGetDatum(foid));
632  if (!HeapTupleIsValid(procedureTuple))
633  elog(ERROR, "cache lookup failed for function %u", foid);
634  procedureStruct = (Form_pg_proc) GETSTRUCT(procedureTuple);
635 
636  /*
637  * copy function name immediately for use by error reporting callback
638  */
639  fcache->fname = pstrdup(NameStr(procedureStruct->proname));
640 
641  /*
642  * get the result type from the procedure tuple, and check for polymorphic
643  * result type; if so, find out the actual result type.
644  */
645  rettype = procedureStruct->prorettype;
646 
647  if (IsPolymorphicType(rettype))
648  {
649  rettype = get_fn_expr_rettype(finfo);
650  if (rettype == InvalidOid) /* this probably should not happen */
651  ereport(ERROR,
652  (errcode(ERRCODE_DATATYPE_MISMATCH),
653  errmsg("could not determine actual result type for function declared to return type %s",
654  format_type_be(procedureStruct->prorettype))));
655  }
656 
657  fcache->rettype = rettype;
658 
659  /* Fetch the typlen and byval info for the result type */
660  get_typlenbyval(rettype, &fcache->typlen, &fcache->typbyval);
661 
662  /* Remember whether we're returning setof something */
663  fcache->returnsSet = procedureStruct->proretset;
664 
665  /* Remember if function is STABLE/IMMUTABLE */
666  fcache->readonly_func =
667  (procedureStruct->provolatile != PROVOLATILE_VOLATILE);
668 
669  /*
670  * We need the actual argument types to pass to the parser. Also make
671  * sure that parameter symbols are considered to have the function's
672  * resolved input collation.
673  */
674  fcache->pinfo = prepare_sql_fn_parse_info(procedureTuple,
675  finfo->fn_expr,
676  collation);
677 
678  /*
679  * And of course we need the function body text.
680  */
681  tmp = SysCacheGetAttr(PROCOID,
682  procedureTuple,
684  &isNull);
685  if (isNull)
686  elog(ERROR, "null prosrc for function %u", foid);
687  fcache->src = TextDatumGetCString(tmp);
688 
689  /*
690  * Parse and rewrite the queries in the function text. Use sublists to
691  * keep track of the original query boundaries. But we also build a
692  * "flat" list of the rewritten queries to pass to check_sql_fn_retval.
693  * This is because the last canSetTag query determines the result type
694  * independently of query boundaries --- and it might not be in the last
695  * sublist, for example if the last query rewrites to DO INSTEAD NOTHING.
696  * (It might not be unreasonable to throw an error in such a case, but
697  * this is the historical behavior and it doesn't seem worth changing.)
698  *
699  * Note: since parsing and planning is done in fcontext, we will generate
700  * a lot of cruft that lives as long as the fcache does. This is annoying
701  * but we'll not worry about it until the module is rewritten to use
702  * plancache.c.
703  */
704  raw_parsetree_list = pg_parse_query(fcache->src);
705 
706  queryTree_list = NIL;
707  flat_query_list = NIL;
708  foreach(lc, raw_parsetree_list)
709  {
710  RawStmt *parsetree = castNode(RawStmt, lfirst(lc));
711  List *queryTree_sublist;
712 
713  queryTree_sublist = pg_analyze_and_rewrite_params(parsetree,
714  fcache->src,
716  fcache->pinfo);
717  queryTree_list = lappend(queryTree_list, queryTree_sublist);
718  flat_query_list = list_concat(flat_query_list,
719  list_copy(queryTree_sublist));
720  }
721 
722  /*
723  * Check that the function returns the type it claims to. Although in
724  * simple cases this was already done when the function was defined, we
725  * have to recheck because database objects used in the function's queries
726  * might have changed type. We'd have to do it anyway if the function had
727  * any polymorphic arguments.
728  *
729  * Note: we set fcache->returnsTuple according to whether we are returning
730  * the whole tuple result or just a single column. In the latter case we
731  * clear returnsTuple because we need not act different from the scalar
732  * result case, even if it's a rowtype column. (However, we have to force
733  * lazy eval mode in that case; otherwise we'd need extra code to expand
734  * the rowtype column into multiple columns, since we have no way to
735  * notify the caller that it should do that.)
736  *
737  * check_sql_fn_retval will also construct a JunkFilter we can use to
738  * coerce the returned rowtype to the desired form (unless the result type
739  * is VOID, in which case there's nothing to coerce to).
740  */
741  fcache->returnsTuple = check_sql_fn_retval(foid,
742  rettype,
743  flat_query_list,
744  NULL,
745  &fcache->junkFilter);
746 
747  if (fcache->returnsTuple)
748  {
749  /* Make sure output rowtype is properly blessed */
751  }
752  else if (fcache->returnsSet && type_is_rowtype(fcache->rettype))
753  {
754  /*
755  * Returning rowtype as if it were scalar --- materialize won't work.
756  * Right now it's sufficient to override any caller preference for
757  * materialize mode, but to add more smarts in init_execution_state
758  * about this, we'd probably need a three-way flag instead of bool.
759  */
760  lazyEvalOK = true;
761  }
762 
763  /* Finally, plan the queries */
764  fcache->func_state = init_execution_state(queryTree_list,
765  fcache,
766  lazyEvalOK);
767 
768  /* Mark fcache with time of creation to show it's valid */
769  fcache->lxid = MyProc->lxid;
771 
772  ReleaseSysCache(procedureTuple);
773 
774  MemoryContextSwitchTo(oldcontext);
775 }
776 
777 /* Start up execution of one execution_state node */
778 static void
780 {
781  DestReceiver *dest;
782 
783  Assert(es->qd == NULL);
784 
785  /* Caller should have ensured a suitable snapshot is active */
787 
788  /*
789  * If this query produces the function result, send its output to the
790  * tuplestore; else discard any output.
791  */
792  if (es->setsResult)
793  {
794  DR_sqlfunction *myState;
795 
797  /* pass down the needed info to the dest receiver routines */
798  myState = (DR_sqlfunction *) dest;
799  Assert(myState->pub.mydest == DestSQLFunction);
800  myState->tstore = fcache->tstore;
801  myState->cxt = CurrentMemoryContext;
802  myState->filter = fcache->junkFilter;
803  }
804  else
805  dest = None_Receiver;
806 
807  es->qd = CreateQueryDesc(es->stmt,
808  fcache->src,
811  dest,
812  fcache->paramLI, 0);
813 
814  /* Utility commands don't need Executor. */
815  if (es->qd->operation != CMD_UTILITY)
816  {
817  /*
818  * In lazyEval mode, do not let the executor set up an AfterTrigger
819  * context. This is necessary not just an optimization, because we
820  * mustn't exit from the function execution with a stacked
821  * AfterTrigger level still active. We are careful not to select
822  * lazyEval mode for any statement that could possibly queue triggers.
823  */
824  int eflags;
825 
826  if (es->lazyEval)
827  eflags = EXEC_FLAG_SKIP_TRIGGERS;
828  else
829  eflags = 0; /* default run-to-completion flags */
830  ExecutorStart(es->qd, eflags);
831  }
832 
833  es->status = F_EXEC_RUN;
834 }
835 
836 /* Run one execution_state; either to completion or to first result row */
837 /* Returns true if we ran to completion */
838 static bool
840 {
841  bool result;
842 
843  if (es->qd->operation == CMD_UTILITY)
844  {
846  fcache->src,
848  es->qd->params,
849  es->qd->dest,
850  NULL);
851  result = true; /* never stops early */
852  }
853  else
854  {
855  /* Run regular commands to completion unless lazyEval */
856  uint64 count = (es->lazyEval) ? 1 : 0;
857 
858  ExecutorRun(es->qd, ForwardScanDirection, count);
859 
860  /*
861  * If we requested run to completion OR there was no tuple returned,
862  * command must be complete.
863  */
864  result = (count == 0 || es->qd->estate->es_processed == 0);
865  }
866 
867  return result;
868 }
869 
870 /* Shut down execution of one execution_state node */
871 static void
873 {
874  /* mark status done to ensure we don't do ExecutorEnd twice */
875  es->status = F_EXEC_DONE;
876 
877  /* Utility commands don't need Executor. */
878  if (es->qd->operation != CMD_UTILITY)
879  {
880  ExecutorFinish(es->qd);
881  ExecutorEnd(es->qd);
882  }
883 
884  (*es->qd->dest->rDestroy) (es->qd->dest);
885 
886  FreeQueryDesc(es->qd);
887  es->qd = NULL;
888 }
889 
890 /* Build ParamListInfo array representing current arguments */
891 static void
893  FunctionCallInfo fcinfo)
894 {
895  int nargs = fcinfo->nargs;
896 
897  if (nargs > 0)
898  {
899  ParamListInfo paramLI;
900  int i;
901 
902  if (fcache->paramLI == NULL)
903  {
904  paramLI = (ParamListInfo)
906  nargs * sizeof(ParamExternData));
907  /* we have static list of params, so no hooks needed */
908  paramLI->paramFetch = NULL;
909  paramLI->paramFetchArg = NULL;
910  paramLI->parserSetup = NULL;
911  paramLI->parserSetupArg = NULL;
912  paramLI->numParams = nargs;
913  paramLI->paramMask = NULL;
914  fcache->paramLI = paramLI;
915  }
916  else
917  {
918  paramLI = fcache->paramLI;
919  Assert(paramLI->numParams == nargs);
920  }
921 
922  for (i = 0; i < nargs; i++)
923  {
924  ParamExternData *prm = &paramLI->params[i];
925 
926  prm->value = fcinfo->arg[i];
927  prm->isnull = fcinfo->argnull[i];
928  prm->pflags = 0;
929  prm->ptype = fcache->pinfo->argtypes[i];
930  }
931  }
932  else
933  fcache->paramLI = NULL;
934 }
935 
936 /*
937  * Extract the SQL function's value from a single result row. This is used
938  * both for scalar (non-set) functions and for each row of a lazy-eval set
939  * result.
940  */
941 static Datum
943  FunctionCallInfo fcinfo,
944  SQLFunctionCachePtr fcache,
945  MemoryContext resultcontext)
946 {
947  Datum value;
948  MemoryContext oldcontext;
949 
950  /*
951  * Set up to return the function value. For pass-by-reference datatypes,
952  * be sure to allocate the result in resultcontext, not the current memory
953  * context (which has query lifespan). We can't leave the data in the
954  * TupleTableSlot because we intend to clear the slot before returning.
955  */
956  oldcontext = MemoryContextSwitchTo(resultcontext);
957 
958  if (fcache->returnsTuple)
959  {
960  /* We must return the whole tuple as a Datum. */
961  fcinfo->isnull = false;
962  value = ExecFetchSlotTupleDatum(slot);
963  }
964  else
965  {
966  /*
967  * Returning a scalar, which we have to extract from the first column
968  * of the SELECT result, and then copy into result context if needed.
969  */
970  value = slot_getattr(slot, 1, &(fcinfo->isnull));
971 
972  if (!fcinfo->isnull)
973  value = datumCopy(value, fcache->typbyval, fcache->typlen);
974  }
975 
976  MemoryContextSwitchTo(oldcontext);
977 
978  return value;
979 }
980 
981 /*
982  * fmgr_sql: function call manager for SQL functions
983  */
984 Datum
986 {
987  SQLFunctionCachePtr fcache;
988  ErrorContextCallback sqlerrcontext;
989  MemoryContext oldcontext;
990  bool randomAccess;
991  bool lazyEvalOK;
992  bool is_first;
993  bool pushed_snapshot;
994  execution_state *es;
995  TupleTableSlot *slot;
996  Datum result;
997  List *eslist;
998  ListCell *eslc;
999 
1000  /*
1001  * Setup error traceback support for ereport()
1002  */
1003  sqlerrcontext.callback = sql_exec_error_callback;
1004  sqlerrcontext.arg = fcinfo->flinfo;
1005  sqlerrcontext.previous = error_context_stack;
1006  error_context_stack = &sqlerrcontext;
1007 
1008  /* Check call context */
1009  if (fcinfo->flinfo->fn_retset)
1010  {
1011  ReturnSetInfo *rsi = (ReturnSetInfo *) fcinfo->resultinfo;
1012 
1013  /*
1014  * For simplicity, we require callers to support both set eval modes.
1015  * There are cases where we must use one or must use the other, and
1016  * it's not really worthwhile to postpone the check till we know. But
1017  * note we do not require caller to provide an expectedDesc.
1018  */
1019  if (!rsi || !IsA(rsi, ReturnSetInfo) ||
1020  (rsi->allowedModes & SFRM_ValuePerCall) == 0 ||
1021  (rsi->allowedModes & SFRM_Materialize) == 0)
1022  ereport(ERROR,
1023  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1024  errmsg("set-valued function called in context that cannot accept a set")));
1025  randomAccess = rsi->allowedModes & SFRM_Materialize_Random;
1026  lazyEvalOK = !(rsi->allowedModes & SFRM_Materialize_Preferred);
1027  }
1028  else
1029  {
1030  randomAccess = false;
1031  lazyEvalOK = true;
1032  }
1033 
1034  /*
1035  * Initialize fcache (build plans) if first time through; or re-initialize
1036  * if the cache is stale.
1037  */
1038  fcache = (SQLFunctionCachePtr) fcinfo->flinfo->fn_extra;
1039 
1040  if (fcache != NULL)
1041  {
1042  if (fcache->lxid != MyProc->lxid ||
1043  !SubTransactionIsActive(fcache->subxid))
1044  {
1045  /* It's stale; unlink and delete */
1046  fcinfo->flinfo->fn_extra = NULL;
1047  MemoryContextDelete(fcache->fcontext);
1048  fcache = NULL;
1049  }
1050  }
1051 
1052  if (fcache == NULL)
1053  {
1054  init_sql_fcache(fcinfo->flinfo, PG_GET_COLLATION(), lazyEvalOK);
1055  fcache = (SQLFunctionCachePtr) fcinfo->flinfo->fn_extra;
1056  }
1057 
1058  /*
1059  * Switch to context in which the fcache lives. This ensures that our
1060  * tuplestore etc will have sufficient lifetime. The sub-executor is
1061  * responsible for deleting per-tuple information. (XXX in the case of a
1062  * long-lived FmgrInfo, this policy represents more memory leakage, but
1063  * it's not entirely clear where to keep stuff instead.)
1064  */
1065  oldcontext = MemoryContextSwitchTo(fcache->fcontext);
1066 
1067  /*
1068  * Find first unfinished query in function, and note whether it's the
1069  * first query.
1070  */
1071  eslist = fcache->func_state;
1072  es = NULL;
1073  is_first = true;
1074  foreach(eslc, eslist)
1075  {
1076  es = (execution_state *) lfirst(eslc);
1077 
1078  while (es && es->status == F_EXEC_DONE)
1079  {
1080  is_first = false;
1081  es = es->next;
1082  }
1083 
1084  if (es)
1085  break;
1086  }
1087 
1088  /*
1089  * Convert params to appropriate format if starting a fresh execution. (If
1090  * continuing execution, we can re-use prior params.)
1091  */
1092  if (is_first && es && es->status == F_EXEC_START)
1093  postquel_sub_params(fcache, fcinfo);
1094 
1095  /*
1096  * Build tuplestore to hold results, if we don't have one already. Note
1097  * it's in the query-lifespan context.
1098  */
1099  if (!fcache->tstore)
1100  fcache->tstore = tuplestore_begin_heap(randomAccess, false, work_mem);
1101 
1102  /*
1103  * Execute each command in the function one after another until we either
1104  * run out of commands or get a result row from a lazily-evaluated SELECT.
1105  *
1106  * Notes about snapshot management:
1107  *
1108  * In a read-only function, we just use the surrounding query's snapshot.
1109  *
1110  * In a non-read-only function, we rely on the fact that we'll never
1111  * suspend execution between queries of the function: the only reason to
1112  * suspend execution before completion is if we are returning a row from a
1113  * lazily-evaluated SELECT. So, when first entering this loop, we'll
1114  * either start a new query (and push a fresh snapshot) or re-establish
1115  * the active snapshot from the existing query descriptor. If we need to
1116  * start a new query in a subsequent execution of the loop, either we need
1117  * a fresh snapshot (and pushed_snapshot is false) or the existing
1118  * snapshot is on the active stack and we can just bump its command ID.
1119  */
1120  pushed_snapshot = false;
1121  while (es)
1122  {
1123  bool completed;
1124 
1125  if (es->status == F_EXEC_START)
1126  {
1127  /*
1128  * If not read-only, be sure to advance the command counter for
1129  * each command, so that all work to date in this transaction is
1130  * visible. Take a new snapshot if we don't have one yet,
1131  * otherwise just bump the command ID in the existing snapshot.
1132  */
1133  if (!fcache->readonly_func)
1134  {
1136  if (!pushed_snapshot)
1137  {
1139  pushed_snapshot = true;
1140  }
1141  else
1143  }
1144 
1145  postquel_start(es, fcache);
1146  }
1147  else if (!fcache->readonly_func && !pushed_snapshot)
1148  {
1149  /* Re-establish active snapshot when re-entering function */
1151  pushed_snapshot = true;
1152  }
1153 
1154  completed = postquel_getnext(es, fcache);
1155 
1156  /*
1157  * If we ran the command to completion, we can shut it down now. Any
1158  * row(s) we need to return are safely stashed in the tuplestore, and
1159  * we want to be sure that, for example, AFTER triggers get fired
1160  * before we return anything. Also, if the function doesn't return
1161  * set, we can shut it down anyway because it must be a SELECT and we
1162  * don't care about fetching any more result rows.
1163  */
1164  if (completed || !fcache->returnsSet)
1165  postquel_end(es);
1166 
1167  /*
1168  * Break from loop if we didn't shut down (implying we got a
1169  * lazily-evaluated row). Otherwise we'll press on till the whole
1170  * function is done, relying on the tuplestore to keep hold of the
1171  * data to eventually be returned. This is necessary since an
1172  * INSERT/UPDATE/DELETE RETURNING that sets the result might be
1173  * followed by additional rule-inserted commands, and we want to
1174  * finish doing all those commands before we return anything.
1175  */
1176  if (es->status != F_EXEC_DONE)
1177  break;
1178 
1179  /*
1180  * Advance to next execution_state, which might be in the next list.
1181  */
1182  es = es->next;
1183  while (!es)
1184  {
1185  eslc = lnext(eslc);
1186  if (!eslc)
1187  break; /* end of function */
1188 
1189  es = (execution_state *) lfirst(eslc);
1190 
1191  /*
1192  * Flush the current snapshot so that we will take a new one for
1193  * the new query list. This ensures that new snaps are taken at
1194  * original-query boundaries, matching the behavior of interactive
1195  * execution.
1196  */
1197  if (pushed_snapshot)
1198  {
1200  pushed_snapshot = false;
1201  }
1202  }
1203  }
1204 
1205  /*
1206  * The tuplestore now contains whatever row(s) we are supposed to return.
1207  */
1208  if (fcache->returnsSet)
1209  {
1210  ReturnSetInfo *rsi = (ReturnSetInfo *) fcinfo->resultinfo;
1211 
1212  if (es)
1213  {
1214  /*
1215  * If we stopped short of being done, we must have a lazy-eval
1216  * row.
1217  */
1218  Assert(es->lazyEval);
1219  /* Re-use the junkfilter's output slot to fetch back the tuple */
1220  Assert(fcache->junkFilter);
1221  slot = fcache->junkFilter->jf_resultSlot;
1222  if (!tuplestore_gettupleslot(fcache->tstore, true, false, slot))
1223  elog(ERROR, "failed to fetch lazy-eval tuple");
1224  /* Extract the result as a datum, and copy out from the slot */
1225  result = postquel_get_single_result(slot, fcinfo,
1226  fcache, oldcontext);
1227  /* Clear the tuplestore, but keep it for next time */
1228  /* NB: this might delete the slot's content, but we don't care */
1229  tuplestore_clear(fcache->tstore);
1230 
1231  /*
1232  * Let caller know we're not finished.
1233  */
1234  rsi->isDone = ExprMultipleResult;
1235 
1236  /*
1237  * Ensure we will get shut down cleanly if the exprcontext is not
1238  * run to completion.
1239  */
1240  if (!fcache->shutdown_reg)
1241  {
1244  PointerGetDatum(fcache));
1245  fcache->shutdown_reg = true;
1246  }
1247  }
1248  else if (fcache->lazyEval)
1249  {
1250  /*
1251  * We are done with a lazy evaluation. Clean up.
1252  */
1253  tuplestore_clear(fcache->tstore);
1254 
1255  /*
1256  * Let caller know we're finished.
1257  */
1258  rsi->isDone = ExprEndResult;
1259 
1260  fcinfo->isnull = true;
1261  result = (Datum) 0;
1262 
1263  /* Deregister shutdown callback, if we made one */
1264  if (fcache->shutdown_reg)
1265  {
1268  PointerGetDatum(fcache));
1269  fcache->shutdown_reg = false;
1270  }
1271  }
1272  else
1273  {
1274  /*
1275  * We are done with a non-lazy evaluation. Return whatever is in
1276  * the tuplestore. (It is now caller's responsibility to free the
1277  * tuplestore when done.)
1278  */
1280  rsi->setResult = fcache->tstore;
1281  fcache->tstore = NULL;
1282  /* must copy desc because execQual will free it */
1283  if (fcache->junkFilter)
1285 
1286  fcinfo->isnull = true;
1287  result = (Datum) 0;
1288 
1289  /* Deregister shutdown callback, if we made one */
1290  if (fcache->shutdown_reg)
1291  {
1294  PointerGetDatum(fcache));
1295  fcache->shutdown_reg = false;
1296  }
1297  }
1298  }
1299  else
1300  {
1301  /*
1302  * Non-set function. If we got a row, return it; else return NULL.
1303  */
1304  if (fcache->junkFilter)
1305  {
1306  /* Re-use the junkfilter's output slot to fetch back the tuple */
1307  slot = fcache->junkFilter->jf_resultSlot;
1308  if (tuplestore_gettupleslot(fcache->tstore, true, false, slot))
1309  result = postquel_get_single_result(slot, fcinfo,
1310  fcache, oldcontext);
1311  else
1312  {
1313  fcinfo->isnull = true;
1314  result = (Datum) 0;
1315  }
1316  }
1317  else
1318  {
1319  /* Should only get here for VOID functions */
1320  Assert(fcache->rettype == VOIDOID);
1321  fcinfo->isnull = true;
1322  result = (Datum) 0;
1323  }
1324 
1325  /* Clear the tuplestore, but keep it for next time */
1326  tuplestore_clear(fcache->tstore);
1327  }
1328 
1329  /* Pop snapshot if we have pushed one */
1330  if (pushed_snapshot)
1332 
1333  /*
1334  * If we've gone through every command in the function, we are done. Reset
1335  * the execution states to start over again on next call.
1336  */
1337  if (es == NULL)
1338  {
1339  foreach(eslc, fcache->func_state)
1340  {
1341  es = (execution_state *) lfirst(eslc);
1342  while (es)
1343  {
1344  es->status = F_EXEC_START;
1345  es = es->next;
1346  }
1347  }
1348  }
1349 
1350  error_context_stack = sqlerrcontext.previous;
1351 
1352  MemoryContextSwitchTo(oldcontext);
1353 
1354  return result;
1355 }
1356 
1357 
1358 /*
1359  * error context callback to let us supply a call-stack traceback
1360  */
1361 static void
1363 {
1364  FmgrInfo *flinfo = (FmgrInfo *) arg;
1366  int syntaxerrposition;
1367 
1368  /*
1369  * We can do nothing useful if init_sql_fcache() didn't get as far as
1370  * saving the function name
1371  */
1372  if (fcache == NULL || fcache->fname == NULL)
1373  return;
1374 
1375  /*
1376  * If there is a syntax error position, convert to internal syntax error
1377  */
1378  syntaxerrposition = geterrposition();
1379  if (syntaxerrposition > 0 && fcache->src != NULL)
1380  {
1381  errposition(0);
1382  internalerrposition(syntaxerrposition);
1383  internalerrquery(fcache->src);
1384  }
1385 
1386  /*
1387  * Try to determine where in the function we failed. If there is a query
1388  * with non-null QueryDesc, finger it. (We check this rather than looking
1389  * for F_EXEC_RUN state, so that errors during ExecutorStart or
1390  * ExecutorEnd are blamed on the appropriate query; see postquel_start and
1391  * postquel_end.)
1392  */
1393  if (fcache->func_state)
1394  {
1395  execution_state *es;
1396  int query_num;
1397  ListCell *lc;
1398 
1399  es = NULL;
1400  query_num = 1;
1401  foreach(lc, fcache->func_state)
1402  {
1403  es = (execution_state *) lfirst(lc);
1404  while (es)
1405  {
1406  if (es->qd)
1407  {
1408  errcontext("SQL function \"%s\" statement %d",
1409  fcache->fname, query_num);
1410  break;
1411  }
1412  es = es->next;
1413  }
1414  if (es)
1415  break;
1416  query_num++;
1417  }
1418  if (es == NULL)
1419  {
1420  /*
1421  * couldn't identify a running query; might be function entry,
1422  * function exit, or between queries.
1423  */
1424  errcontext("SQL function \"%s\"", fcache->fname);
1425  }
1426  }
1427  else
1428  {
1429  /*
1430  * Assume we failed during init_sql_fcache(). (It's possible that the
1431  * function actually has an empty body, but in that case we may as
1432  * well report all errors as being "during startup".)
1433  */
1434  errcontext("SQL function \"%s\" during startup", fcache->fname);
1435  }
1436 }
1437 
1438 
1439 /*
1440  * callback function in case a function-returning-set needs to be shut down
1441  * before it has been run to completion
1442  */
1443 static void
1445 {
1447  execution_state *es;
1448  ListCell *lc;
1449 
1450  foreach(lc, fcache->func_state)
1451  {
1452  es = (execution_state *) lfirst(lc);
1453  while (es)
1454  {
1455  /* Shut down anything still running */
1456  if (es->status == F_EXEC_RUN)
1457  {
1458  /* Re-establish active snapshot for any called functions */
1459  if (!fcache->readonly_func)
1461 
1462  postquel_end(es);
1463 
1464  if (!fcache->readonly_func)
1466  }
1467 
1468  /* Reset states to START in case we're called again */
1469  es->status = F_EXEC_START;
1470  es = es->next;
1471  }
1472  }
1473 
1474  /* Release tuplestore if we have one */
1475  if (fcache->tstore)
1476  tuplestore_end(fcache->tstore);
1477  fcache->tstore = NULL;
1478 
1479  /* execUtils will deregister the callback... */
1480  fcache->shutdown_reg = false;
1481 }
1482 
1483 
1484 /*
1485  * check_sql_fn_retval() -- check return value of a list of sql parse trees.
1486  *
1487  * The return value of a sql function is the value returned by the last
1488  * canSetTag query in the function. We do some ad-hoc type checking here
1489  * to be sure that the user is returning the type he claims. There are
1490  * also a couple of strange-looking features to assist callers in dealing
1491  * with allowed special cases, such as binary-compatible result types.
1492  *
1493  * For a polymorphic function the passed rettype must be the actual resolved
1494  * output type of the function; we should never see a polymorphic pseudotype
1495  * such as ANYELEMENT as rettype. (This means we can't check the type during
1496  * function definition of a polymorphic function.)
1497  *
1498  * This function returns true if the sql function returns the entire tuple
1499  * result of its final statement, or false if it returns just the first column
1500  * result of that statement. It throws an error if the final statement doesn't
1501  * return the right type at all.
1502  *
1503  * Note that because we allow "SELECT rowtype_expression", the result can be
1504  * false even when the declared function return type is a rowtype.
1505  *
1506  * If modifyTargetList isn't NULL, the function will modify the final
1507  * statement's targetlist in two cases:
1508  * (1) if the tlist returns values that are binary-coercible to the expected
1509  * type rather than being exactly the expected type. RelabelType nodes will
1510  * be inserted to make the result types match exactly.
1511  * (2) if there are dropped columns in the declared result rowtype. NULL
1512  * output columns will be inserted in the tlist to match them.
1513  * (Obviously the caller must pass a parsetree that is okay to modify when
1514  * using this flag.) Note that this flag does not affect whether the tlist is
1515  * considered to be a legal match to the result type, only how we react to
1516  * allowed not-exact-match cases. *modifyTargetList will be set true iff
1517  * we had to make any "dangerous" changes that could modify the semantics of
1518  * the statement. If it is set true, the caller should not use the modified
1519  * statement, but for simplicity we apply the changes anyway.
1520  *
1521  * If junkFilter isn't NULL, then *junkFilter is set to a JunkFilter defined
1522  * to convert the function's tuple result to the correct output tuple type.
1523  * Exception: if the function is defined to return VOID then *junkFilter is
1524  * set to NULL.
1525  */
1526 bool
1527 check_sql_fn_retval(Oid func_id, Oid rettype, List *queryTreeList,
1528  bool *modifyTargetList,
1529  JunkFilter **junkFilter)
1530 {
1531  Query *parse;
1532  List **tlist_ptr;
1533  List *tlist;
1534  int tlistlen;
1535  char fn_typtype;
1536  Oid restype;
1537  ListCell *lc;
1538 
1539  AssertArg(!IsPolymorphicType(rettype));
1540 
1541  if (modifyTargetList)
1542  *modifyTargetList = false; /* initialize for no change */
1543  if (junkFilter)
1544  *junkFilter = NULL; /* initialize in case of VOID result */
1545 
1546  /*
1547  * Find the last canSetTag query in the list. This isn't necessarily the
1548  * last parsetree, because rule rewriting can insert queries after what
1549  * the user wrote.
1550  */
1551  parse = NULL;
1552  foreach(lc, queryTreeList)
1553  {
1554  Query *q = castNode(Query, lfirst(lc));
1555 
1556  if (q->canSetTag)
1557  parse = q;
1558  }
1559 
1560  /*
1561  * If it's a plain SELECT, it returns whatever the targetlist says.
1562  * Otherwise, if it's INSERT/UPDATE/DELETE with RETURNING, it returns
1563  * that. Otherwise, the function return type must be VOID.
1564  *
1565  * Note: eventually replace this test with QueryReturnsTuples? We'd need
1566  * a more general method of determining the output type, though. Also, it
1567  * seems too dangerous to consider FETCH or EXECUTE as returning a
1568  * determinable rowtype, since they depend on relatively short-lived
1569  * entities.
1570  */
1571  if (parse &&
1572  parse->commandType == CMD_SELECT)
1573  {
1574  tlist_ptr = &parse->targetList;
1575  tlist = parse->targetList;
1576  }
1577  else if (parse &&
1578  (parse->commandType == CMD_INSERT ||
1579  parse->commandType == CMD_UPDATE ||
1580  parse->commandType == CMD_DELETE) &&
1581  parse->returningList)
1582  {
1583  tlist_ptr = &parse->returningList;
1584  tlist = parse->returningList;
1585  }
1586  else
1587  {
1588  /* Empty function body, or last statement is a utility command */
1589  if (rettype != VOIDOID)
1590  ereport(ERROR,
1591  (errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
1592  errmsg("return type mismatch in function declared to return %s",
1593  format_type_be(rettype)),
1594  errdetail("Function's final statement must be SELECT or INSERT/UPDATE/DELETE RETURNING.")));
1595  return false;
1596  }
1597 
1598  /*
1599  * OK, check that the targetlist returns something matching the declared
1600  * type. (We used to insist that the declared type not be VOID in this
1601  * case, but that makes it hard to write a void function that exits after
1602  * calling another void function. Instead, we insist that the tlist
1603  * return void ... so void is treated as if it were a scalar type below.)
1604  */
1605 
1606  /*
1607  * Count the non-junk entries in the result targetlist.
1608  */
1609  tlistlen = ExecCleanTargetListLength(tlist);
1610 
1611  fn_typtype = get_typtype(rettype);
1612 
1613  if (fn_typtype == TYPTYPE_BASE ||
1614  fn_typtype == TYPTYPE_DOMAIN ||
1615  fn_typtype == TYPTYPE_ENUM ||
1616  fn_typtype == TYPTYPE_RANGE ||
1617  rettype == VOIDOID)
1618  {
1619  /*
1620  * For scalar-type returns, the target list must have exactly one
1621  * non-junk entry, and its type must agree with what the user
1622  * declared; except we allow binary-compatible types too.
1623  */
1624  TargetEntry *tle;
1625 
1626  if (tlistlen != 1)
1627  ereport(ERROR,
1628  (errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
1629  errmsg("return type mismatch in function declared to return %s",
1630  format_type_be(rettype)),
1631  errdetail("Final statement must return exactly one column.")));
1632 
1633  /* We assume here that non-junk TLEs must come first in tlists */
1634  tle = (TargetEntry *) linitial(tlist);
1635  Assert(!tle->resjunk);
1636 
1637  restype = exprType((Node *) tle->expr);
1638  if (!IsBinaryCoercible(restype, rettype))
1639  ereport(ERROR,
1640  (errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
1641  errmsg("return type mismatch in function declared to return %s",
1642  format_type_be(rettype)),
1643  errdetail("Actual return type is %s.",
1644  format_type_be(restype))));
1645  if (modifyTargetList && restype != rettype)
1646  {
1647  tle->expr = (Expr *) makeRelabelType(tle->expr,
1648  rettype,
1649  -1,
1650  get_typcollation(rettype),
1652  /* Relabel is dangerous if TLE is a sort/group or setop column */
1653  if (tle->ressortgroupref != 0 || parse->setOperations)
1654  *modifyTargetList = true;
1655  }
1656 
1657  /* Set up junk filter if needed */
1658  if (junkFilter)
1659  *junkFilter = ExecInitJunkFilter(tlist, false, NULL);
1660  }
1661  else if (fn_typtype == TYPTYPE_COMPOSITE || rettype == RECORDOID)
1662  {
1663  /* Returns a rowtype */
1664  TupleDesc tupdesc;
1665  int tupnatts; /* physical number of columns in tuple */
1666  int tuplogcols; /* # of nondeleted columns in tuple */
1667  int colindex; /* physical column index */
1668  List *newtlist; /* new non-junk tlist entries */
1669  List *junkattrs; /* new junk tlist entries */
1670 
1671  /*
1672  * If the target list is of length 1, and the type of the varnode in
1673  * the target list matches the declared return type, this is okay.
1674  * This can happen, for example, where the body of the function is
1675  * 'SELECT func2()', where func2 has the same composite return type as
1676  * the function that's calling it.
1677  *
1678  * XXX Note that if rettype is RECORD, the IsBinaryCoercible check
1679  * will succeed for any composite restype. For the moment we rely on
1680  * runtime type checking to catch any discrepancy, but it'd be nice to
1681  * do better at parse time.
1682  */
1683  if (tlistlen == 1)
1684  {
1685  TargetEntry *tle = (TargetEntry *) linitial(tlist);
1686 
1687  Assert(!tle->resjunk);
1688  restype = exprType((Node *) tle->expr);
1689  if (IsBinaryCoercible(restype, rettype))
1690  {
1691  if (modifyTargetList && restype != rettype)
1692  {
1693  tle->expr = (Expr *) makeRelabelType(tle->expr,
1694  rettype,
1695  -1,
1696  get_typcollation(rettype),
1698  /* Relabel is dangerous if sort/group or setop column */
1699  if (tle->ressortgroupref != 0 || parse->setOperations)
1700  *modifyTargetList = true;
1701  }
1702  /* Set up junk filter if needed */
1703  if (junkFilter)
1704  *junkFilter = ExecInitJunkFilter(tlist, false, NULL);
1705  return false; /* NOT returning whole tuple */
1706  }
1707  }
1708 
1709  /* Is the rowtype fixed, or determined only at runtime? */
1710  if (get_func_result_type(func_id, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
1711  {
1712  /*
1713  * Assume we are returning the whole tuple. Crosschecking against
1714  * what the caller expects will happen at runtime.
1715  */
1716  if (junkFilter)
1717  *junkFilter = ExecInitJunkFilter(tlist, false, NULL);
1718  return true;
1719  }
1720  Assert(tupdesc);
1721 
1722  /*
1723  * Verify that the targetlist matches the return tuple type. We scan
1724  * the non-deleted attributes to ensure that they match the datatypes
1725  * of the non-resjunk columns. For deleted attributes, insert NULL
1726  * result columns if the caller asked for that.
1727  */
1728  tupnatts = tupdesc->natts;
1729  tuplogcols = 0; /* we'll count nondeleted cols as we go */
1730  colindex = 0;
1731  newtlist = NIL; /* these are only used if modifyTargetList */
1732  junkattrs = NIL;
1733 
1734  foreach(lc, tlist)
1735  {
1736  TargetEntry *tle = (TargetEntry *) lfirst(lc);
1737  Form_pg_attribute attr;
1738  Oid tletype;
1739  Oid atttype;
1740 
1741  if (tle->resjunk)
1742  {
1743  if (modifyTargetList)
1744  junkattrs = lappend(junkattrs, tle);
1745  continue;
1746  }
1747 
1748  do
1749  {
1750  colindex++;
1751  if (colindex > tupnatts)
1752  ereport(ERROR,
1753  (errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
1754  errmsg("return type mismatch in function declared to return %s",
1755  format_type_be(rettype)),
1756  errdetail("Final statement returns too many columns.")));
1757  attr = tupdesc->attrs[colindex - 1];
1758  if (attr->attisdropped && modifyTargetList)
1759  {
1760  Expr *null_expr;
1761 
1762  /* The type of the null we insert isn't important */
1763  null_expr = (Expr *) makeConst(INT4OID,
1764  -1,
1765  InvalidOid,
1766  sizeof(int32),
1767  (Datum) 0,
1768  true, /* isnull */
1769  true /* byval */ );
1770  newtlist = lappend(newtlist,
1771  makeTargetEntry(null_expr,
1772  colindex,
1773  NULL,
1774  false));
1775  /* NULL insertion is dangerous in a setop */
1776  if (parse->setOperations)
1777  *modifyTargetList = true;
1778  }
1779  } while (attr->attisdropped);
1780  tuplogcols++;
1781 
1782  tletype = exprType((Node *) tle->expr);
1783  atttype = attr->atttypid;
1784  if (!IsBinaryCoercible(tletype, atttype))
1785  ereport(ERROR,
1786  (errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
1787  errmsg("return type mismatch in function declared to return %s",
1788  format_type_be(rettype)),
1789  errdetail("Final statement returns %s instead of %s at column %d.",
1790  format_type_be(tletype),
1791  format_type_be(atttype),
1792  tuplogcols)));
1793  if (modifyTargetList)
1794  {
1795  if (tletype != atttype)
1796  {
1797  tle->expr = (Expr *) makeRelabelType(tle->expr,
1798  atttype,
1799  -1,
1800  get_typcollation(atttype),
1802  /* Relabel is dangerous if sort/group or setop column */
1803  if (tle->ressortgroupref != 0 || parse->setOperations)
1804  *modifyTargetList = true;
1805  }
1806  tle->resno = colindex;
1807  newtlist = lappend(newtlist, tle);
1808  }
1809  }
1810 
1811  /* remaining columns in tupdesc had better all be dropped */
1812  for (colindex++; colindex <= tupnatts; colindex++)
1813  {
1814  if (!tupdesc->attrs[colindex - 1]->attisdropped)
1815  ereport(ERROR,
1816  (errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
1817  errmsg("return type mismatch in function declared to return %s",
1818  format_type_be(rettype)),
1819  errdetail("Final statement returns too few columns.")));
1820  if (modifyTargetList)
1821  {
1822  Expr *null_expr;
1823 
1824  /* The type of the null we insert isn't important */
1825  null_expr = (Expr *) makeConst(INT4OID,
1826  -1,
1827  InvalidOid,
1828  sizeof(int32),
1829  (Datum) 0,
1830  true, /* isnull */
1831  true /* byval */ );
1832  newtlist = lappend(newtlist,
1833  makeTargetEntry(null_expr,
1834  colindex,
1835  NULL,
1836  false));
1837  /* NULL insertion is dangerous in a setop */
1838  if (parse->setOperations)
1839  *modifyTargetList = true;
1840  }
1841  }
1842 
1843  if (modifyTargetList)
1844  {
1845  /* ensure resjunk columns are numbered correctly */
1846  foreach(lc, junkattrs)
1847  {
1848  TargetEntry *tle = (TargetEntry *) lfirst(lc);
1849 
1850  tle->resno = colindex++;
1851  }
1852  /* replace the tlist with the modified one */
1853  *tlist_ptr = list_concat(newtlist, junkattrs);
1854  }
1855 
1856  /* Set up junk filter if needed */
1857  if (junkFilter)
1858  *junkFilter = ExecInitJunkFilterConversion(tlist,
1859  CreateTupleDescCopy(tupdesc),
1860  NULL);
1861 
1862  /* Report that we are returning entire tuple result */
1863  return true;
1864  }
1865  else
1866  ereport(ERROR,
1867  (errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
1868  errmsg("return type %s is not supported for SQL functions",
1869  format_type_be(rettype))));
1870 
1871  return false;
1872 }
1873 
1874 
1875 /*
1876  * CreateSQLFunctionDestReceiver -- create a suitable DestReceiver object
1877  */
1878 DestReceiver *
1880 {
1881  DR_sqlfunction *self = (DR_sqlfunction *) palloc0(sizeof(DR_sqlfunction));
1882 
1883  self->pub.receiveSlot = sqlfunction_receive;
1884  self->pub.rStartup = sqlfunction_startup;
1885  self->pub.rShutdown = sqlfunction_shutdown;
1886  self->pub.rDestroy = sqlfunction_destroy;
1887  self->pub.mydest = DestSQLFunction;
1888 
1889  /* private fields will be set by postquel_start */
1890 
1891  return (DestReceiver *) self;
1892 }
1893 
1894 /*
1895  * sqlfunction_startup --- executor startup
1896  */
1897 static void
1898 sqlfunction_startup(DestReceiver *self, int operation, TupleDesc typeinfo)
1899 {
1900  /* no-op */
1901 }
1902 
1903 /*
1904  * sqlfunction_receive --- receive one tuple
1905  */
1906 static bool
1908 {
1909  DR_sqlfunction *myState = (DR_sqlfunction *) self;
1910 
1911  /* Filter tuple as needed */
1912  slot = ExecFilterJunk(myState->filter, slot);
1913 
1914  /* Store the filtered tuple into the tuplestore */
1915  tuplestore_puttupleslot(myState->tstore, slot);
1916 
1917  return true;
1918 }
1919 
1920 /*
1921  * sqlfunction_shutdown --- executor end
1922  */
1923 static void
1925 {
1926  /* no-op */
1927 }
1928 
1929 /*
1930  * sqlfunction_destroy --- release DestReceiver object
1931  */
1932 static void
1934 {
1935  pfree(self);
1936 }
bool SubTransactionIsActive(SubTransactionId subxid)
Definition: xact.c:662
signed short int16
Definition: c.h:252
ParamExternData params[FLEXIBLE_ARRAY_MEMBER]
Definition: params.h:76
void tuplestore_puttupleslot(Tuplestorestate *state, TupleTableSlot *slot)
Definition: tuplestore.c:693
#define NIL
Definition: pg_list.h:69
Datum value
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bool CommandIsReadOnly(PlannedStmt *pstmt)
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#define TYPTYPE_DOMAIN
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static struct @76 value
TupleDesc CreateTupleDescCopy(TupleDesc tupdesc)
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void(* rDestroy)(DestReceiver *self)
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void UpdateActiveSnapshotCommandId(void)
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#define IsA(nodeptr, _type_)
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int stmt_location
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EState * estate
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DestReceiver pub
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PGPROC * MyProc
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CommandDest mydest
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struct SQLFunctionParseInfo * SQLFunctionParseInfoPtr
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Definition: execMain.c:138
Form_pg_attribute * attrs
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#define llast(l)
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static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
#define Anum_pg_proc_prosrc
Definition: pg_proc.h:115
Snapshot GetActiveSnapshot(void)
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#define INT4OID
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struct execution_state execution_state
ParamKind paramkind
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List * list_copy(const List *oldlist)
Definition: list.c:1160
Definition: nodes.h:508
void ExecutorRun(QueryDesc *queryDesc, ScanDirection direction, uint64 count)
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ExecStatus status
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int errcode(int sqlerrcode)
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TupleTableSlot * jf_resultSlot
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bool check_sql_fn_retval(Oid func_id, Oid rettype, List *queryTreeList, bool *modifyTargetList, JunkFilter **junkFilter)
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char get_typtype(Oid typid)
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static void sqlfunction_startup(DestReceiver *self, int operation, TupleDesc typeinfo)
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PostParseColumnRefHook p_post_columnref_hook
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signed int int32
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Snapshot snapshot
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ParamFetchHook paramFetch
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bool resjunk
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Oid paramcollid
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ParseParamRefHook p_paramref_hook
Definition: parse_node.h:204
void PushActiveSnapshot(Snapshot snap)
Definition: snapmgr.c:728
List * func_state
Definition: functions.c:119
struct SQLFunctionParseInfo SQLFunctionParseInfo
RelabelType * makeRelabelType(Expr *arg, Oid rtype, int32 rtypmod, Oid rcollid, CoercionForm rformat)
Definition: makefuncs.c:399
LocalTransactionId lxid
Definition: functions.c:124
TupleDesc jf_cleanTupType
Definition: execnodes.h:294
DestReceiver * CreateDestReceiver(CommandDest dest)
Definition: dest.c:109
JunkFilter * ExecInitJunkFilter(List *targetList, bool hasoid, TupleTableSlot *slot)
Definition: execJunk.c:61
int errdetail(const char *fmt,...)
Definition: elog.c:873
AttrNumber resno
Definition: primnodes.h:1331
ParamListInfo params
Definition: execdesc.h:42
Node * utilityStmt
Definition: plannodes.h:80
int geterrposition(void)
Definition: elog.c:1257
static Node * sql_fn_post_column_ref(ParseState *pstate, ColumnRef *cref, Node *var)
Definition: functions.c:286
static void ShutdownSQLFunction(Datum arg)
Definition: functions.c:1444
FormData_pg_attribute * Form_pg_attribute
Definition: pg_attribute.h:184
void(* ParserSetupHook)(struct ParseState *pstate, void *arg)
Definition: params.h:66
bool ActiveSnapshotSet(void)
Definition: snapmgr.c:846
static List * init_execution_state(List *queryTree_list, SQLFunctionCachePtr fcache, bool lazyEvalOK)
Definition: functions.c:472
struct Bitmapset * paramMask
Definition: params.h:75
#define Anum_pg_proc_proargmodes
Definition: pg_proc.h:111
#define RECORDOID
Definition: pg_type.h:668
bool argnull[FUNC_MAX_ARGS]
Definition: fmgr.h:78
MemoryContext CurrentMemoryContext
Definition: mcxt.c:37
uint32 LocalTransactionId
Definition: c.h:395
Datum fmgr_sql(PG_FUNCTION_ARGS)
Definition: functions.c:985
bool type_is_rowtype(Oid typid)
Definition: lsyscache.c:2372
List * returningList
Definition: parsenodes.h:135
#define lnext(lc)
Definition: pg_list.h:105
#define ereport(elevel, rest)
Definition: elog.h:122
TargetEntry * makeTargetEntry(Expr *expr, AttrNumber resno, char *resname, bool resjunk)
Definition: makefuncs.c:235
#define AssertArg(condition)
Definition: c.h:672
Datum datumCopy(Datum value, bool typByVal, int typLen)
Definition: datum.c:128
const char * CreateCommandTag(Node *parsetree)
Definition: utility.c:2012
void ExecutorFinish(QueryDesc *queryDesc)
Definition: execMain.c:379
int ExecCleanTargetListLength(List *targetlist)
Definition: execQual.c:5132
List * pg_analyze_and_rewrite_params(RawStmt *parsetree, const char *query_string, ParserSetupHook parserSetup, void *parserSetupArg)
Definition: postgres.c:679
SQLFunctionParseInfoPtr pinfo
Definition: functions.c:96
bool IsBinaryCoercible(Oid srctype, Oid targettype)
struct ParamExternData ParamExternData
#define PROVOLATILE_VOLATILE
Definition: pg_proc.h:5374
List * lappend(List *list, void *datum)
Definition: list.c:128
TypeFuncClass get_func_result_type(Oid functionId, Oid *resultTypeId, TupleDesc *resultTupleDesc)
Definition: funcapi.c:269
void ProcessUtility(PlannedStmt *pstmt, const char *queryString, ProcessUtilityContext context, ParamListInfo params, DestReceiver *dest, char *completionTag)
Definition: utility.c:332
#define Anum_pg_proc_proargnames
Definition: pg_proc.h:112
#define TYPTYPE_RANGE
Definition: pg_type.h:713
DestReceiver * CreateSQLFunctionDestReceiver(void)
Definition: functions.c:1879
CmdType operation
Definition: execdesc.h:36
#define InvalidSnapshot
Definition: snapshot.h:24
TupleDesc tts_tupleDescriptor
Definition: tuptable.h:121
Tuplestorestate * tuplestore_begin_heap(bool randomAccess, bool interXact, int maxKBytes)
Definition: tuplestore.c:316
int get_func_input_arg_names(Datum proargnames, Datum proargmodes, char ***arg_names)
Definition: funcapi.c:933
#define TextDatumGetCString(d)
Definition: builtins.h:91
bool canSetTag
Definition: plannodes.h:53
MemoryContext AllocSetContextCreate(MemoryContext parent, const char *name, Size minContextSize, Size initBlockSize, Size maxBlockSize)
Definition: aset.c:440
void * palloc0(Size size)
Definition: mcxt.c:920
ExecStatus
Definition: functions.c:58
uintptr_t Datum
Definition: postgres.h:374
TupleTableSlot * ExecFilterJunk(JunkFilter *junkfilter, TupleTableSlot *slot)
Definition: execJunk.c:262
void CommandCounterIncrement(void)
Definition: xact.c:921
CmdType commandType
Definition: plannodes.h:45
Oid get_fn_expr_rettype(FmgrInfo *flinfo)
Definition: fmgr.c:2198
void ReleaseSysCache(HeapTuple tuple)
Definition: syscache.c:1083
static void sqlfunction_shutdown(DestReceiver *self)
Definition: functions.c:1924
Datum SysCacheGetAttr(int cacheId, HeapTuple tup, AttrNumber attributeNumber, bool *isNull)
Definition: syscache.c:1245
int number
Definition: parsenodes.h:236
int work_mem
Definition: globals.c:112
FormData_pg_proc * Form_pg_proc
Definition: pg_proc.h:83
QueryDesc * qd
Definition: functions.c:70
#define InvalidOid
Definition: postgres_ext.h:36
Oid fn_oid
Definition: fmgr.h:56
Oid get_typcollation(Oid typid)
Definition: lsyscache.c:2749
int allowedModes
Definition: execnodes.h:199
int internalerrquery(const char *query)
Definition: elog.c:1161
Datum arg[FUNC_MAX_ARGS]
Definition: fmgr.h:77
CmdType commandType
Definition: parsenodes.h:103
int32 paramtypmod
Definition: primnodes.h:225
int location
Definition: parsenodes.h:237
SetFunctionReturnMode returnMode
Definition: execnodes.h:201
static Datum postquel_get_single_result(TupleTableSlot *slot, FunctionCallInfo fcinfo, SQLFunctionCachePtr fcache, MemoryContext resultcontext)
Definition: functions.c:942
#define makeNode(_type_)
Definition: nodes.h:556
bool tuplestore_gettupleslot(Tuplestorestate *state, bool forward, bool copy, TupleTableSlot *slot)
Definition: tuplestore.c:1061
#define HeapTupleIsValid(tuple)
Definition: htup.h:77
#define NULL
Definition: c.h:226
#define Assert(condition)
Definition: c.h:670
#define lfirst(lc)
Definition: pg_list.h:106
void RegisterExprContextCallback(ExprContext *econtext, ExprContextCallbackFunction function, Datum arg)
Definition: execUtils.c:871
void * p_ref_hook_state
Definition: parse_node.h:206
SubTransactionId GetCurrentSubTransactionId(void)
Definition: xact.c:648
fmNodePtr fn_expr
Definition: fmgr.h:63
bool hasModifyingCTE
Definition: plannodes.h:51
ParamListInfo paramLI
Definition: functions.c:107
Expr * expr
Definition: primnodes.h:1330
int paramid
Definition: primnodes.h:223
uint64 es_processed
Definition: execnodes.h:403
bool canSetTag
Definition: parsenodes.h:109
uint16 pflags
Definition: params.h:58
Oid exprType(const Node *expr)
Definition: nodeFuncs.c:42
static int list_length(const List *l)
Definition: pg_list.h:89
void tuplestore_end(Tuplestorestate *state)
Definition: tuplestore.c:450
void get_typlenbyval(Oid typid, int16 *typlen, bool *typbyval)
Definition: lsyscache.c:1969
static Node * sql_fn_param_ref(ParseState *pstate, ParamRef *pref)
Definition: functions.c:402
MemoryContext cxt
Definition: functions.c:45
void * fn_extra
Definition: fmgr.h:61
#define EXEC_FLAG_SKIP_TRIGGERS
Definition: executor.h:62
Tuplestorestate * setResult
Definition: execnodes.h:204
#define DatumGetPointer(X)
Definition: postgres.h:557
DestReceiver * dest
Definition: execdesc.h:41
ExprContext * econtext
Definition: execnodes.h:197
Node * setOperations
Definition: parsenodes.h:154
JunkFilter * filter
Definition: functions.c:46
#define CURSOR_OPT_PARALLEL_OK
Definition: parsenodes.h:2528
SQLFunctionCache * SQLFunctionCachePtr
Definition: functions.c:128
TupleDesc setDesc
Definition: execnodes.h:205
void(* callback)(void *arg)
Definition: elog.h:239
void * palloc(Size size)
Definition: mcxt.c:891
int errmsg(const char *fmt,...)
Definition: elog.c:797
int i
Datum slot_getattr(TupleTableSlot *slot, int attnum, bool *isnull)
Definition: heaptuple.c:1143
#define errcontext
Definition: elog.h:164
#define NameStr(name)
Definition: c.h:494
#define TYPTYPE_ENUM
Definition: pg_type.h:711
Index ressortgroupref
Definition: primnodes.h:1333
void * arg
#define lthird(l)
Definition: pg_list.h:118
static Node * sql_fn_make_param(SQLFunctionParseInfoPtr pinfo, int paramno, int location)
Definition: functions.c:418
#define PG_FUNCTION_ARGS
Definition: fmgr.h:150
#define elog
Definition: elog.h:219
PreParseColumnRefHook p_pre_columnref_hook
Definition: parse_node.h:202
ExprDoneCond isDone
Definition: execnodes.h:202
SQLFunctionParseInfoPtr prepare_sql_fn_parse_info(HeapTuple procedureTuple, Node *call_expr, Oid inputCollation)
Definition: functions.c:184
SubTransactionId subxid
Definition: functions.c:125
PlannedStmt * plannedstmt
Definition: execdesc.h:37
Datum ExecFetchSlotTupleDatum(TupleTableSlot *slot)
Definition: execTuples.c:698
struct execution_state * next
Definition: functions.c:65
PlannedStmt * stmt
Definition: functions.c:69
static bool postquel_getnext(execution_state *es, SQLFunctionCachePtr fcache)
Definition: functions.c:839
Definition: pg_list.h:45
bool isnull
Definition: params.h:57
int stmt_len
Definition: parsenodes.h:172
static void postquel_sub_params(SQLFunctionCachePtr fcache, FunctionCallInfo fcinfo)
Definition: functions.c:892
Oid paramtype
Definition: primnodes.h:224
#define offsetof(type, field)
Definition: c.h:550
int errposition(int cursorpos)
Definition: elog.c:1125
List * fields
Definition: parsenodes.h:226
static void init_sql_fcache(FmgrInfo *finfo, Oid collation, bool lazyEvalOK)
Definition: functions.c:593
static struct subre * parse(struct vars *, int, int, struct state *, struct state *)
Definition: regcomp.c:651
LocalTransactionId lxid
Definition: proc.h:95
int internalerrposition(int cursorpos)
Definition: elog.c:1141
Tuplestorestate * tstore
Definition: functions.c:44
PlannedStmt * pg_plan_query(Query *querytree, int cursorOptions, ParamListInfo boundParams)
Definition: postgres.c:781