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parse_func.c
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1 /*-------------------------------------------------------------------------
2  *
3  * parse_func.c
4  * handle function calls in parser
5  *
6  * Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
7  * Portions Copyright (c) 1994, Regents of the University of California
8  *
9  *
10  * IDENTIFICATION
11  * src/backend/parser/parse_func.c
12  *
13  *-------------------------------------------------------------------------
14  */
15 #include "postgres.h"
16 
17 #include "access/htup_details.h"
18 #include "catalog/pg_aggregate.h"
19 #include "catalog/pg_proc.h"
20 #include "catalog/pg_type.h"
21 #include "funcapi.h"
22 #include "lib/stringinfo.h"
23 #include "nodes/makefuncs.h"
24 #include "nodes/nodeFuncs.h"
25 #include "parser/parse_agg.h"
26 #include "parser/parse_clause.h"
27 #include "parser/parse_coerce.h"
28 #include "parser/parse_expr.h"
29 #include "parser/parse_func.h"
30 #include "parser/parse_relation.h"
31 #include "parser/parse_target.h"
32 #include "parser/parse_type.h"
33 #include "utils/builtins.h"
34 #include "utils/lsyscache.h"
35 #include "utils/syscache.h"
36 
37 
38 /* Possible error codes from LookupFuncNameInternal */
39 typedef enum
40 {
41  FUNCLOOKUP_NOSUCHFUNC,
42  FUNCLOOKUP_AMBIGUOUS
43 } FuncLookupError;
44 
45 static void unify_hypothetical_args(ParseState *pstate,
46  List *fargs, int numAggregatedArgs,
47  Oid *actual_arg_types, Oid *declared_arg_types);
48 static Oid FuncNameAsType(List *funcname);
49 static Node *ParseComplexProjection(ParseState *pstate, const char *funcname,
50  Node *first_arg, int location);
51 static Oid LookupFuncNameInternal(ObjectType objtype, List *funcname,
52  int nargs, const Oid *argtypes,
53  bool include_out_arguments, bool missing_ok,
54  FuncLookupError *lookupError);
55 
56 
57 /*
58  * Parse a function call
59  *
60  * For historical reasons, Postgres tries to treat the notations tab.col
61  * and col(tab) as equivalent: if a single-argument function call has an
62  * argument of complex type and the (unqualified) function name matches
63  * any attribute of the type, we can interpret it as a column projection.
64  * Conversely a function of a single complex-type argument can be written
65  * like a column reference, allowing functions to act like computed columns.
66  *
67  * If both interpretations are possible, we prefer the one matching the
68  * syntactic form, but otherwise the form does not matter.
69  *
70  * Hence, both cases come through here. If fn is null, we're dealing with
71  * column syntax not function syntax. In the function-syntax case,
72  * the FuncCall struct is needed to carry various decoration that applies
73  * to aggregate and window functions.
74  *
75  * Also, when fn is null, we return NULL on failure rather than
76  * reporting a no-such-function error.
77  *
78  * The argument expressions (in fargs) must have been transformed
79  * already. However, nothing in *fn has been transformed.
80  *
81  * last_srf should be a copy of pstate->p_last_srf from just before we
82  * started transforming fargs. If the caller knows that fargs couldn't
83  * contain any SRF calls, last_srf can just be pstate->p_last_srf.
84  *
85  * proc_call is true if we are considering a CALL statement, so that the
86  * name must resolve to a procedure name, not anything else. This flag
87  * also specifies that the argument list includes any OUT-mode arguments.
88  */
89 Node *
90 ParseFuncOrColumn(ParseState *pstate, List *funcname, List *fargs,
91  Node *last_srf, FuncCall *fn, bool proc_call, int location)
92 {
93  bool is_column = (fn == NULL);
94  List *agg_order = (fn ? fn->agg_order : NIL);
95  Expr *agg_filter = NULL;
96  WindowDef *over = (fn ? fn->over : NULL);
97  bool agg_within_group = (fn ? fn->agg_within_group : false);
98  bool agg_star = (fn ? fn->agg_star : false);
99  bool agg_distinct = (fn ? fn->agg_distinct : false);
100  bool func_variadic = (fn ? fn->func_variadic : false);
101  CoercionForm funcformat = (fn ? fn->funcformat : COERCE_EXPLICIT_CALL);
102  bool could_be_projection;
103  Oid rettype;
104  Oid funcid;
105  ListCell *l;
106  Node *first_arg = NULL;
107  int nargs;
108  int nargsplusdefs;
109  Oid actual_arg_types[FUNC_MAX_ARGS];
110  Oid *declared_arg_types;
111  List *argnames;
112  List *argdefaults;
113  Node *retval;
114  bool retset;
115  int nvargs;
116  Oid vatype;
117  FuncDetailCode fdresult;
118  char aggkind = 0;
119  ParseCallbackState pcbstate;
120 
121  /*
122  * If there's an aggregate filter, transform it using transformWhereClause
123  */
124  if (fn && fn->agg_filter != NULL)
125  agg_filter = (Expr *) transformWhereClause(pstate, fn->agg_filter,
126  EXPR_KIND_FILTER,
127  "FILTER");
128 
129  /*
130  * Most of the rest of the parser just assumes that functions do not have
131  * more than FUNC_MAX_ARGS parameters. We have to test here to protect
132  * against array overruns, etc. Of course, this may not be a function,
133  * but the test doesn't hurt.
134  */
135  if (list_length(fargs) > FUNC_MAX_ARGS)
136  ereport(ERROR,
137  (errcode(ERRCODE_TOO_MANY_ARGUMENTS),
138  errmsg_plural("cannot pass more than %d argument to a function",
139  "cannot pass more than %d arguments to a function",
140  FUNC_MAX_ARGS,
141  FUNC_MAX_ARGS),
142  parser_errposition(pstate, location)));
143 
144  /*
145  * Extract arg type info in preparation for function lookup.
146  *
147  * If any arguments are Param markers of type VOID, we discard them from
148  * the parameter list. This is a hack to allow the JDBC driver to not have
149  * to distinguish "input" and "output" parameter symbols while parsing
150  * function-call constructs. Don't do this if dealing with column syntax,
151  * nor if we had WITHIN GROUP (because in that case it's critical to keep
152  * the argument count unchanged).
153  */
154  nargs = 0;
155  foreach(l, fargs)
156  {
157  Node *arg = lfirst(l);
158  Oid argtype = exprType(arg);
159 
160  if (argtype == VOIDOID && IsA(arg, Param) &&
161  !is_column && !agg_within_group)
162  {
163  fargs = foreach_delete_current(fargs, l);
164  continue;
165  }
166 
167  actual_arg_types[nargs++] = argtype;
168  }
169 
170  /*
171  * Check for named arguments; if there are any, build a list of names.
172  *
173  * We allow mixed notation (some named and some not), but only with all
174  * the named parameters after all the unnamed ones. So the name list
175  * corresponds to the last N actual parameters and we don't need any extra
176  * bookkeeping to match things up.
177  */
178  argnames = NIL;
179  foreach(l, fargs)
180  {
181  Node *arg = lfirst(l);
182 
183  if (IsA(arg, NamedArgExpr))
184  {
185  NamedArgExpr *na = (NamedArgExpr *) arg;
186  ListCell *lc;
187 
188  /* Reject duplicate arg names */
189  foreach(lc, argnames)
190  {
191  if (strcmp(na->name, (char *) lfirst(lc)) == 0)
192  ereport(ERROR,
193  (errcode(ERRCODE_SYNTAX_ERROR),
194  errmsg("argument name \"%s\" used more than once",
195  na->name),
196  parser_errposition(pstate, na->location)));
197  }
198  argnames = lappend(argnames, na->name);
199  }
200  else
201  {
202  if (argnames != NIL)
203  ereport(ERROR,
204  (errcode(ERRCODE_SYNTAX_ERROR),
205  errmsg("positional argument cannot follow named argument"),
206  parser_errposition(pstate, exprLocation(arg))));
207  }
208  }
209 
210  if (fargs)
211  {
212  first_arg = linitial(fargs);
213  Assert(first_arg != NULL);
214  }
215 
216  /*
217  * Decide whether it's legitimate to consider the construct to be a column
218  * projection. For that, there has to be a single argument of complex
219  * type, the function name must not be qualified, and there cannot be any
220  * syntactic decoration that'd require it to be a function (such as
221  * aggregate or variadic decoration, or named arguments).
222  */
223  could_be_projection = (nargs == 1 && !proc_call &&
224  agg_order == NIL && agg_filter == NULL &&
225  !agg_star && !agg_distinct && over == NULL &&
226  !func_variadic && argnames == NIL &&
227  list_length(funcname) == 1 &&
228  (actual_arg_types[0] == RECORDOID ||
229  ISCOMPLEX(actual_arg_types[0])));
230 
231  /*
232  * If it's column syntax, check for column projection case first.
233  */
234  if (could_be_projection && is_column)
235  {
236  retval = ParseComplexProjection(pstate,
237  strVal(linitial(funcname)),
238  first_arg,
239  location);
240  if (retval)
241  return retval;
242 
243  /*
244  * If ParseComplexProjection doesn't recognize it as a projection,
245  * just press on.
246  */
247  }
248 
249  /*
250  * func_get_detail looks up the function in the catalogs, does
251  * disambiguation for polymorphic functions, handles inheritance, and
252  * returns the funcid and type and set or singleton status of the
253  * function's return value. It also returns the true argument types to
254  * the function.
255  *
256  * Note: for a named-notation or variadic function call, the reported
257  * "true" types aren't really what is in pg_proc: the types are reordered
258  * to match the given argument order of named arguments, and a variadic
259  * argument is replaced by a suitable number of copies of its element
260  * type. We'll fix up the variadic case below. We may also have to deal
261  * with default arguments.
262  */
263 
264  setup_parser_errposition_callback(&pcbstate, pstate, location);
265 
266  fdresult = func_get_detail(funcname, fargs, argnames, nargs,
267  actual_arg_types,
268  !func_variadic, true, proc_call,
269  &funcid, &rettype, &retset,
270  &nvargs, &vatype,
271  &declared_arg_types, &argdefaults);
272 
273  cancel_parser_errposition_callback(&pcbstate);
274 
275  /*
276  * Check for various wrong-kind-of-routine cases.
277  */
278 
279  /* If this is a CALL, reject things that aren't procedures */
280  if (proc_call &&
281  (fdresult == FUNCDETAIL_NORMAL ||
282  fdresult == FUNCDETAIL_AGGREGATE ||
283  fdresult == FUNCDETAIL_WINDOWFUNC ||
284  fdresult == FUNCDETAIL_COERCION))
285  ereport(ERROR,
286  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
287  errmsg("%s is not a procedure",
288  func_signature_string(funcname, nargs,
289  argnames,
290  actual_arg_types)),
291  errhint("To call a function, use SELECT."),
292  parser_errposition(pstate, location)));
293  /* Conversely, if not a CALL, reject procedures */
294  if (fdresult == FUNCDETAIL_PROCEDURE && !proc_call)
295  ereport(ERROR,
296  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
297  errmsg("%s is a procedure",
298  func_signature_string(funcname, nargs,
299  argnames,
300  actual_arg_types)),
301  errhint("To call a procedure, use CALL."),
302  parser_errposition(pstate, location)));
303 
304  if (fdresult == FUNCDETAIL_NORMAL ||
305  fdresult == FUNCDETAIL_PROCEDURE ||
306  fdresult == FUNCDETAIL_COERCION)
307  {
308  /*
309  * In these cases, complain if there was anything indicating it must
310  * be an aggregate or window function.
311  */
312  if (agg_star)
313  ereport(ERROR,
314  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
315  errmsg("%s(*) specified, but %s is not an aggregate function",
316  NameListToString(funcname),
317  NameListToString(funcname)),
318  parser_errposition(pstate, location)));
319  if (agg_distinct)
320  ereport(ERROR,
321  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
322  errmsg("DISTINCT specified, but %s is not an aggregate function",
323  NameListToString(funcname)),
324  parser_errposition(pstate, location)));
325  if (agg_within_group)
326  ereport(ERROR,
327  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
328  errmsg("WITHIN GROUP specified, but %s is not an aggregate function",
329  NameListToString(funcname)),
330  parser_errposition(pstate, location)));
331  if (agg_order != NIL)
332  ereport(ERROR,
333  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
334  errmsg("ORDER BY specified, but %s is not an aggregate function",
335  NameListToString(funcname)),
336  parser_errposition(pstate, location)));
337  if (agg_filter)
338  ereport(ERROR,
339  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
340  errmsg("FILTER specified, but %s is not an aggregate function",
341  NameListToString(funcname)),
342  parser_errposition(pstate, location)));
343  if (over)
344  ereport(ERROR,
345  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
346  errmsg("OVER specified, but %s is not a window function nor an aggregate function",
347  NameListToString(funcname)),
348  parser_errposition(pstate, location)));
349  }
350 
351  /*
352  * So far so good, so do some fdresult-type-specific processing.
353  */
354  if (fdresult == FUNCDETAIL_NORMAL || fdresult == FUNCDETAIL_PROCEDURE)
355  {
356  /* Nothing special to do for these cases. */
357  }
358  else if (fdresult == FUNCDETAIL_AGGREGATE)
359  {
360  /*
361  * It's an aggregate; fetch needed info from the pg_aggregate entry.
362  */
363  HeapTuple tup;
364  Form_pg_aggregate classForm;
365  int catDirectArgs;
366 
367  tup = SearchSysCache1(AGGFNOID, ObjectIdGetDatum(funcid));
368  if (!HeapTupleIsValid(tup)) /* should not happen */
369  elog(ERROR, "cache lookup failed for aggregate %u", funcid);
370  classForm = (Form_pg_aggregate) GETSTRUCT(tup);
371  aggkind = classForm->aggkind;
372  catDirectArgs = classForm->aggnumdirectargs;
373  ReleaseSysCache(tup);
374 
375  /* Now check various disallowed cases. */
376  if (AGGKIND_IS_ORDERED_SET(aggkind))
377  {
378  int numAggregatedArgs;
379  int numDirectArgs;
380 
381  if (!agg_within_group)
382  ereport(ERROR,
383  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
384  errmsg("WITHIN GROUP is required for ordered-set aggregate %s",
385  NameListToString(funcname)),
386  parser_errposition(pstate, location)));
387  if (over)
388  ereport(ERROR,
389  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
390  errmsg("OVER is not supported for ordered-set aggregate %s",
391  NameListToString(funcname)),
392  parser_errposition(pstate, location)));
393  /* gram.y rejects DISTINCT + WITHIN GROUP */
394  Assert(!agg_distinct);
395  /* gram.y rejects VARIADIC + WITHIN GROUP */
396  Assert(!func_variadic);
397 
398  /*
399  * Since func_get_detail was working with an undifferentiated list
400  * of arguments, it might have selected an aggregate that doesn't
401  * really match because it requires a different division of direct
402  * and aggregated arguments. Check that the number of direct
403  * arguments is actually OK; if not, throw an "undefined function"
404  * error, similarly to the case where a misplaced ORDER BY is used
405  * in a regular aggregate call.
406  */
407  numAggregatedArgs = list_length(agg_order);
408  numDirectArgs = nargs - numAggregatedArgs;
409  Assert(numDirectArgs >= 0);
410 
411  if (!OidIsValid(vatype))
412  {
413  /* Test is simple if aggregate isn't variadic */
414  if (numDirectArgs != catDirectArgs)
415  ereport(ERROR,
416  (errcode(ERRCODE_UNDEFINED_FUNCTION),
417  errmsg("function %s does not exist",
418  func_signature_string(funcname, nargs,
419  argnames,
420  actual_arg_types)),
421  errhint_plural("There is an ordered-set aggregate %s, but it requires %d direct argument, not %d.",
422  "There is an ordered-set aggregate %s, but it requires %d direct arguments, not %d.",
423  catDirectArgs,
424  NameListToString(funcname),
425  catDirectArgs, numDirectArgs),
426  parser_errposition(pstate, location)));
427  }
428  else
429  {
430  /*
431  * If it's variadic, we have two cases depending on whether
432  * the agg was "... ORDER BY VARIADIC" or "..., VARIADIC ORDER
433  * BY VARIADIC". It's the latter if catDirectArgs equals
434  * pronargs; to save a catalog lookup, we reverse-engineer
435  * pronargs from the info we got from func_get_detail.
436  */
437  int pronargs;
438 
439  pronargs = nargs;
440  if (nvargs > 1)
441  pronargs -= nvargs - 1;
442  if (catDirectArgs < pronargs)
443  {
444  /* VARIADIC isn't part of direct args, so still easy */
445  if (numDirectArgs != catDirectArgs)
446  ereport(ERROR,
447  (errcode(ERRCODE_UNDEFINED_FUNCTION),
448  errmsg("function %s does not exist",
449  func_signature_string(funcname, nargs,
450  argnames,
451  actual_arg_types)),
452  errhint_plural("There is an ordered-set aggregate %s, but it requires %d direct argument, not %d.",
453  "There is an ordered-set aggregate %s, but it requires %d direct arguments, not %d.",
454  catDirectArgs,
455  NameListToString(funcname),
456  catDirectArgs, numDirectArgs),
457  parser_errposition(pstate, location)));
458  }
459  else
460  {
461  /*
462  * Both direct and aggregated args were declared variadic.
463  * For a standard ordered-set aggregate, it's okay as long
464  * as there aren't too few direct args. For a
465  * hypothetical-set aggregate, we assume that the
466  * hypothetical arguments are those that matched the
467  * variadic parameter; there must be just as many of them
468  * as there are aggregated arguments.
469  */
470  if (aggkind == AGGKIND_HYPOTHETICAL)
471  {
472  if (nvargs != 2 * numAggregatedArgs)
473  ereport(ERROR,
474  (errcode(ERRCODE_UNDEFINED_FUNCTION),
475  errmsg("function %s does not exist",
476  func_signature_string(funcname, nargs,
477  argnames,
478  actual_arg_types)),
479  errhint("To use the hypothetical-set aggregate %s, the number of hypothetical direct arguments (here %d) must match the number of ordering columns (here %d).",
480  NameListToString(funcname),
481  nvargs - numAggregatedArgs, numAggregatedArgs),
482  parser_errposition(pstate, location)));
483  }
484  else
485  {
486  if (nvargs <= numAggregatedArgs)
487  ereport(ERROR,
488  (errcode(ERRCODE_UNDEFINED_FUNCTION),
489  errmsg("function %s does not exist",
490  func_signature_string(funcname, nargs,
491  argnames,
492  actual_arg_types)),
493  errhint_plural("There is an ordered-set aggregate %s, but it requires at least %d direct argument.",
494  "There is an ordered-set aggregate %s, but it requires at least %d direct arguments.",
495  catDirectArgs,
496  NameListToString(funcname),
497  catDirectArgs),
498  parser_errposition(pstate, location)));
499  }
500  }
501  }
502 
503  /* Check type matching of hypothetical arguments */
504  if (aggkind == AGGKIND_HYPOTHETICAL)
505  unify_hypothetical_args(pstate, fargs, numAggregatedArgs,
506  actual_arg_types, declared_arg_types);
507  }
508  else
509  {
510  /* Normal aggregate, so it can't have WITHIN GROUP */
511  if (agg_within_group)
512  ereport(ERROR,
513  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
514  errmsg("%s is not an ordered-set aggregate, so it cannot have WITHIN GROUP",
515  NameListToString(funcname)),
516  parser_errposition(pstate, location)));
517  }
518  }
519  else if (fdresult == FUNCDETAIL_WINDOWFUNC)
520  {
521  /*
522  * True window functions must be called with a window definition.
523  */
524  if (!over)
525  ereport(ERROR,
526  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
527  errmsg("window function %s requires an OVER clause",
528  NameListToString(funcname)),
529  parser_errposition(pstate, location)));
530  /* And, per spec, WITHIN GROUP isn't allowed */
531  if (agg_within_group)
532  ereport(ERROR,
533  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
534  errmsg("window function %s cannot have WITHIN GROUP",
535  NameListToString(funcname)),
536  parser_errposition(pstate, location)));
537  }
538  else if (fdresult == FUNCDETAIL_COERCION)
539  {
540  /*
541  * We interpreted it as a type coercion. coerce_type can handle these
542  * cases, so why duplicate code...
543  */
544  return coerce_type(pstate, linitial(fargs),
545  actual_arg_types[0], rettype, -1,
546  COERCION_EXPLICIT, COERCE_EXPLICIT_CALL, location);
547  }
548  else if (fdresult == FUNCDETAIL_MULTIPLE)
549  {
550  /*
551  * We found multiple possible functional matches. If we are dealing
552  * with attribute notation, return failure, letting the caller report
553  * "no such column" (we already determined there wasn't one). If
554  * dealing with function notation, report "ambiguous function",
555  * regardless of whether there's also a column by this name.
556  */
557  if (is_column)
558  return NULL;
559 
560  if (proc_call)
561  ereport(ERROR,
562  (errcode(ERRCODE_AMBIGUOUS_FUNCTION),
563  errmsg("procedure %s is not unique",
564  func_signature_string(funcname, nargs, argnames,
565  actual_arg_types)),
566  errhint("Could not choose a best candidate procedure. "
567  "You might need to add explicit type casts."),
568  parser_errposition(pstate, location)));
569  else
570  ereport(ERROR,
571  (errcode(ERRCODE_AMBIGUOUS_FUNCTION),
572  errmsg("function %s is not unique",
573  func_signature_string(funcname, nargs, argnames,
574  actual_arg_types)),
575  errhint("Could not choose a best candidate function. "
576  "You might need to add explicit type casts."),
577  parser_errposition(pstate, location)));
578  }
579  else
580  {
581  /*
582  * Not found as a function. If we are dealing with attribute
583  * notation, return failure, letting the caller report "no such
584  * column" (we already determined there wasn't one).
585  */
586  if (is_column)
587  return NULL;
588 
589  /*
590  * Check for column projection interpretation, since we didn't before.
591  */
592  if (could_be_projection)
593  {
594  retval = ParseComplexProjection(pstate,
595  strVal(linitial(funcname)),
596  first_arg,
597  location);
598  if (retval)
599  return retval;
600  }
601 
602  /*
603  * No function, and no column either. Since we're dealing with
604  * function notation, report "function does not exist".
605  */
606  if (list_length(agg_order) > 1 && !agg_within_group)
607  {
608  /* It's agg(x, ORDER BY y,z) ... perhaps misplaced ORDER BY */
609  ereport(ERROR,
610  (errcode(ERRCODE_UNDEFINED_FUNCTION),
611  errmsg("function %s does not exist",
612  func_signature_string(funcname, nargs, argnames,
613  actual_arg_types)),
614  errhint("No aggregate function matches the given name and argument types. "
615  "Perhaps you misplaced ORDER BY; ORDER BY must appear "
616  "after all regular arguments of the aggregate."),
617  parser_errposition(pstate, location)));
618  }
619  else if (proc_call)
620  ereport(ERROR,
621  (errcode(ERRCODE_UNDEFINED_FUNCTION),
622  errmsg("procedure %s does not exist",
623  func_signature_string(funcname, nargs, argnames,
624  actual_arg_types)),
625  errhint("No procedure matches the given name and argument types. "
626  "You might need to add explicit type casts."),
627  parser_errposition(pstate, location)));
628  else
629  ereport(ERROR,
630  (errcode(ERRCODE_UNDEFINED_FUNCTION),
631  errmsg("function %s does not exist",
632  func_signature_string(funcname, nargs, argnames,
633  actual_arg_types)),
634  errhint("No function matches the given name and argument types. "
635  "You might need to add explicit type casts."),
636  parser_errposition(pstate, location)));
637  }
638 
639  /*
640  * If there are default arguments, we have to include their types in
641  * actual_arg_types for the purpose of checking generic type consistency.
642  * However, we do NOT put them into the generated parse node, because
643  * their actual values might change before the query gets run. The
644  * planner has to insert the up-to-date values at plan time.
645  */
646  nargsplusdefs = nargs;
647  foreach(l, argdefaults)
648  {
649  Node *expr = (Node *) lfirst(l);
650 
651  /* probably shouldn't happen ... */
652  if (nargsplusdefs >= FUNC_MAX_ARGS)
653  ereport(ERROR,
654  (errcode(ERRCODE_TOO_MANY_ARGUMENTS),
655  errmsg_plural("cannot pass more than %d argument to a function",
656  "cannot pass more than %d arguments to a function",
657  FUNC_MAX_ARGS,
658  FUNC_MAX_ARGS),
659  parser_errposition(pstate, location)));
660 
661  actual_arg_types[nargsplusdefs++] = exprType(expr);
662  }
663 
664  /*
665  * enforce consistency with polymorphic argument and return types,
666  * possibly adjusting return type or declared_arg_types (which will be
667  * used as the cast destination by make_fn_arguments)
668  */
669  rettype = enforce_generic_type_consistency(actual_arg_types,
670  declared_arg_types,
671  nargsplusdefs,
672  rettype,
673  false);
674 
675  /* perform the necessary typecasting of arguments */
676  make_fn_arguments(pstate, fargs, actual_arg_types, declared_arg_types);
677 
678  /*
679  * If the function isn't actually variadic, forget any VARIADIC decoration
680  * on the call. (Perhaps we should throw an error instead, but
681  * historically we've allowed people to write that.)
682  */
683  if (!OidIsValid(vatype))
684  {
685  Assert(nvargs == 0);
686  func_variadic = false;
687  }
688 
689  /*
690  * If it's a variadic function call, transform the last nvargs arguments
691  * into an array --- unless it's an "any" variadic.
692  */
693  if (nvargs > 0 && vatype != ANYOID)
694  {
695  ArrayExpr *newa = makeNode(ArrayExpr);
696  int non_var_args = nargs - nvargs;
697  List *vargs;
698 
699  Assert(non_var_args >= 0);
700  vargs = list_copy_tail(fargs, non_var_args);
701  fargs = list_truncate(fargs, non_var_args);
702 
703  newa->elements = vargs;
704  /* assume all the variadic arguments were coerced to the same type */
705  newa->element_typeid = exprType((Node *) linitial(vargs));
706  newa->array_typeid = get_array_type(newa->element_typeid);
707  if (!OidIsValid(newa->array_typeid))
708  ereport(ERROR,
709  (errcode(ERRCODE_UNDEFINED_OBJECT),
710  errmsg("could not find array type for data type %s",
711  format_type_be(newa->element_typeid)),
712  parser_errposition(pstate, exprLocation((Node *) vargs))));
713  /* array_collid will be set by parse_collate.c */
714  newa->multidims = false;
715  newa->location = exprLocation((Node *) vargs);
716 
717  fargs = lappend(fargs, newa);
718 
719  /* We could not have had VARIADIC marking before ... */
720  Assert(!func_variadic);
721  /* ... but now, it's a VARIADIC call */
722  func_variadic = true;
723  }
724 
725  /*
726  * If an "any" variadic is called with explicit VARIADIC marking, insist
727  * that the variadic parameter be of some array type.
728  */
729  if (nargs > 0 && vatype == ANYOID && func_variadic)
730  {
731  Oid va_arr_typid = actual_arg_types[nargs - 1];
732 
733  if (!OidIsValid(get_base_element_type(va_arr_typid)))
734  ereport(ERROR,
735  (errcode(ERRCODE_DATATYPE_MISMATCH),
736  errmsg("VARIADIC argument must be an array"),
737  parser_errposition(pstate,
738  exprLocation((Node *) llast(fargs)))));
739  }
740 
741  /* if it returns a set, check that's OK */
742  if (retset)
743  check_srf_call_placement(pstate, last_srf, location);
744 
745  /* build the appropriate output structure */
746  if (fdresult == FUNCDETAIL_NORMAL || fdresult == FUNCDETAIL_PROCEDURE)
747  {
748  FuncExpr *funcexpr = makeNode(FuncExpr);
749 
750  funcexpr->funcid = funcid;
751  funcexpr->funcresulttype = rettype;
752  funcexpr->funcretset = retset;
753  funcexpr->funcvariadic = func_variadic;
754  funcexpr->funcformat = funcformat;
755  /* funccollid and inputcollid will be set by parse_collate.c */
756  funcexpr->args = fargs;
757  funcexpr->location = location;
758 
759  retval = (Node *) funcexpr;
760  }
761  else if (fdresult == FUNCDETAIL_AGGREGATE && !over)
762  {
763  /* aggregate function */
764  Aggref *aggref = makeNode(Aggref);
765 
766  aggref->aggfnoid = funcid;
767  aggref->aggtype = rettype;
768  /* aggcollid and inputcollid will be set by parse_collate.c */
769  aggref->aggtranstype = InvalidOid; /* will be set by planner */
770  /* aggargtypes will be set by transformAggregateCall */
771  /* aggdirectargs and args will be set by transformAggregateCall */
772  /* aggorder and aggdistinct will be set by transformAggregateCall */
773  aggref->aggfilter = agg_filter;
774  aggref->aggstar = agg_star;
775  aggref->aggvariadic = func_variadic;
776  aggref->aggkind = aggkind;
777  aggref->aggpresorted = false;
778  /* agglevelsup will be set by transformAggregateCall */
779  aggref->aggsplit = AGGSPLIT_SIMPLE; /* planner might change this */
780  aggref->aggno = -1; /* planner will set aggno and aggtransno */
781  aggref->aggtransno = -1;
782  aggref->location = location;
783 
784  /*
785  * Reject attempt to call a parameterless aggregate without (*)
786  * syntax. This is mere pedantry but some folks insisted ...
787  */
788  if (fargs == NIL && !agg_star && !agg_within_group)
789  ereport(ERROR,
790  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
791  errmsg("%s(*) must be used to call a parameterless aggregate function",
792  NameListToString(funcname)),
793  parser_errposition(pstate, location)));
794 
795  if (retset)
796  ereport(ERROR,
797  (errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
798  errmsg("aggregates cannot return sets"),
799  parser_errposition(pstate, location)));
800 
801  /*
802  * We might want to support named arguments later, but disallow it for
803  * now. We'd need to figure out the parsed representation (should the
804  * NamedArgExprs go above or below the TargetEntry nodes?) and then
805  * teach the planner to reorder the list properly. Or maybe we could
806  * make transformAggregateCall do that? However, if you'd also like
807  * to allow default arguments for aggregates, we'd need to do it in
808  * planning to avoid semantic problems.
809  */
810  if (argnames != NIL)
811  ereport(ERROR,
812  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
813  errmsg("aggregates cannot use named arguments"),
814  parser_errposition(pstate, location)));
815 
816  /* parse_agg.c does additional aggregate-specific processing */
817  transformAggregateCall(pstate, aggref, fargs, agg_order, agg_distinct);
818 
819  retval = (Node *) aggref;
820  }
821  else
822  {
823  /* window function */
824  WindowFunc *wfunc = makeNode(WindowFunc);
825 
826  Assert(over); /* lack of this was checked above */
827  Assert(!agg_within_group); /* also checked above */
828 
829  wfunc->winfnoid = funcid;
830  wfunc->wintype = rettype;
831  /* wincollid and inputcollid will be set by parse_collate.c */
832  wfunc->args = fargs;
833  /* winref will be set by transformWindowFuncCall */
834  wfunc->winstar = agg_star;
835  wfunc->winagg = (fdresult == FUNCDETAIL_AGGREGATE);
836  wfunc->aggfilter = agg_filter;
837  wfunc->location = location;
838 
839  /*
840  * agg_star is allowed for aggregate functions but distinct isn't
841  */
842  if (agg_distinct)
843  ereport(ERROR,
844  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
845  errmsg("DISTINCT is not implemented for window functions"),
846  parser_errposition(pstate, location)));
847 
848  /*
849  * Reject attempt to call a parameterless aggregate without (*)
850  * syntax. This is mere pedantry but some folks insisted ...
851  */
852  if (wfunc->winagg && fargs == NIL && !agg_star)
853  ereport(ERROR,
854  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
855  errmsg("%s(*) must be used to call a parameterless aggregate function",
856  NameListToString(funcname)),
857  parser_errposition(pstate, location)));
858 
859  /*
860  * ordered aggs not allowed in windows yet
861  */
862  if (agg_order != NIL)
863  ereport(ERROR,
864  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
865  errmsg("aggregate ORDER BY is not implemented for window functions"),
866  parser_errposition(pstate, location)));
867 
868  /*
869  * FILTER is not yet supported with true window functions
870  */
871  if (!wfunc->winagg && agg_filter)
872  ereport(ERROR,
873  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
874  errmsg("FILTER is not implemented for non-aggregate window functions"),
875  parser_errposition(pstate, location)));
876 
877  /*
878  * Window functions can't either take or return sets
879  */
880  if (pstate->p_last_srf != last_srf)
881  ereport(ERROR,
882  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
883  errmsg("window function calls cannot contain set-returning function calls"),
884  errhint("You might be able to move the set-returning function into a LATERAL FROM item."),
885  parser_errposition(pstate,
886  exprLocation(pstate->p_last_srf))));
887 
888  if (retset)
889  ereport(ERROR,
890  (errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
891  errmsg("window functions cannot return sets"),
892  parser_errposition(pstate, location)));
893 
894  /* parse_agg.c does additional window-func-specific processing */
895  transformWindowFuncCall(pstate, wfunc, over);
896 
897  retval = (Node *) wfunc;
898  }
899 
900  /* if it returns a set, remember it for error checks at higher levels */
901  if (retset)
902  pstate->p_last_srf = retval;
903 
904  return retval;
905 }
906 
907 
908 /* func_match_argtypes()
909  *
910  * Given a list of candidate functions (having the right name and number
911  * of arguments) and an array of input datatype OIDs, produce a shortlist of
912  * those candidates that actually accept the input datatypes (either exactly
913  * or by coercion), and return the number of such candidates.
914  *
915  * Note that can_coerce_type will assume that UNKNOWN inputs are coercible to
916  * anything, so candidates will not be eliminated on that basis.
917  *
918  * NB: okay to modify input list structure, as long as we find at least
919  * one match. If no match at all, the list must remain unmodified.
920  */
921 int
922 func_match_argtypes(int nargs,
923  Oid *input_typeids,
924  FuncCandidateList raw_candidates,
925  FuncCandidateList *candidates) /* return value */
926 {
927  FuncCandidateList current_candidate;
928  FuncCandidateList next_candidate;
929  int ncandidates = 0;
930 
931  *candidates = NULL;
932 
933  for (current_candidate = raw_candidates;
934  current_candidate != NULL;
935  current_candidate = next_candidate)
936  {
937  next_candidate = current_candidate->next;
938  if (can_coerce_type(nargs, input_typeids, current_candidate->args,
939  COERCION_IMPLICIT))
940  {
941  current_candidate->next = *candidates;
942  *candidates = current_candidate;
943  ncandidates++;
944  }
945  }
946 
947  return ncandidates;
948 } /* func_match_argtypes() */
949 
950 
951 /* func_select_candidate()
952  * Given the input argtype array and more than one candidate
953  * for the function, attempt to resolve the conflict.
954  *
955  * Returns the selected candidate if the conflict can be resolved,
956  * otherwise returns NULL.
957  *
958  * Note that the caller has already determined that there is no candidate
959  * exactly matching the input argtypes, and has pruned away any "candidates"
960  * that aren't actually coercion-compatible with the input types.
961  *
962  * This is also used for resolving ambiguous operator references. Formerly
963  * parse_oper.c had its own, essentially duplicate code for the purpose.
964  * The following comments (formerly in parse_oper.c) are kept to record some
965  * of the history of these heuristics.
966  *
967  * OLD COMMENTS:
968  *
969  * This routine is new code, replacing binary_oper_select_candidate()
970  * which dates from v4.2/v1.0.x days. It tries very hard to match up
971  * operators with types, including allowing type coercions if necessary.
972  * The important thing is that the code do as much as possible,
973  * while _never_ doing the wrong thing, where "the wrong thing" would
974  * be returning an operator when other better choices are available,
975  * or returning an operator which is a non-intuitive possibility.
976  * - thomas 1998-05-21
977  *
978  * The comments below came from binary_oper_select_candidate(), and
979  * illustrate the issues and choices which are possible:
980  * - thomas 1998-05-20
981  *
982  * current wisdom holds that the default operator should be one in which
983  * both operands have the same type (there will only be one such
984  * operator)
985  *
986  * 7.27.93 - I have decided not to do this; it's too hard to justify, and
987  * it's easy enough to typecast explicitly - avi
988  * [the rest of this routine was commented out since then - ay]
989  *
990  * 6/23/95 - I don't complete agree with avi. In particular, casting
991  * floats is a pain for users. Whatever the rationale behind not doing
992  * this is, I need the following special case to work.
993  *
994  * In the WHERE clause of a query, if a float is specified without
995  * quotes, we treat it as float8. I added the float48* operators so
996  * that we can operate on float4 and float8. But now we have more than
997  * one matching operator if the right arg is unknown (eg. float
998  * specified with quotes). This break some stuff in the regression
999  * test where there are floats in quotes not properly casted. Below is
1000  * the solution. In addition to requiring the operator operates on the
1001  * same type for both operands [as in the code Avi originally
1002  * commented out], we also require that the operators be equivalent in
1003  * some sense. (see equivalentOpersAfterPromotion for details.)
1004  * - ay 6/95
1005  */
1006 FuncCandidateList
1007 func_select_candidate(int nargs,
1008  Oid *input_typeids,
1009  FuncCandidateList candidates)
1010 {
1011  FuncCandidateList current_candidate,
1012  first_candidate,
1013  last_candidate;
1014  Oid *current_typeids;
1015  Oid current_type;
1016  int i;
1017  int ncandidates;
1018  int nbestMatch,
1019  nmatch,
1020  nunknowns;
1021  Oid input_base_typeids[FUNC_MAX_ARGS];
1022  TYPCATEGORY slot_category[FUNC_MAX_ARGS],
1023  current_category;
1024  bool current_is_preferred;
1025  bool slot_has_preferred_type[FUNC_MAX_ARGS];
1026  bool resolved_unknowns;
1027 
1028  /* protect local fixed-size arrays */
1029  if (nargs > FUNC_MAX_ARGS)
1030  ereport(ERROR,
1031  (errcode(ERRCODE_TOO_MANY_ARGUMENTS),
1032  errmsg_plural("cannot pass more than %d argument to a function",
1033  "cannot pass more than %d arguments to a function",
1034  FUNC_MAX_ARGS,
1035  FUNC_MAX_ARGS)));
1036 
1037  /*
1038  * If any input types are domains, reduce them to their base types. This
1039  * ensures that we will consider functions on the base type to be "exact
1040  * matches" in the exact-match heuristic; it also makes it possible to do
1041  * something useful with the type-category heuristics. Note that this
1042  * makes it difficult, but not impossible, to use functions declared to
1043  * take a domain as an input datatype. Such a function will be selected
1044  * over the base-type function only if it is an exact match at all
1045  * argument positions, and so was already chosen by our caller.
1046  *
1047  * While we're at it, count the number of unknown-type arguments for use
1048  * later.
1049  */
1050  nunknowns = 0;
1051  for (i = 0; i < nargs; i++)
1052  {
1053  if (input_typeids[i] != UNKNOWNOID)
1054  input_base_typeids[i] = getBaseType(input_typeids[i]);
1055  else
1056  {
1057  /* no need to call getBaseType on UNKNOWNOID */
1058  input_base_typeids[i] = UNKNOWNOID;
1059  nunknowns++;
1060  }
1061  }
1062 
1063  /*
1064  * Run through all candidates and keep those with the most matches on
1065  * exact types. Keep all candidates if none match.
1066  */
1067  ncandidates = 0;
1068  nbestMatch = 0;
1069  last_candidate = NULL;
1070  for (current_candidate = candidates;
1071  current_candidate != NULL;
1072  current_candidate = current_candidate->next)
1073  {
1074  current_typeids = current_candidate->args;
1075  nmatch = 0;
1076  for (i = 0; i < nargs; i++)
1077  {
1078  if (input_base_typeids[i] != UNKNOWNOID &&
1079  current_typeids[i] == input_base_typeids[i])
1080  nmatch++;
1081  }
1082 
1083  /* take this one as the best choice so far? */
1084  if ((nmatch > nbestMatch) || (last_candidate == NULL))
1085  {
1086  nbestMatch = nmatch;
1087  candidates = current_candidate;
1088  last_candidate = current_candidate;
1089  ncandidates = 1;
1090  }
1091  /* no worse than the last choice, so keep this one too? */
1092  else if (nmatch == nbestMatch)
1093  {
1094  last_candidate->next = current_candidate;
1095  last_candidate = current_candidate;
1096  ncandidates++;
1097  }
1098  /* otherwise, don't bother keeping this one... */
1099  }
1100 
1101  if (last_candidate) /* terminate rebuilt list */
1102  last_candidate->next = NULL;
1103 
1104  if (ncandidates == 1)
1105  return candidates;
1106 
1107  /*
1108  * Still too many candidates? Now look for candidates which have either
1109  * exact matches or preferred types at the args that will require
1110  * coercion. (Restriction added in 7.4: preferred type must be of same
1111  * category as input type; give no preference to cross-category
1112  * conversions to preferred types.) Keep all candidates if none match.
1113  */
1114  for (i = 0; i < nargs; i++) /* avoid multiple lookups */
1115  slot_category[i] = TypeCategory(input_base_typeids[i]);
1116  ncandidates = 0;
1117  nbestMatch = 0;
1118  last_candidate = NULL;
1119  for (current_candidate = candidates;
1120  current_candidate != NULL;
1121  current_candidate = current_candidate->next)
1122  {
1123  current_typeids = current_candidate->args;
1124  nmatch = 0;
1125  for (i = 0; i < nargs; i++)
1126  {
1127  if (input_base_typeids[i] != UNKNOWNOID)
1128  {
1129  if (current_typeids[i] == input_base_typeids[i] ||
1130  IsPreferredType(slot_category[i], current_typeids[i]))
1131  nmatch++;
1132  }
1133  }
1134 
1135  if ((nmatch > nbestMatch) || (last_candidate == NULL))
1136  {
1137  nbestMatch = nmatch;
1138  candidates = current_candidate;
1139  last_candidate = current_candidate;
1140  ncandidates = 1;
1141  }
1142  else if (nmatch == nbestMatch)
1143  {
1144  last_candidate->next = current_candidate;
1145  last_candidate = current_candidate;
1146  ncandidates++;
1147  }
1148  }
1149 
1150  if (last_candidate) /* terminate rebuilt list */
1151  last_candidate->next = NULL;
1152 
1153  if (ncandidates == 1)
1154  return candidates;
1155 
1156  /*
1157  * Still too many candidates? Try assigning types for the unknown inputs.
1158  *
1159  * If there are no unknown inputs, we have no more heuristics that apply,
1160  * and must fail.
1161  */
1162  if (nunknowns == 0)
1163  return NULL; /* failed to select a best candidate */
1164 
1165  /*
1166  * The next step examines each unknown argument position to see if we can
1167  * determine a "type category" for it. If any candidate has an input
1168  * datatype of STRING category, use STRING category (this bias towards
1169  * STRING is appropriate since unknown-type literals look like strings).
1170  * Otherwise, if all the candidates agree on the type category of this
1171  * argument position, use that category. Otherwise, fail because we
1172  * cannot determine a category.
1173  *
1174  * If we are able to determine a type category, also notice whether any of
1175  * the candidates takes a preferred datatype within the category.
1176  *
1177  * Having completed this examination, remove candidates that accept the
1178  * wrong category at any unknown position. Also, if at least one
1179  * candidate accepted a preferred type at a position, remove candidates
1180  * that accept non-preferred types. If just one candidate remains, return
1181  * that one. However, if this rule turns out to reject all candidates,
1182  * keep them all instead.
1183  */
1184  resolved_unknowns = false;
1185  for (i = 0; i < nargs; i++)
1186  {
1187  bool have_conflict;
1188 
1189  if (input_base_typeids[i] != UNKNOWNOID)
1190  continue;
1191  resolved_unknowns = true; /* assume we can do it */
1192  slot_category[i] = TYPCATEGORY_INVALID;
1193  slot_has_preferred_type[i] = false;
1194  have_conflict = false;
1195  for (current_candidate = candidates;
1196  current_candidate != NULL;
1197  current_candidate = current_candidate->next)
1198  {
1199  current_typeids = current_candidate->args;
1200  current_type = current_typeids[i];
1201  get_type_category_preferred(current_type,
1202  &current_category,
1203  &current_is_preferred);
1204  if (slot_category[i] == TYPCATEGORY_INVALID)
1205  {
1206  /* first candidate */
1207  slot_category[i] = current_category;
1208  slot_has_preferred_type[i] = current_is_preferred;
1209  }
1210  else if (current_category == slot_category[i])
1211  {
1212  /* more candidates in same category */
1213  slot_has_preferred_type[i] |= current_is_preferred;
1214  }
1215  else
1216  {
1217  /* category conflict! */
1218  if (current_category == TYPCATEGORY_STRING)
1219  {
1220  /* STRING always wins if available */
1221  slot_category[i] = current_category;
1222  slot_has_preferred_type[i] = current_is_preferred;
1223  }
1224  else
1225  {
1226  /*
1227  * Remember conflict, but keep going (might find STRING)
1228  */
1229  have_conflict = true;
1230  }
1231  }
1232  }
1233  if (have_conflict && slot_category[i] != TYPCATEGORY_STRING)
1234  {
1235  /* Failed to resolve category conflict at this position */
1236  resolved_unknowns = false;
1237  break;
1238  }
1239  }
1240 
1241  if (resolved_unknowns)
1242  {
1243  /* Strip non-matching candidates */
1244  ncandidates = 0;
1245  first_candidate = candidates;
1246  last_candidate = NULL;
1247  for (current_candidate = candidates;
1248  current_candidate != NULL;
1249  current_candidate = current_candidate->next)
1250  {
1251  bool keepit = true;
1252 
1253  current_typeids = current_candidate->args;
1254  for (i = 0; i < nargs; i++)
1255  {
1256  if (input_base_typeids[i] != UNKNOWNOID)
1257  continue;
1258  current_type = current_typeids[i];
1259  get_type_category_preferred(current_type,
1260  &current_category,
1261  &current_is_preferred);
1262  if (current_category != slot_category[i])
1263  {
1264  keepit = false;
1265  break;
1266  }
1267  if (slot_has_preferred_type[i] && !current_is_preferred)
1268  {
1269  keepit = false;
1270  break;
1271  }
1272  }
1273  if (keepit)
1274  {
1275  /* keep this candidate */
1276  last_candidate = current_candidate;
1277  ncandidates++;
1278  }
1279  else
1280  {
1281  /* forget this candidate */
1282  if (last_candidate)
1283  last_candidate->next = current_candidate->next;
1284  else
1285  first_candidate = current_candidate->next;
1286  }
1287  }
1288 
1289  /* if we found any matches, restrict our attention to those */
1290  if (last_candidate)
1291  {
1292  candidates = first_candidate;
1293  /* terminate rebuilt list */
1294  last_candidate->next = NULL;
1295  }
1296 
1297  if (ncandidates == 1)
1298  return candidates;
1299  }
1300 
1301  /*
1302  * Last gasp: if there are both known- and unknown-type inputs, and all
1303  * the known types are the same, assume the unknown inputs are also that
1304  * type, and see if that gives us a unique match. If so, use that match.
1305  *
1306  * NOTE: for a binary operator with one unknown and one non-unknown input,
1307  * we already tried this heuristic in binary_oper_exact(). However, that
1308  * code only finds exact matches, whereas here we will handle matches that
1309  * involve coercion, polymorphic type resolution, etc.
1310  */
1311  if (nunknowns < nargs)
1312  {
1313  Oid known_type = UNKNOWNOID;
1314 
1315  for (i = 0; i < nargs; i++)
1316  {
1317  if (input_base_typeids[i] == UNKNOWNOID)
1318  continue;
1319  if (known_type == UNKNOWNOID) /* first known arg? */
1320  known_type = input_base_typeids[i];
1321  else if (known_type != input_base_typeids[i])
1322  {
1323  /* oops, not all match */
1324  known_type = UNKNOWNOID;
1325  break;
1326  }
1327  }
1328 
1329  if (known_type != UNKNOWNOID)
1330  {
1331  /* okay, just one known type, apply the heuristic */
1332  for (i = 0; i < nargs; i++)
1333  input_base_typeids[i] = known_type;
1334  ncandidates = 0;
1335  last_candidate = NULL;
1336  for (current_candidate = candidates;
1337  current_candidate != NULL;
1338  current_candidate = current_candidate->next)
1339  {
1340  current_typeids = current_candidate->args;
1341  if (can_coerce_type(nargs, input_base_typeids, current_typeids,
1342  COERCION_IMPLICIT))
1343  {
1344  if (++ncandidates > 1)
1345  break; /* not unique, give up */
1346  last_candidate = current_candidate;
1347  }
1348  }
1349  if (ncandidates == 1)
1350  {
1351  /* successfully identified a unique match */
1352  last_candidate->next = NULL;
1353  return last_candidate;
1354  }
1355  }
1356  }
1357 
1358  return NULL; /* failed to select a best candidate */
1359 } /* func_select_candidate() */
1360 
1361 
1362 /* func_get_detail()
1363  *
1364  * Find the named function in the system catalogs.
1365  *
1366  * Attempt to find the named function in the system catalogs with
1367  * arguments exactly as specified, so that the normal case (exact match)
1368  * is as quick as possible.
1369  *
1370  * If an exact match isn't found:
1371  * 1) check for possible interpretation as a type coercion request
1372  * 2) apply the ambiguous-function resolution rules
1373  *
1374  * Return values *funcid through *true_typeids receive info about the function.
1375  * If argdefaults isn't NULL, *argdefaults receives a list of any default
1376  * argument expressions that need to be added to the given arguments.
1377  *
1378  * When processing a named- or mixed-notation call (ie, fargnames isn't NIL),
1379  * the returned true_typeids and argdefaults are ordered according to the
1380  * call's argument ordering: first any positional arguments, then the named
1381  * arguments, then defaulted arguments (if needed and allowed by
1382  * expand_defaults). Some care is needed if this information is to be compared
1383  * to the function's pg_proc entry, but in practice the caller can usually
1384  * just work with the call's argument ordering.
1385  *
1386  * We rely primarily on fargnames/nargs/argtypes as the argument description.
1387  * The actual expression node list is passed in fargs so that we can check
1388  * for type coercion of a constant. Some callers pass fargs == NIL indicating
1389  * they don't need that check made. Note also that when fargnames isn't NIL,
1390  * the fargs list must be passed if the caller wants actual argument position
1391  * information to be returned into the NamedArgExpr nodes.
1392  */
1393 FuncDetailCode
1394 func_get_detail(List *funcname,
1395  List *fargs,
1396  List *fargnames,
1397  int nargs,
1398  Oid *argtypes,
1399  bool expand_variadic,
1400  bool expand_defaults,
1401  bool include_out_arguments,
1402  Oid *funcid, /* return value */
1403  Oid *rettype, /* return value */
1404  bool *retset, /* return value */
1405  int *nvargs, /* return value */
1406  Oid *vatype, /* return value */
1407  Oid **true_typeids, /* return value */
1408  List **argdefaults) /* optional return value */
1409 {
1410  FuncCandidateList raw_candidates;
1411  FuncCandidateList best_candidate;
1412 
1413  /* initialize output arguments to silence compiler warnings */
1414  *funcid = InvalidOid;
1415  *rettype = InvalidOid;
1416  *retset = false;
1417  *nvargs = 0;
1418  *vatype = InvalidOid;
1419  *true_typeids = NULL;
1420  if (argdefaults)
1421  *argdefaults = NIL;
1422 
1423  /* Get list of possible candidates from namespace search */
1424  raw_candidates = FuncnameGetCandidates(funcname, nargs, fargnames,
1425  expand_variadic, expand_defaults,
1426  include_out_arguments, false);
1427 
1428  /*
1429  * Quickly check if there is an exact match to the input datatypes (there
1430  * can be only one)
1431  */
1432  for (best_candidate = raw_candidates;
1433  best_candidate != NULL;
1434  best_candidate = best_candidate->next)
1435  {
1436  /* if nargs==0, argtypes can be null; don't pass that to memcmp */
1437  if (nargs == 0 ||
1438  memcmp(argtypes, best_candidate->args, nargs * sizeof(Oid)) == 0)
1439  break;
1440  }
1441 
1442  if (best_candidate == NULL)
1443  {
1444  /*
1445  * If we didn't find an exact match, next consider the possibility
1446  * that this is really a type-coercion request: a single-argument
1447  * function call where the function name is a type name. If so, and
1448  * if the coercion path is RELABELTYPE or COERCEVIAIO, then go ahead
1449  * and treat the "function call" as a coercion.
1450  *
1451  * This interpretation needs to be given higher priority than
1452  * interpretations involving a type coercion followed by a function
1453  * call, otherwise we can produce surprising results. For example, we
1454  * want "text(varchar)" to be interpreted as a simple coercion, not as
1455  * "text(name(varchar))" which the code below this point is entirely
1456  * capable of selecting.
1457  *
1458  * We also treat a coercion of a previously-unknown-type literal
1459  * constant to a specific type this way.
1460  *
1461  * The reason we reject COERCION_PATH_FUNC here is that we expect the
1462  * cast implementation function to be named after the target type.
1463  * Thus the function will be found by normal lookup if appropriate.
1464  *
1465  * The reason we reject COERCION_PATH_ARRAYCOERCE is mainly that you
1466  * can't write "foo[] (something)" as a function call. In theory
1467  * someone might want to invoke it as "_foo (something)" but we have
1468  * never supported that historically, so we can insist that people
1469  * write it as a normal cast instead.
1470  *
1471  * We also reject the specific case of COERCEVIAIO for a composite
1472  * source type and a string-category target type. This is a case that
1473  * find_coercion_pathway() allows by default, but experience has shown
1474  * that it's too commonly invoked by mistake. So, again, insist that
1475  * people use cast syntax if they want to do that.
1476  *
1477  * NB: it's important that this code does not exceed what coerce_type
1478  * can do, because the caller will try to apply coerce_type if we
1479  * return FUNCDETAIL_COERCION. If we return that result for something
1480  * coerce_type can't handle, we'll cause infinite recursion between
1481  * this module and coerce_type!
1482  */
1483  if (nargs == 1 && fargs != NIL && fargnames == NIL)
1484  {
1485  Oid targetType = FuncNameAsType(funcname);
1486 
1487  if (OidIsValid(targetType))
1488  {
1489  Oid sourceType = argtypes[0];
1490  Node *arg1 = linitial(fargs);
1491  bool iscoercion;
1492 
1493  if (sourceType == UNKNOWNOID && IsA(arg1, Const))
1494  {
1495  /* always treat typename('literal') as coercion */
1496  iscoercion = true;
1497  }
1498  else
1499  {
1500  CoercionPathType cpathtype;
1501  Oid cfuncid;
1502 
1503  cpathtype = find_coercion_pathway(targetType, sourceType,
1504  COERCION_EXPLICIT,
1505  &cfuncid);
1506  switch (cpathtype)
1507  {
1508  case COERCION_PATH_RELABELTYPE:
1509  iscoercion = true;
1510  break;
1511  case COERCION_PATH_COERCEVIAIO:
1512  if ((sourceType == RECORDOID ||
1513  ISCOMPLEX(sourceType)) &&
1514  TypeCategory(targetType) == TYPCATEGORY_STRING)
1515  iscoercion = false;
1516  else
1517  iscoercion = true;
1518  break;
1519  default:
1520  iscoercion = false;
1521  break;
1522  }
1523  }
1524 
1525  if (iscoercion)
1526  {
1527  /* Treat it as a type coercion */
1528  *funcid = InvalidOid;
1529  *rettype = targetType;
1530  *retset = false;
1531  *nvargs = 0;
1532  *vatype = InvalidOid;
1533  *true_typeids = argtypes;
1534  return FUNCDETAIL_COERCION;
1535  }
1536  }
1537  }
1538 
1539  /*
1540  * didn't find an exact match, so now try to match up candidates...
1541  */
1542  if (raw_candidates != NULL)
1543  {
1544  FuncCandidateList current_candidates;
1545  int ncandidates;
1546 
1547  ncandidates = func_match_argtypes(nargs,
1548  argtypes,
1549  raw_candidates,
1550  &current_candidates);
1551 
1552  /* one match only? then run with it... */
1553  if (ncandidates == 1)
1554  best_candidate = current_candidates;
1555 
1556  /*
1557  * multiple candidates? then better decide or throw an error...
1558  */
1559  else if (ncandidates > 1)
1560  {
1561  best_candidate = func_select_candidate(nargs,
1562  argtypes,
1563  current_candidates);
1564 
1565  /*
1566  * If we were able to choose a best candidate, we're done.
1567  * Otherwise, ambiguous function call.
1568  */
1569  if (!best_candidate)
1570  return FUNCDETAIL_MULTIPLE;
1571  }
1572  }
1573  }
1574 
1575  if (best_candidate)
1576  {
1577  HeapTuple ftup;
1578  Form_pg_proc pform;
1579  FuncDetailCode result;
1580 
1581  /*
1582  * If processing named args or expanding variadics or defaults, the
1583  * "best candidate" might represent multiple equivalently good
1584  * functions; treat this case as ambiguous.
1585  */
1586  if (!OidIsValid(best_candidate->oid))
1587  return FUNCDETAIL_MULTIPLE;
1588 
1589  /*
1590  * We disallow VARIADIC with named arguments unless the last argument
1591  * (the one with VARIADIC attached) actually matched the variadic
1592  * parameter. This is mere pedantry, really, but some folks insisted.
1593  */
1594  if (fargnames != NIL && !expand_variadic && nargs > 0 &&
1595  best_candidate->argnumbers[nargs - 1] != nargs - 1)
1596  return FUNCDETAIL_NOTFOUND;
1597 
1598  *funcid = best_candidate->oid;
1599  *nvargs = best_candidate->nvargs;
1600  *true_typeids = best_candidate->args;
1601 
1602  /*
1603  * If processing named args, return actual argument positions into
1604  * NamedArgExpr nodes in the fargs list. This is a bit ugly but not
1605  * worth the extra notation needed to do it differently.
1606  */
1607  if (best_candidate->argnumbers != NULL)
1608  {
1609  int i = 0;
1610  ListCell *lc;
1611 
1612  foreach(lc, fargs)
1613  {
1614  NamedArgExpr *na = (NamedArgExpr *) lfirst(lc);
1615 
1616  if (IsA(na, NamedArgExpr))
1617  na->argnumber = best_candidate->argnumbers[i];
1618  i++;
1619  }
1620  }
1621 
1622  ftup = SearchSysCache1(PROCOID,
1623  ObjectIdGetDatum(best_candidate->oid));
1624  if (!HeapTupleIsValid(ftup)) /* should not happen */
1625  elog(ERROR, "cache lookup failed for function %u",
1626  best_candidate->oid);
1627  pform = (Form_pg_proc) GETSTRUCT(ftup);
1628  *rettype = pform->prorettype;
1629  *retset = pform->proretset;
1630  *vatype = pform->provariadic;
1631  /* fetch default args if caller wants 'em */
1632  if (argdefaults && best_candidate->ndargs > 0)
1633  {
1634  Datum proargdefaults;
1635  char *str;
1636  List *defaults;
1637 
1638  /* shouldn't happen, FuncnameGetCandidates messed up */
1639  if (best_candidate->ndargs > pform->pronargdefaults)
1640  elog(ERROR, "not enough default arguments");
1641 
1642  proargdefaults = SysCacheGetAttrNotNull(PROCOID, ftup,
1643  Anum_pg_proc_proargdefaults);
1644  str = TextDatumGetCString(proargdefaults);
1645  defaults = castNode(List, stringToNode(str));
1646  pfree(str);
1647 
1648  /* Delete any unused defaults from the returned list */
1649  if (best_candidate->argnumbers != NULL)
1650  {
1651  /*
1652  * This is a bit tricky in named notation, since the supplied
1653  * arguments could replace any subset of the defaults. We
1654  * work by making a bitmapset of the argnumbers of defaulted
1655  * arguments, then scanning the defaults list and selecting
1656  * the needed items. (This assumes that defaulted arguments
1657  * should be supplied in their positional order.)
1658  */
1659  Bitmapset *defargnumbers;
1660  int *firstdefarg;
1661  List *newdefaults;
1662  ListCell *lc;
1663  int i;
1664 
1665  defargnumbers = NULL;
1666  firstdefarg = &best_candidate->argnumbers[best_candidate->nargs - best_candidate->ndargs];
1667  for (i = 0; i < best_candidate->ndargs; i++)
1668  defargnumbers = bms_add_member(defargnumbers,
1669  firstdefarg[i]);
1670  newdefaults = NIL;
1671  i = best_candidate->nominalnargs - pform->pronargdefaults;
1672  foreach(lc, defaults)
1673  {
1674  if (bms_is_member(i, defargnumbers))
1675  newdefaults = lappend(newdefaults, lfirst(lc));
1676  i++;
1677  }
1678  Assert(list_length(newdefaults) == best_candidate->ndargs);
1679  bms_free(defargnumbers);
1680  *argdefaults = newdefaults;
1681  }
1682  else
1683  {
1684  /*
1685  * Defaults for positional notation are lots easier; just
1686  * remove any unwanted ones from the front.
1687  */
1688  int ndelete;
1689 
1690  ndelete = list_length(defaults) - best_candidate->ndargs;
1691  if (ndelete > 0)
1692  defaults = list_delete_first_n(defaults, ndelete);
1693  *argdefaults = defaults;
1694  }
1695  }
1696 
1697  switch (pform->prokind)
1698  {
1699  case PROKIND_AGGREGATE:
1700  result = FUNCDETAIL_AGGREGATE;
1701  break;
1702  case PROKIND_FUNCTION:
1703  result = FUNCDETAIL_NORMAL;
1704  break;
1705  case PROKIND_PROCEDURE:
1706  result = FUNCDETAIL_PROCEDURE;
1707  break;
1708  case PROKIND_WINDOW:
1709  result = FUNCDETAIL_WINDOWFUNC;
1710  break;
1711  default:
1712  elog(ERROR, "unrecognized prokind: %c", pform->prokind);
1713  result = FUNCDETAIL_NORMAL; /* keep compiler quiet */
1714  break;
1715  }
1716 
1717  ReleaseSysCache(ftup);
1718  return result;
1719  }
1720 
1721  return FUNCDETAIL_NOTFOUND;
1722 }
1723 
1724 
1725 /*
1726  * unify_hypothetical_args()
1727  *
1728  * Ensure that each hypothetical direct argument of a hypothetical-set
1729  * aggregate has the same type as the corresponding aggregated argument.
1730  * Modify the expressions in the fargs list, if necessary, and update
1731  * actual_arg_types[].
1732  *
1733  * If the agg declared its args non-ANY (even ANYELEMENT), we need only a
1734  * sanity check that the declared types match; make_fn_arguments will coerce
1735  * the actual arguments to match the declared ones. But if the declaration
1736  * is ANY, nothing will happen in make_fn_arguments, so we need to fix any
1737  * mismatch here. We use the same type resolution logic as UNION etc.
1738  */
1739 static void
1740 unify_hypothetical_args(ParseState *pstate,
1741  List *fargs,
1742  int numAggregatedArgs,
1743  Oid *actual_arg_types,
1744  Oid *declared_arg_types)
1745 {
1746  int numDirectArgs,
1747  numNonHypotheticalArgs;
1748  int hargpos;
1749 
1750  numDirectArgs = list_length(fargs) - numAggregatedArgs;
1751  numNonHypotheticalArgs = numDirectArgs - numAggregatedArgs;
1752  /* safety check (should only trigger with a misdeclared agg) */
1753  if (numNonHypotheticalArgs < 0)
1754  elog(ERROR, "incorrect number of arguments to hypothetical-set aggregate");
1755 
1756  /* Check each hypothetical arg and corresponding aggregated arg */
1757  for (hargpos = numNonHypotheticalArgs; hargpos < numDirectArgs; hargpos++)
1758  {
1759  int aargpos = numDirectArgs + (hargpos - numNonHypotheticalArgs);
1760  ListCell *harg = list_nth_cell(fargs, hargpos);
1761  ListCell *aarg = list_nth_cell(fargs, aargpos);
1762  Oid commontype;
1763  int32 commontypmod;
1764 
1765  /* A mismatch means AggregateCreate didn't check properly ... */
1766  if (declared_arg_types[hargpos] != declared_arg_types[aargpos])
1767  elog(ERROR, "hypothetical-set aggregate has inconsistent declared argument types");
1768 
1769  /* No need to unify if make_fn_arguments will coerce */
1770  if (declared_arg_types[hargpos] != ANYOID)
1771  continue;
1772 
1773  /*
1774  * Select common type, giving preference to the aggregated argument's
1775  * type (we'd rather coerce the direct argument once than coerce all
1776  * the aggregated values).
1777  */
1778  commontype = select_common_type(pstate,
1779  list_make2(lfirst(aarg), lfirst(harg)),
1780  "WITHIN GROUP",
1781  NULL);
1782  commontypmod = select_common_typmod(pstate,
1783  list_make2(lfirst(aarg), lfirst(harg)),
1784  commontype);
1785 
1786  /*
1787  * Perform the coercions. We don't need to worry about NamedArgExprs
1788  * here because they aren't supported with aggregates.
1789  */
1790  lfirst(harg) = coerce_type(pstate,
1791  (Node *) lfirst(harg),
1792  actual_arg_types[hargpos],
1793  commontype, commontypmod,
1794  COERCION_IMPLICIT,
1795  COERCE_IMPLICIT_CAST,
1796  -1);
1797  actual_arg_types[hargpos] = commontype;
1798  lfirst(aarg) = coerce_type(pstate,
1799  (Node *) lfirst(aarg),
1800  actual_arg_types[aargpos],
1801  commontype, commontypmod,
1802  COERCION_IMPLICIT,
1803  COERCE_IMPLICIT_CAST,
1804  -1);
1805  actual_arg_types[aargpos] = commontype;
1806  }
1807 }
1808 
1809 
1810 /*
1811  * make_fn_arguments()
1812  *
1813  * Given the actual argument expressions for a function, and the desired
1814  * input types for the function, add any necessary typecasting to the
1815  * expression tree. Caller should already have verified that casting is
1816  * allowed.
1817  *
1818  * Caution: given argument list is modified in-place.
1819  *
1820  * As with coerce_type, pstate may be NULL if no special unknown-Param
1821  * processing is wanted.
1822  */
1823 void
1824 make_fn_arguments(ParseState *pstate,
1825  List *fargs,
1826  Oid *actual_arg_types,
1827  Oid *declared_arg_types)
1828 {
1829  ListCell *current_fargs;
1830  int i = 0;
1831 
1832  foreach(current_fargs, fargs)
1833  {
1834  /* types don't match? then force coercion using a function call... */
1835  if (actual_arg_types[i] != declared_arg_types[i])
1836  {
1837  Node *node = (Node *) lfirst(current_fargs);
1838 
1839  /*
1840  * If arg is a NamedArgExpr, coerce its input expr instead --- we
1841  * want the NamedArgExpr to stay at the top level of the list.
1842  */
1843  if (IsA(node, NamedArgExpr))
1844  {
1845  NamedArgExpr *na = (NamedArgExpr *) node;
1846 
1847  node = coerce_type(pstate,
1848  (Node *) na->arg,
1849  actual_arg_types[i],
1850  declared_arg_types[i], -1,
1851  COERCION_IMPLICIT,
1852  COERCE_IMPLICIT_CAST,
1853  -1);
1854  na->arg = (Expr *) node;
1855  }
1856  else
1857  {
1858  node = coerce_type(pstate,
1859  node,
1860  actual_arg_types[i],
1861  declared_arg_types[i], -1,
1862  COERCION_IMPLICIT,
1863  COERCE_IMPLICIT_CAST,
1864  -1);
1865  lfirst(current_fargs) = node;
1866  }
1867  }
1868  i++;
1869  }
1870 }
1871 
1872 /*
1873  * FuncNameAsType -
1874  * convenience routine to see if a function name matches a type name
1875  *
1876  * Returns the OID of the matching type, or InvalidOid if none. We ignore
1877  * shell types and complex types.
1878  */
1879 static Oid
1880 FuncNameAsType(List *funcname)
1881 {
1882  Oid result;
1883  Type typtup;
1884 
1885  /*
1886  * temp_ok=false protects the <refsect1 id="sql-createfunction-security">
1887  * contract for writing SECURITY DEFINER functions safely.
1888  */
1889  typtup = LookupTypeNameExtended(NULL, makeTypeNameFromNameList(funcname),
1890  NULL, false, false);
1891  if (typtup == NULL)
1892  return InvalidOid;
1893 
1894  if (((Form_pg_type) GETSTRUCT(typtup))->typisdefined &&
1895  !OidIsValid(typeTypeRelid(typtup)))
1896  result = typeTypeId(typtup);
1897  else
1898  result = InvalidOid;
1899 
1900  ReleaseSysCache(typtup);
1901  return result;
1902 }
1903 
1904 /*
1905  * ParseComplexProjection -
1906  * handles function calls with a single argument that is of complex type.
1907  * If the function call is actually a column projection, return a suitably
1908  * transformed expression tree. If not, return NULL.
1909  */
1910 static Node *
1911 ParseComplexProjection(ParseState *pstate, const char *funcname, Node *first_arg,
1912  int location)
1913 {
1914  TupleDesc tupdesc;
1915  int i;
1916 
1917  /*
1918  * Special case for whole-row Vars so that we can resolve (foo.*).bar even
1919  * when foo is a reference to a subselect, join, or RECORD function. A
1920  * bonus is that we avoid generating an unnecessary FieldSelect; our
1921  * result can omit the whole-row Var and just be a Var for the selected
1922  * field.
1923  *
1924  * This case could be handled by expandRecordVariable, but it's more
1925  * efficient to do it this way when possible.
1926  */
1927  if (IsA(first_arg, Var) &&
1928  ((Var *) first_arg)->varattno == InvalidAttrNumber)
1929  {
1930  ParseNamespaceItem *nsitem;
1931 
1932  nsitem = GetNSItemByRangeTablePosn(pstate,
1933  ((Var *) first_arg)->varno,
1934  ((Var *) first_arg)->varlevelsup);
1935  /* Return a Var if funcname matches a column, else NULL */
1936  return scanNSItemForColumn(pstate, nsitem,
1937  ((Var *) first_arg)->varlevelsup,
1938  funcname, location);
1939  }
1940 
1941  /*
1942  * Else do it the hard way with get_expr_result_tupdesc().
1943  *
1944  * If it's a Var of type RECORD, we have to work even harder: we have to
1945  * find what the Var refers to, and pass that to get_expr_result_tupdesc.
1946  * That task is handled by expandRecordVariable().
1947  */
1948  if (IsA(first_arg, Var) &&
1949  ((Var *) first_arg)->vartype == RECORDOID)
1950  tupdesc = expandRecordVariable(pstate, (Var *) first_arg, 0);
1951  else
1952  tupdesc = get_expr_result_tupdesc(first_arg, true);
1953  if (!tupdesc)
1954  return NULL; /* unresolvable RECORD type */
1955 
1956  for (i = 0; i < tupdesc->natts; i++)
1957  {
1958  Form_pg_attribute att = TupleDescAttr(tupdesc, i);
1959 
1960  if (strcmp(funcname, NameStr(att->attname)) == 0 &&
1961  !att->attisdropped)
1962  {
1963  /* Success, so generate a FieldSelect expression */
1964  FieldSelect *fselect = makeNode(FieldSelect);
1965 
1966  fselect->arg = (Expr *) first_arg;
1967  fselect->fieldnum = i + 1;
1968  fselect->resulttype = att->atttypid;
1969  fselect->resulttypmod = att->atttypmod;
1970  /* save attribute's collation for parse_collate.c */
1971  fselect->resultcollid = att->attcollation;
1972  return (Node *) fselect;
1973  }
1974  }
1975 
1976  return NULL; /* funcname does not match any column */
1977 }
1978 
1979 /*
1980  * funcname_signature_string
1981  * Build a string representing a function name, including arg types.
1982  * The result is something like "foo(integer)".
1983  *
1984  * If argnames isn't NIL, it is a list of C strings representing the actual
1985  * arg names for the last N arguments. This must be considered part of the
1986  * function signature too, when dealing with named-notation function calls.
1987  *
1988  * This is typically used in the construction of function-not-found error
1989  * messages.
1990  */
1991 const char *
1992 funcname_signature_string(const char *funcname, int nargs,
1993  List *argnames, const Oid *argtypes)
1994 {
1995  StringInfoData argbuf;
1996  int numposargs;
1997  ListCell *lc;
1998  int i;
1999 
2000  initStringInfo(&argbuf);
2001 
2002  appendStringInfo(&argbuf, "%s(", funcname);
2003 
2004  numposargs = nargs - list_length(argnames);
2005  lc = list_head(argnames);
2006 
2007  for (i = 0; i < nargs; i++)
2008  {
2009  if (i)
2010  appendStringInfoString(&argbuf, ", ");
2011  if (i >= numposargs)
2012  {
2013  appendStringInfo(&argbuf, "%s => ", (char *) lfirst(lc));
2014  lc = lnext(argnames, lc);
2015  }
2016  appendStringInfoString(&argbuf, format_type_be(argtypes[i]));
2017  }
2018 
2019  appendStringInfoChar(&argbuf, ')');
2020 
2021  return argbuf.data; /* return palloc'd string buffer */
2022 }
2023 
2024 /*
2025  * func_signature_string
2026  * As above, but function name is passed as a qualified name list.
2027  */
2028 const char *
2029 func_signature_string(List *funcname, int nargs,
2030  List *argnames, const Oid *argtypes)
2031 {
2032  return funcname_signature_string(NameListToString(funcname),
2033  nargs, argnames, argtypes);
2034 }
2035 
2036 /*
2037  * LookupFuncNameInternal
2038  * Workhorse for LookupFuncName/LookupFuncWithArgs
2039  *
2040  * In an error situation, e.g. can't find the function, then we return
2041  * InvalidOid and set *lookupError to indicate what went wrong.
2042  *
2043  * Possible errors:
2044  * FUNCLOOKUP_NOSUCHFUNC: we can't find a function of this name.
2045  * FUNCLOOKUP_AMBIGUOUS: more than one function matches.
2046  */
2047 static Oid
2048 LookupFuncNameInternal(ObjectType objtype, List *funcname,
2049  int nargs, const Oid *argtypes,
2050  bool include_out_arguments, bool missing_ok,
2051  FuncLookupError *lookupError)
2052 {
2053  Oid result = InvalidOid;
2054  FuncCandidateList clist;
2055 
2056  /* NULL argtypes allowed for nullary functions only */
2057  Assert(argtypes != NULL || nargs == 0);
2058 
2059  /* Always set *lookupError, to forestall uninitialized-variable warnings */
2060  *lookupError = FUNCLOOKUP_NOSUCHFUNC;
2061 
2062  /* Get list of candidate objects */
2063  clist = FuncnameGetCandidates(funcname, nargs, NIL, false, false,
2064  include_out_arguments, missing_ok);
2065 
2066  /* Scan list for a match to the arg types (if specified) and the objtype */
2067  for (; clist != NULL; clist = clist->next)
2068  {
2069  /* Check arg type match, if specified */
2070  if (nargs >= 0)
2071  {
2072  /* if nargs==0, argtypes can be null; don't pass that to memcmp */
2073  if (nargs > 0 &&
2074  memcmp(argtypes, clist->args, nargs * sizeof(Oid)) != 0)
2075  continue;
2076  }
2077 
2078  /* Check for duplicates reported by FuncnameGetCandidates */
2079  if (!OidIsValid(clist->oid))
2080  {
2081  *lookupError = FUNCLOOKUP_AMBIGUOUS;
2082  return InvalidOid;
2083  }
2084 
2085  /* Check objtype match, if specified */
2086  switch (objtype)
2087  {
2088  case OBJECT_FUNCTION:
2089  case OBJECT_AGGREGATE:
2090  /* Ignore procedures */
2091  if (get_func_prokind(clist->oid) == PROKIND_PROCEDURE)
2092  continue;
2093  break;
2094  case OBJECT_PROCEDURE:
2095  /* Ignore non-procedures */
2096  if (get_func_prokind(clist->oid) != PROKIND_PROCEDURE)
2097  continue;
2098  break;
2099  case OBJECT_ROUTINE:
2100  /* no restriction */
2101  break;
2102  default:
2103  Assert(false);
2104  }
2105 
2106  /* Check for multiple matches */
2107  if (OidIsValid(result))
2108  {
2109  *lookupError = FUNCLOOKUP_AMBIGUOUS;
2110  return InvalidOid;
2111  }
2112 
2113  /* OK, we have a candidate */
2114  result = clist->oid;
2115  }
2116 
2117  return result;
2118 }
2119 
2120 /*
2121  * LookupFuncName
2122  *
2123  * Given a possibly-qualified function name and optionally a set of argument
2124  * types, look up the function. Pass nargs == -1 to indicate that the number
2125  * and types of the arguments are unspecified (this is NOT the same as
2126  * specifying that there are no arguments).
2127  *
2128  * If the function name is not schema-qualified, it is sought in the current
2129  * namespace search path.
2130  *
2131  * If the function is not found, we return InvalidOid if missing_ok is true,
2132  * else raise an error.
2133  *
2134  * If nargs == -1 and multiple functions are found matching this function name
2135  * we will raise an ambiguous-function error, regardless of what missing_ok is
2136  * set to.
2137  *
2138  * Only functions will be found; procedures will be ignored even if they
2139  * match the name and argument types. (However, we don't trouble to reject
2140  * aggregates or window functions here.)
2141  */
2142 Oid
2143 LookupFuncName(List *funcname, int nargs, const Oid *argtypes, bool missing_ok)
2144 {
2145  Oid funcoid;
2146  FuncLookupError lookupError;
2147 
2148  funcoid = LookupFuncNameInternal(OBJECT_FUNCTION,
2149  funcname, nargs, argtypes,
2150  false, missing_ok,
2151  &lookupError);
2152 
2153  if (OidIsValid(funcoid))
2154  return funcoid;
2155 
2156  switch (lookupError)
2157  {
2158  case FUNCLOOKUP_NOSUCHFUNC:
2159  /* Let the caller deal with it when missing_ok is true */
2160  if (missing_ok)
2161  return InvalidOid;
2162 
2163  if (nargs < 0)
2164  ereport(ERROR,
2165  (errcode(ERRCODE_UNDEFINED_FUNCTION),
2166  errmsg("could not find a function named \"%s\"",
2167  NameListToString(funcname))));
2168  else
2169  ereport(ERROR,
2170  (errcode(ERRCODE_UNDEFINED_FUNCTION),
2171  errmsg("function %s does not exist",
2172  func_signature_string(funcname, nargs,
2173  NIL, argtypes))));
2174  break;
2175 
2176  case FUNCLOOKUP_AMBIGUOUS:
2177  /* Raise an error regardless of missing_ok */
2178  ereport(ERROR,
2179  (errcode(ERRCODE_AMBIGUOUS_FUNCTION),
2180  errmsg("function name \"%s\" is not unique",
2181  NameListToString(funcname)),
2182  errhint("Specify the argument list to select the function unambiguously.")));
2183  break;
2184  }
2185 
2186  return InvalidOid; /* Keep compiler quiet */
2187 }
2188 
2189 /*
2190  * LookupFuncWithArgs
2191  *
2192  * Like LookupFuncName, but the argument types are specified by an
2193  * ObjectWithArgs node. Also, this function can check whether the result is a
2194  * function, procedure, or aggregate, based on the objtype argument. Pass
2195  * OBJECT_ROUTINE to accept any of them.
2196  *
2197  * For historical reasons, we also accept aggregates when looking for a
2198  * function.
2199  *
2200  * When missing_ok is true we don't generate any error for missing objects and
2201  * return InvalidOid. Other types of errors can still be raised, regardless
2202  * of the value of missing_ok.
2203  */
2204 Oid
2205 LookupFuncWithArgs(ObjectType objtype, ObjectWithArgs *func, bool missing_ok)
2206 {
2207  Oid argoids[FUNC_MAX_ARGS];
2208  int argcount;
2209  int nargs;
2210  int i;
2211  ListCell *args_item;
2212  Oid oid;
2213  FuncLookupError lookupError;
2214 
2215  Assert(objtype == OBJECT_AGGREGATE ||
2216  objtype == OBJECT_FUNCTION ||
2217  objtype == OBJECT_PROCEDURE ||
2218  objtype == OBJECT_ROUTINE);
2219 
2220  argcount = list_length(func->objargs);
2221  if (argcount > FUNC_MAX_ARGS)
2222  {
2223  if (objtype == OBJECT_PROCEDURE)
2224  ereport(ERROR,
2225  (errcode(ERRCODE_TOO_MANY_ARGUMENTS),
2226  errmsg_plural("procedures cannot have more than %d argument",
2227  "procedures cannot have more than %d arguments",
2228  FUNC_MAX_ARGS,
2229  FUNC_MAX_ARGS)));
2230  else
2231  ereport(ERROR,
2232  (errcode(ERRCODE_TOO_MANY_ARGUMENTS),
2233  errmsg_plural("functions cannot have more than %d argument",
2234  "functions cannot have more than %d arguments",
2235  FUNC_MAX_ARGS,
2236  FUNC_MAX_ARGS)));
2237  }
2238 
2239  /*
2240  * First, perform a lookup considering only input arguments (traditional
2241  * Postgres rules).
2242  */
2243  i = 0;
2244  foreach(args_item, func->objargs)
2245  {
2246  TypeName *t = lfirst_node(TypeName, args_item);
2247 
2248  argoids[i] = LookupTypeNameOid(NULL, t, missing_ok);
2249  if (!OidIsValid(argoids[i]))
2250  return InvalidOid; /* missing_ok must be true */
2251  i++;
2252  }
2253 
2254  /*
2255  * Set nargs for LookupFuncNameInternal. It expects -1 to mean no args
2256  * were specified.
2257  */
2258  nargs = func->args_unspecified ? -1 : argcount;
2259 
2260  /*
2261  * In args_unspecified mode, also tell LookupFuncNameInternal to consider
2262  * the object type, since there seems no reason not to. However, if we
2263  * have an argument list, disable the objtype check, because we'd rather
2264  * complain about "object is of wrong type" than "object doesn't exist".
2265  * (Note that with args, FuncnameGetCandidates will have ensured there's
2266  * only one argtype match, so we're not risking an ambiguity failure via
2267  * this choice.)
2268  */
2269  oid = LookupFuncNameInternal(func->args_unspecified ? objtype : OBJECT_ROUTINE,
2270  func->objname, nargs, argoids,
2271  false, missing_ok,
2272  &lookupError);
2273 
2274  /*
2275  * If PROCEDURE or ROUTINE was specified, and we have an argument list
2276  * that contains no parameter mode markers, and we didn't already discover
2277  * that there's ambiguity, perform a lookup considering all arguments.
2278  * (Note: for a zero-argument procedure, or in args_unspecified mode, the
2279  * normal lookup is sufficient; so it's OK to require non-NIL objfuncargs
2280  * to perform this lookup.)
2281  */
2282  if ((objtype == OBJECT_PROCEDURE || objtype == OBJECT_ROUTINE) &&
2283  func->objfuncargs != NIL &&
2284  lookupError != FUNCLOOKUP_AMBIGUOUS)
2285  {
2286  bool have_param_mode = false;
2287 
2288  /*
2289  * Check for non-default parameter mode markers. If there are any,
2290  * then the command does not conform to SQL-spec syntax, so we may
2291  * assume that the traditional Postgres lookup method of considering
2292  * only input parameters is sufficient. (Note that because the spec
2293  * doesn't have OUT arguments for functions, we also don't need this
2294  * hack in FUNCTION or AGGREGATE mode.)
2295  */
2296  foreach(args_item, func->objfuncargs)
2297  {
2298  FunctionParameter *fp = lfirst_node(FunctionParameter, args_item);
2299 
2300  if (fp->mode != FUNC_PARAM_DEFAULT)
2301  {
2302  have_param_mode = true;
2303  break;
2304  }
2305  }
2306 
2307  if (!have_param_mode)
2308  {
2309  Oid poid;
2310 
2311  /* Without mode marks, objargs surely includes all params */
2312  Assert(list_length(func->objfuncargs) == argcount);
2313 
2314  /* For objtype == OBJECT_PROCEDURE, we can ignore non-procedures */
2315  poid = LookupFuncNameInternal(objtype, func->objname,
2316  argcount, argoids,
2317  true, missing_ok,
2318  &lookupError);
2319 
2320  /* Combine results, handling ambiguity */
2321  if (OidIsValid(poid))
2322  {
2323  if (OidIsValid(oid) && oid != poid)
2324  {
2325  /* oops, we got hits both ways, on different objects */
2326  oid = InvalidOid;
2327  lookupError = FUNCLOOKUP_AMBIGUOUS;
2328  }
2329  else
2330  oid = poid;
2331  }
2332  else if (lookupError == FUNCLOOKUP_AMBIGUOUS)
2333  oid = InvalidOid;
2334  }
2335  }
2336 
2337  if (OidIsValid(oid))
2338  {
2339  /*
2340  * Even if we found the function, perform validation that the objtype
2341  * matches the prokind of the found function. For historical reasons
2342  * we allow the objtype of FUNCTION to include aggregates and window
2343  * functions; but we draw the line if the object is a procedure. That
2344  * is a new enough feature that this historical rule does not apply.
2345  *
2346  * (This check is partially redundant with the objtype check in
2347  * LookupFuncNameInternal; but not entirely, since we often don't tell
2348  * LookupFuncNameInternal to apply that check at all.)
2349  */
2350  switch (objtype)
2351  {
2352  case OBJECT_FUNCTION:
2353  /* Only complain if it's a procedure. */
2354  if (get_func_prokind(oid) == PROKIND_PROCEDURE)
2355  ereport(ERROR,
2356  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2357  errmsg("%s is not a function",
2358  func_signature_string(func->objname, argcount,
2359  NIL, argoids))));
2360  break;
2361 
2362  case OBJECT_PROCEDURE:
2363  /* Reject if found object is not a procedure. */
2364  if (get_func_prokind(oid) != PROKIND_PROCEDURE)
2365  ereport(ERROR,
2366  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2367  errmsg("%s is not a procedure",
2368  func_signature_string(func->objname, argcount,
2369  NIL, argoids))));
2370  break;
2371 
2372  case OBJECT_AGGREGATE:
2373  /* Reject if found object is not an aggregate. */
2374  if (get_func_prokind(oid) != PROKIND_AGGREGATE)
2375  ereport(ERROR,
2376  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2377  errmsg("function %s is not an aggregate",
2378  func_signature_string(func->objname, argcount,
2379  NIL, argoids))));
2380  break;
2381 
2382  default:
2383  /* OBJECT_ROUTINE accepts anything. */
2384  break;
2385  }
2386 
2387  return oid; /* All good */
2388  }
2389  else
2390  {
2391  /* Deal with cases where the lookup failed */
2392  switch (lookupError)
2393  {
2394  case FUNCLOOKUP_NOSUCHFUNC:
2395  /* Suppress no-such-func errors when missing_ok is true */
2396  if (missing_ok)
2397  break;
2398 
2399  switch (objtype)
2400  {
2401  case OBJECT_PROCEDURE:
2402  if (func->args_unspecified)
2403  ereport(ERROR,
2404  (errcode(ERRCODE_UNDEFINED_FUNCTION),
2405  errmsg("could not find a procedure named \"%s\"",
2406  NameListToString(func->objname))));
2407  else
2408  ereport(ERROR,
2409  (errcode(ERRCODE_UNDEFINED_FUNCTION),
2410  errmsg("procedure %s does not exist",
2411  func_signature_string(func->objname, argcount,
2412  NIL, argoids))));
2413  break;
2414 
2415  case OBJECT_AGGREGATE:
2416  if (func->args_unspecified)
2417  ereport(ERROR,
2418  (errcode(ERRCODE_UNDEFINED_FUNCTION),
2419  errmsg("could not find an aggregate named \"%s\"",
2420  NameListToString(func->objname))));
2421  else if (argcount == 0)
2422  ereport(ERROR,
2423  (errcode(ERRCODE_UNDEFINED_FUNCTION),
2424  errmsg("aggregate %s(*) does not exist",
2425  NameListToString(func->objname))));
2426  else
2427  ereport(ERROR,
2428  (errcode(ERRCODE_UNDEFINED_FUNCTION),
2429  errmsg("aggregate %s does not exist",
2430  func_signature_string(func->objname, argcount,
2431  NIL, argoids))));
2432  break;
2433 
2434  default:
2435  /* FUNCTION and ROUTINE */
2436  if (func->args_unspecified)
2437  ereport(ERROR,
2438  (errcode(ERRCODE_UNDEFINED_FUNCTION),
2439  errmsg("could not find a function named \"%s\"",
2440  NameListToString(func->objname))));
2441  else
2442  ereport(ERROR,
2443  (errcode(ERRCODE_UNDEFINED_FUNCTION),
2444  errmsg("function %s does not exist",
2445  func_signature_string(func->objname, argcount,
2446  NIL, argoids))));
2447  break;
2448  }
2449  break;
2450 
2451  case FUNCLOOKUP_AMBIGUOUS:
2452  switch (objtype)
2453  {
2454  case OBJECT_FUNCTION:
2455  ereport(ERROR,
2456  (errcode(ERRCODE_AMBIGUOUS_FUNCTION),
2457  errmsg("function name \"%s\" is not unique",
2458  NameListToString(func->objname)),
2459  func->args_unspecified ?
2460  errhint("Specify the argument list to select the function unambiguously.") : 0));
2461  break;
2462  case OBJECT_PROCEDURE:
2463  ereport(ERROR,
2464  (errcode(ERRCODE_AMBIGUOUS_FUNCTION),
2465  errmsg("procedure name \"%s\" is not unique",
2466  NameListToString(func->objname)),
2467  func->args_unspecified ?
2468  errhint("Specify the argument list to select the procedure unambiguously.") : 0));
2469  break;
2470  case OBJECT_AGGREGATE:
2471  ereport(ERROR,
2472  (errcode(ERRCODE_AMBIGUOUS_FUNCTION),
2473  errmsg("aggregate name \"%s\" is not unique",
2474  NameListToString(func->objname)),
2475  func->args_unspecified ?
2476  errhint("Specify the argument list to select the aggregate unambiguously.") : 0));
2477  break;
2478  case OBJECT_ROUTINE:
2479  ereport(ERROR,
2480  (errcode(ERRCODE_AMBIGUOUS_FUNCTION),
2481  errmsg("routine name \"%s\" is not unique",
2482  NameListToString(func->objname)),
2483  func->args_unspecified ?
2484  errhint("Specify the argument list to select the routine unambiguously.") : 0));
2485  break;
2486 
2487  default:
2488  Assert(false); /* Disallowed by Assert above */
2489  break;
2490  }
2491  break;
2492  }
2493 
2494  return InvalidOid;
2495  }
2496 }
2497 
2498 /*
2499  * check_srf_call_placement
2500  * Verify that a set-returning function is called in a valid place,
2501  * and throw a nice error if not.
2502  *
2503  * A side-effect is to set pstate->p_hasTargetSRFs true if appropriate.
2504  *
2505  * last_srf should be a copy of pstate->p_last_srf from just before we
2506  * started transforming the function's arguments. This allows detection
2507  * of whether the SRF's arguments contain any SRFs.
2508  */
2509 void
2510 check_srf_call_placement(ParseState *pstate, Node *last_srf, int location)
2511 {
2512  const char *err;
2513  bool errkind;
2514 
2515  /*
2516  * Check to see if the set-returning function is in an invalid place
2517  * within the query. Basically, we don't allow SRFs anywhere except in
2518  * the targetlist (which includes GROUP BY/ORDER BY expressions), VALUES,
2519  * and functions in FROM.
2520  *
2521  * For brevity we support two schemes for reporting an error here: set
2522  * "err" to a custom message, or set "errkind" true if the error context
2523  * is sufficiently identified by what ParseExprKindName will return, *and*
2524  * what it will return is just a SQL keyword. (Otherwise, use a custom
2525  * message to avoid creating translation problems.)
2526  */
2527  err = NULL;
2528  errkind = false;
2529  switch (pstate->p_expr_kind)
2530  {
2531  case EXPR_KIND_NONE:
2532  Assert(false); /* can't happen */
2533  break;
2534  case EXPR_KIND_OTHER:
2535  /* Accept SRF here; caller must throw error if wanted */
2536  break;
2537  case EXPR_KIND_JOIN_ON:
2538  case EXPR_KIND_JOIN_USING:
2539  err = _("set-returning functions are not allowed in JOIN conditions");
2540  break;
2541  case EXPR_KIND_FROM_SUBSELECT:
2542  /* can't get here, but just in case, throw an error */
2543  errkind = true;
2544  break;
2545  case EXPR_KIND_FROM_FUNCTION:
2546  /* okay, but we don't allow nested SRFs here */
2547  /* errmsg is chosen to match transformRangeFunction() */
2548  /* errposition should point to the inner SRF */
2549  if (pstate->p_last_srf != last_srf)
2550  ereport(ERROR,
2551  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2552  errmsg("set-returning functions must appear at top level of FROM"),
2553  parser_errposition(pstate,
2554  exprLocation(pstate->p_last_srf))));
2555  break;
2556  case EXPR_KIND_WHERE:
2557  errkind = true;
2558  break;
2559  case EXPR_KIND_POLICY:
2560  err = _("set-returning functions are not allowed in policy expressions");
2561  break;
2562  case EXPR_KIND_HAVING:
2563  errkind = true;
2564  break;
2565  case EXPR_KIND_FILTER:
2566  errkind = true;
2567  break;
2568  case EXPR_KIND_WINDOW_PARTITION:
2569  case EXPR_KIND_WINDOW_ORDER:
2570  /* okay, these are effectively GROUP BY/ORDER BY */
2571  pstate->p_hasTargetSRFs = true;
2572  break;
2573  case EXPR_KIND_WINDOW_FRAME_RANGE:
2574  case EXPR_KIND_WINDOW_FRAME_ROWS:
2575  case EXPR_KIND_WINDOW_FRAME_GROUPS:
2576  err = _("set-returning functions are not allowed in window definitions");
2577  break;
2578  case EXPR_KIND_SELECT_TARGET:
2579  case EXPR_KIND_INSERT_TARGET:
2580  /* okay */
2581  pstate->p_hasTargetSRFs = true;
2582  break;
2583  case EXPR_KIND_UPDATE_SOURCE:
2584  case EXPR_KIND_UPDATE_TARGET:
2585  /* disallowed because it would be ambiguous what to do */
2586  errkind = true;
2587  break;
2588  case EXPR_KIND_GROUP_BY:
2589  case EXPR_KIND_ORDER_BY:
2590  /* okay */
2591  pstate->p_hasTargetSRFs = true;
2592  break;
2593  case EXPR_KIND_DISTINCT_ON:
2594  /* okay */
2595  pstate->p_hasTargetSRFs = true;
2596  break;
2597  case EXPR_KIND_LIMIT:
2598  case EXPR_KIND_OFFSET:
2599  errkind = true;
2600  break;
2601  case EXPR_KIND_RETURNING:
2602  errkind = true;
2603  break;
2604  case EXPR_KIND_VALUES:
2605  /* SRFs are presently not supported by nodeValuesscan.c */
2606  errkind = true;
2607  break;
2608  case EXPR_KIND_VALUES_SINGLE:
2609  /* okay, since we process this like a SELECT tlist */
2610  pstate->p_hasTargetSRFs = true;
2611  break;
2612  case EXPR_KIND_MERGE_WHEN:
2613  err = _("set-returning functions are not allowed in MERGE WHEN conditions");
2614  break;
2615  case EXPR_KIND_CHECK_CONSTRAINT:
2616  case EXPR_KIND_DOMAIN_CHECK:
2617  err = _("set-returning functions are not allowed in check constraints");
2618  break;
2619  case EXPR_KIND_COLUMN_DEFAULT:
2620  case EXPR_KIND_FUNCTION_DEFAULT:
2621  err = _("set-returning functions are not allowed in DEFAULT expressions");
2622  break;
2623  case EXPR_KIND_INDEX_EXPRESSION:
2624  err = _("set-returning functions are not allowed in index expressions");
2625  break;
2626  case EXPR_KIND_INDEX_PREDICATE:
2627  err = _("set-returning functions are not allowed in index predicates");
2628  break;
2629  case EXPR_KIND_STATS_EXPRESSION:
2630  err = _("set-returning functions are not allowed in statistics expressions");
2631  break;
2632  case EXPR_KIND_ALTER_COL_TRANSFORM:
2633  err = _("set-returning functions are not allowed in transform expressions");
2634  break;
2635  case EXPR_KIND_EXECUTE_PARAMETER:
2636  err = _("set-returning functions are not allowed in EXECUTE parameters");
2637  break;
2638  case EXPR_KIND_TRIGGER_WHEN:
2639  err = _("set-returning functions are not allowed in trigger WHEN conditions");
2640  break;
2641  case EXPR_KIND_PARTITION_BOUND:
2642  err = _("set-returning functions are not allowed in partition bound");
2643  break;
2644  case EXPR_KIND_PARTITION_EXPRESSION:
2645  err = _("set-returning functions are not allowed in partition key expressions");
2646  break;
2647  case EXPR_KIND_CALL_ARGUMENT:
2648  err = _("set-returning functions are not allowed in CALL arguments");
2649  break;
2650  case EXPR_KIND_COPY_WHERE:
2651  err = _("set-returning functions are not allowed in COPY FROM WHERE conditions");
2652  break;
2653  case EXPR_KIND_GENERATED_COLUMN:
2654  err = _("set-returning functions are not allowed in column generation expressions");
2655  break;
2656  case EXPR_KIND_CYCLE_MARK:
2657  errkind = true;
2658  break;
2659 
2660  /*
2661  * There is intentionally no default: case here, so that the
2662  * compiler will warn if we add a new ParseExprKind without
2663  * extending this switch. If we do see an unrecognized value at
2664  * runtime, the behavior will be the same as for EXPR_KIND_OTHER,
2665  * which is sane anyway.
2666  */
2667  }
2668  if (err)
2669  ereport(ERROR,
2670  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2671  errmsg_internal("%s", err),
2672  parser_errposition(pstate, location)));
2673  if (errkind)
2674  ereport(ERROR,
2675  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2676  /* translator: %s is name of a SQL construct, eg GROUP BY */
2677  errmsg("set-returning functions are not allowed in %s",
2678  ParseExprKindName(pstate->p_expr_kind)),
2679  parser_errposition(pstate, location)));
2680 }
InvalidAttrNumber
#define InvalidAttrNumber
Definition: attnum.h:23
bms_free
void bms_free(Bitmapset *a)
Definition: bitmapset.c:194
bms_is_member
bool bms_is_member(int x, const Bitmapset *a)
Definition: bitmapset.c:460
bms_add_member
Bitmapset * bms_add_member(Bitmapset *a, int x)
Definition: bitmapset.c:753
TextDatumGetCString
#define TextDatumGetCString(d)
Definition: builtins.h:95
NameStr
#define NameStr(name)
Definition: c.h:735
int32
signed int int32
Definition: c.h:483
OidIsValid
#define OidIsValid(objectId)
Definition: c.h:764
errmsg_plural
int errmsg_plural(const char *fmt_singular, const char *fmt_plural, unsigned long n,...)
Definition: elog.c:1179
errmsg_internal
int errmsg_internal(const char *fmt,...)
Definition: elog.c:1156
errhint
int errhint(const char *fmt,...)
Definition: elog.c:1316
errcode
int errcode(int sqlerrcode)
Definition: elog.c:858
errmsg
int errmsg(const char *fmt,...)
Definition: elog.c:1069
errhint_plural
int errhint_plural(const char *fmt_singular, const char *fmt_plural, unsigned long n,...)
Definition: elog.c:1338
_
#define _(x)
Definition: elog.c:91
ERROR
#define ERROR
Definition: elog.h:39
ereport
#define ereport(elevel,...)
Definition: elog.h:149
err
void err(int eval, const char *fmt,...)
Definition: err.c:43
format_type_be
char * format_type_be(Oid type_oid)
Definition: format_type.c:343
get_expr_result_tupdesc
TupleDesc get_expr_result_tupdesc(Node *expr, bool noError)
Definition: funcapi.c:543
HeapTupleIsValid
#define HeapTupleIsValid(tuple)
Definition: htup.h:78
htup_details.h
GETSTRUCT
#define GETSTRUCT(TUP)
Definition: htup_details.h:653
funcname
#define funcname
Definition: indent_codes.h:69
i
int i
Definition: isn.c:73
Assert
Assert(fmt[strlen(fmt) - 1] !='\n')
list_delete_first_n
List * list_delete_first_n(List *list, int n)
Definition: list.c:982
list_truncate
List * list_truncate(List *list, int new_size)
Definition: list.c:630
lappend
List * lappend(List *list, void *datum)
Definition: list.c:338
list_copy_tail
List * list_copy_tail(const List *oldlist, int nskip)
Definition: list.c:1612
get_func_prokind
char get_func_prokind(Oid funcid)
Definition: lsyscache.c:1822
get_base_element_type
Oid get_base_element_type(Oid typid)
Definition: lsyscache.c:2814
getBaseType
Oid getBaseType(Oid typid)
Definition: lsyscache.c:2503
get_array_type
Oid get_array_type(Oid typid)
Definition: lsyscache.c:2769
get_type_category_preferred
void get_type_category_preferred(Oid typid, char *typcategory, bool *typispreferred)
Definition: lsyscache.c:2692
makeTypeNameFromNameList
TypeName * makeTypeNameFromNameList(List *names)
Definition: makefuncs.c:459
pfree
void pfree(void *pointer)
Definition: mcxt.c:1456
FuncnameGetCandidates
FuncCandidateList FuncnameGetCandidates(List *names, int nargs, List *argnames, bool expand_variadic, bool expand_defaults, bool include_out_arguments, bool missing_ok)
Definition: namespace.c:934
NameListToString
char * NameListToString(const List *names)
Definition: namespace.c:3127
generate_unaccent_rules.str
str
Definition: generate_unaccent_rules.py:280
exprType
Oid exprType(const Node *expr)
Definition: nodeFuncs.c:43
exprLocation
int exprLocation(const Node *expr)
Definition: nodeFuncs.c:1312
IsA
#define IsA(nodeptr, _type_)
Definition: nodes.h:179
AGGSPLIT_SIMPLE
@ AGGSPLIT_SIMPLE
Definition: nodes.h:387
makeNode
#define makeNode(_type_)
Definition: nodes.h:176
castNode
#define castNode(_type_, nodeptr)
Definition: nodes.h:197
transformWindowFuncCall
void transformWindowFuncCall(ParseState *pstate, WindowFunc *wfunc, WindowDef *windef)
Definition: parse_agg.c:809
transformAggregateCall
void transformAggregateCall(ParseState *pstate, Aggref *agg, List *args, List *aggorder, bool agg_distinct)
Definition: parse_agg.c:103
parse_agg.h
transformWhereClause
Node * transformWhereClause(ParseState *pstate, Node *clause, ParseExprKind exprKind, const char *constructName)
Definition: parse_clause.c:1848
parse_clause.h
TypeCategory
TYPCATEGORY TypeCategory(Oid type)
Definition: parse_coerce.c:2941
enforce_generic_type_consistency
Oid enforce_generic_type_consistency(const Oid *actual_arg_types, Oid *declared_arg_types, int nargs, Oid rettype, bool allow_poly)
Definition: parse_coerce.c:2096
coerce_type
Node * coerce_type(ParseState *pstate, Node *node, Oid inputTypeId, Oid targetTypeId, int32 targetTypeMod, CoercionContext ccontext, CoercionForm cformat, int location)
Definition: parse_coerce.c:157
find_coercion_pathway
CoercionPathType find_coercion_pathway(Oid targetTypeId, Oid sourceTypeId, CoercionContext ccontext, Oid *funcid)
Definition: parse_coerce.c:3118
select_common_typmod
int32 select_common_typmod(ParseState *pstate, List *exprs, Oid common_type)
Definition: parse_coerce.c:1609
IsPreferredType
bool IsPreferredType(TYPCATEGORY category, Oid type)
Definition: parse_coerce.c:2960
select_common_type
Oid select_common_type(ParseState *pstate, List *exprs, const char *context, Node **which_expr)
Definition: parse_coerce.c:1307
can_coerce_type
bool can_coerce_type(int nargs, const Oid *input_typeids, const Oid *target_typeids, CoercionContext ccontext)
Definition: parse_coerce.c:556
parse_coerce.h
TYPCATEGORY
char TYPCATEGORY
Definition: parse_coerce.h:21
CoercionPathType
CoercionPathType
Definition: parse_coerce.h:25
COERCION_PATH_COERCEVIAIO
@ COERCION_PATH_COERCEVIAIO
Definition: parse_coerce.h:30
COERCION_PATH_RELABELTYPE
@ COERCION_PATH_RELABELTYPE
Definition: parse_coerce.h:28
ParseExprKindName
const char * ParseExprKindName(ParseExprKind exprKind)
Definition: parse_expr.c:3064
parse_expr.h
ParseComplexProjection
static Node * ParseComplexProjection(ParseState *pstate, const char *funcname, Node *first_arg, int location)
Definition: parse_func.c:1911
make_fn_arguments
void make_fn_arguments(ParseState *pstate, List *fargs, Oid *actual_arg_types, Oid *declared_arg_types)
Definition: parse_func.c:1824
LookupFuncNameInternal
static Oid LookupFuncNameInternal(ObjectType objtype, List *funcname, int nargs, const Oid *argtypes, bool include_out_arguments, bool missing_ok, FuncLookupError *lookupError)
Definition: parse_func.c:2048
func_select_candidate
FuncCandidateList func_select_candidate(int nargs, Oid *input_typeids, FuncCandidateList candidates)
Definition: parse_func.c:1007
unify_hypothetical_args
static void unify_hypothetical_args(ParseState *pstate, List *fargs, int numAggregatedArgs, Oid *actual_arg_types, Oid *declared_arg_types)
Definition: parse_func.c:1740
func_get_detail
FuncDetailCode func_get_detail(List *funcname, List *fargs, List *fargnames, int nargs, Oid *argtypes, bool expand_variadic, bool expand_defaults, bool include_out_arguments, Oid *funcid, Oid *rettype, bool *retset, int *nvargs, Oid *vatype, Oid **true_typeids, List **argdefaults)
Definition: parse_func.c:1394
func_signature_string
const char * func_signature_string(List *funcname, int nargs, List *argnames, const Oid *argtypes)
Definition: parse_func.c:2029
check_srf_call_placement
void check_srf_call_placement(ParseState *pstate, Node *last_srf, int location)
Definition: parse_func.c:2510
ParseFuncOrColumn
Node * ParseFuncOrColumn(ParseState *pstate, List *funcname, List *fargs, Node *last_srf, FuncCall *fn, bool proc_call, int location)
Definition: parse_func.c:90
FuncNameAsType
static Oid FuncNameAsType(List *funcname)
Definition: parse_func.c:1880
LookupFuncWithArgs
Oid LookupFuncWithArgs(ObjectType objtype, ObjectWithArgs *func, bool missing_ok)
Definition: parse_func.c:2205
funcname_signature_string
const char * funcname_signature_string(const char *funcname, int nargs, List *argnames, const Oid *argtypes)
Definition: parse_func.c:1992
func_match_argtypes
int func_match_argtypes(int nargs, Oid *input_typeids, FuncCandidateList raw_candidates, FuncCandidateList *candidates)
Definition: parse_func.c:922
FuncLookupError
FuncLookupError
Definition: parse_func.c:40
FUNCLOOKUP_NOSUCHFUNC
@ FUNCLOOKUP_NOSUCHFUNC
Definition: parse_func.c:41
FUNCLOOKUP_AMBIGUOUS
@ FUNCLOOKUP_AMBIGUOUS
Definition: parse_func.c:42
LookupFuncName
Oid LookupFuncName(List *funcname, int nargs, const Oid *argtypes, bool missing_ok)
Definition: parse_func.c:2143
parse_func.h
FuncDetailCode
FuncDetailCode
Definition: parse_func.h:23
FUNCDETAIL_MULTIPLE
@ FUNCDETAIL_MULTIPLE
Definition: parse_func.h:25
FUNCDETAIL_NORMAL
@ FUNCDETAIL_NORMAL
Definition: parse_func.h:26
FUNCDETAIL_PROCEDURE
@ FUNCDETAIL_PROCEDURE
Definition: parse_func.h:27
FUNCDETAIL_WINDOWFUNC
@ FUNCDETAIL_WINDOWFUNC
Definition: parse_func.h:29
FUNCDETAIL_NOTFOUND
@ FUNCDETAIL_NOTFOUND
Definition: parse_func.h:24
FUNCDETAIL_COERCION
@ FUNCDETAIL_COERCION
Definition: parse_func.h:30
FUNCDETAIL_AGGREGATE
@ FUNCDETAIL_AGGREGATE
Definition: parse_func.h:28
cancel_parser_errposition_callback
void cancel_parser_errposition_callback(ParseCallbackState *pcbstate)
Definition: parse_node.c:161
parser_errposition
int parser_errposition(ParseState *pstate, int location)
Definition: parse_node.c:111
setup_parser_errposition_callback
void setup_parser_errposition_callback(ParseCallbackState *pcbstate, ParseState *pstate, int location)
Definition: parse_node.c:145
EXPR_KIND_EXECUTE_PARAMETER
@ EXPR_KIND_EXECUTE_PARAMETER
Definition: parse_node.h:75
EXPR_KIND_DOMAIN_CHECK
@ EXPR_KIND_DOMAIN_CHECK
Definition: parse_node.h:68
EXPR_KIND_COPY_WHERE
@ EXPR_KIND_COPY_WHERE
Definition: parse_node.h:81
EXPR_KIND_COLUMN_DEFAULT
@ EXPR_KIND_COLUMN_DEFAULT
Definition: parse_node.h:69
EXPR_KIND_DISTINCT_ON
@ EXPR_KIND_DISTINCT_ON
Definition: parse_node.h:61
EXPR_KIND_MERGE_WHEN
@ EXPR_KIND_MERGE_WHEN
Definition: parse_node.h:58
EXPR_KIND_STATS_EXPRESSION
@ EXPR_KIND_STATS_EXPRESSION
Definition: parse_node.h:73
EXPR_KIND_INDEX_EXPRESSION
@ EXPR_KIND_INDEX_EXPRESSION
Definition: parse_node.h:71
EXPR_KIND_PARTITION_BOUND
@ EXPR_KIND_PARTITION_BOUND
Definition: parse_node.h:78
EXPR_KIND_FUNCTION_DEFAULT
@ EXPR_KIND_FUNCTION_DEFAULT
Definition: parse_node.h:70
EXPR_KIND_WINDOW_FRAME_RANGE
@ EXPR_KIND_WINDOW_FRAME_RANGE
Definition: parse_node.h:51
EXPR_KIND_VALUES
@ EXPR_KIND_VALUES
Definition: parse_node.h:65
EXPR_KIND_FROM_SUBSELECT
@ EXPR_KIND_FROM_SUBSELECT
Definition: parse_node.h:44
EXPR_KIND_POLICY
@ EXPR_KIND_POLICY
Definition: parse_node.h:77
EXPR_KIND_WINDOW_FRAME_GROUPS
@ EXPR_KIND_WINDOW_FRAME_GROUPS
Definition: parse_node.h:53
EXPR_KIND_PARTITION_EXPRESSION
@ EXPR_KIND_PARTITION_EXPRESSION
Definition: parse_node.h:79
EXPR_KIND_JOIN_USING
@ EXPR_KIND_JOIN_USING
Definition: parse_node.h:43
EXPR_KIND_INDEX_PREDICATE
@ EXPR_KIND_INDEX_PREDICATE
Definition: parse_node.h:72
EXPR_KIND_ORDER_BY
@ EXPR_KIND_ORDER_BY
Definition: parse_node.h:60
EXPR_KIND_OFFSET
@ EXPR_KIND_OFFSET
Definition: parse_node.h:63
EXPR_KIND_JOIN_ON
@ EXPR_KIND_JOIN_ON
Definition: parse_node.h:42
EXPR_KIND_HAVING
@ EXPR_KIND_HAVING
Definition: parse_node.h:47
EXPR_KIND_INSERT_TARGET
@ EXPR_KIND_INSERT_TARGET
Definition: parse_node.h:55
EXPR_KIND_ALTER_COL_TRANSFORM
@ EXPR_KIND_ALTER_COL_TRANSFORM
Definition: parse_node.h:74
EXPR_KIND_LIMIT
@ EXPR_KIND_LIMIT
Definition: parse_node.h:62
EXPR_KIND_WHERE
@ EXPR_KIND_WHERE
Definition: parse_node.h:46
EXPR_KIND_UPDATE_TARGET
@ EXPR_KIND_UPDATE_TARGET
Definition: parse_node.h:57
EXPR_KIND_SELECT_TARGET
@ EXPR_KIND_SELECT_TARGET
Definition: parse_node.h:54
EXPR_KIND_RETURNING
@ EXPR_KIND_RETURNING
Definition: parse_node.h:64
EXPR_KIND_GENERATED_COLUMN
@ EXPR_KIND_GENERATED_COLUMN
Definition: parse_node.h:82
EXPR_KIND_NONE
@ EXPR_KIND_NONE
Definition: parse_node.h:40
EXPR_KIND_CALL_ARGUMENT
@ EXPR_KIND_CALL_ARGUMENT
Definition: parse_node.h:80
EXPR_KIND_GROUP_BY
@ EXPR_KIND_GROUP_BY
Definition: parse_node.h:59
EXPR_KIND_OTHER
@ EXPR_KIND_OTHER
Definition: parse_node.h:41
EXPR_KIND_FROM_FUNCTION
@ EXPR_KIND_FROM_FUNCTION
Definition: parse_node.h:45
EXPR_KIND_TRIGGER_WHEN
@ EXPR_KIND_TRIGGER_WHEN
Definition: parse_node.h:76
EXPR_KIND_FILTER
@ EXPR_KIND_FILTER
Definition: parse_node.h:48
EXPR_KIND_UPDATE_SOURCE
@ EXPR_KIND_UPDATE_SOURCE
Definition: parse_node.h:56
EXPR_KIND_CHECK_CONSTRAINT
@ EXPR_KIND_CHECK_CONSTRAINT
Definition: parse_node.h:67
EXPR_KIND_WINDOW_PARTITION
@ EXPR_KIND_WINDOW_PARTITION
Definition: parse_node.h:49
EXPR_KIND_CYCLE_MARK
@ EXPR_KIND_CYCLE_MARK
Definition: parse_node.h:83
EXPR_KIND_WINDOW_FRAME_ROWS
@ EXPR_KIND_WINDOW_FRAME_ROWS
Definition: parse_node.h:52
EXPR_KIND_WINDOW_ORDER
@ EXPR_KIND_WINDOW_ORDER
Definition: parse_node.h:50
EXPR_KIND_VALUES_SINGLE
@ EXPR_KIND_VALUES_SINGLE
Definition: parse_node.h:66
GetNSItemByRangeTablePosn
ParseNamespaceItem * GetNSItemByRangeTablePosn(ParseState *pstate, int varno, int sublevels_up)
Definition: parse_relation.c:510
scanNSItemForColumn
Node * scanNSItemForColumn(ParseState *pstate, ParseNamespaceItem *nsitem, int sublevels_up, const char *colname, int location)
Definition: parse_relation.c:680
parse_relation.h
expandRecordVariable
TupleDesc expandRecordVariable(ParseState *pstate, Var *var, int levelsup)
Definition: parse_target.c:1506
parse_target.h
typeTypeRelid
Oid typeTypeRelid(Type typ)
Definition: parse_type.c:630
LookupTypeNameExtended
Type LookupTypeNameExtended(ParseState *pstate, const TypeName *typeName, int32 *typmod_p, bool temp_ok, bool missing_ok)
Definition: parse_type.c:73
typeTypeId
Oid typeTypeId(Type tp)
Definition: parse_type.c:590
LookupTypeNameOid
Oid LookupTypeNameOid(ParseState *pstate, const TypeName *typeName, bool missing_ok)
Definition: parse_type.c:232
parse_type.h
ISCOMPLEX
#define ISCOMPLEX(typeid)
Definition: parse_type.h:59
FUNC_PARAM_DEFAULT
@ FUNC_PARAM_DEFAULT
Definition: parsenodes.h:3322
ObjectType
ObjectType
Definition: parsenodes.h:2119
OBJECT_AGGREGATE
@ OBJECT_AGGREGATE
Definition: parsenodes.h:2121
OBJECT_ROUTINE
@ OBJECT_ROUTINE
Definition: parsenodes.h:2154
OBJECT_PROCEDURE
@ OBJECT_PROCEDURE
Definition: parsenodes.h:2149
OBJECT_FUNCTION
@ OBJECT_FUNCTION
Definition: parsenodes.h:2139
pg_aggregate.h
Form_pg_aggregate
FormData_pg_aggregate * Form_pg_aggregate
Definition: pg_aggregate.h:109
Form_pg_attribute
FormData_pg_attribute * Form_pg_attribute
Definition: pg_attribute.h:209
arg
void * arg
Definition: pg_backup_utils.c:27
FUNC_MAX_ARGS
#define FUNC_MAX_ARGS
Definition: pg_config_manual.h:43
lfirst
#define lfirst(lc)
Definition: pg_list.h:172
llast
#define llast(l)
Definition: pg_list.h:198
lfirst_node
#define lfirst_node(type, lc)
Definition: pg_list.h:176
list_length
static int list_length(const List *l)
Definition: pg_list.h:152
NIL
#define NIL
Definition: pg_list.h:68
list_head
static ListCell * list_head(const List *l)
Definition: pg_list.h:128
list_nth_cell
static ListCell * list_nth_cell(const List *list, int n)
Definition: pg_list.h:277
linitial
#define linitial(l)
Definition: pg_list.h:178
lnext
static ListCell * lnext(const List *l, const ListCell *c)
Definition: pg_list.h:343
list_make2
#define list_make2(x1, x2)
Definition: pg_list.h:214
foreach_delete_current
#define foreach_delete_current(lst, cell)
Definition: pg_list.h:390
pg_proc.h
Form_pg_proc
FormData_pg_proc * Form_pg_proc
Definition: pg_proc.h:136
pronargs
int16 pronargs
Definition: pg_proc.h:81
pg_type.h
Form_pg_type
FormData_pg_type * Form_pg_type
Definition: pg_type.h:261
Datum
uintptr_t Datum
Definition: postgres.h:64
ObjectIdGetDatum
static Datum ObjectIdGetDatum(Oid X)
Definition: postgres.h:252
InvalidOid
#define InvalidOid
Definition: postgres_ext.h:36
Oid
unsigned int Oid
Definition: postgres_ext.h:31
CoercionForm
CoercionForm
Definition: primnodes.h:660
COERCE_IMPLICIT_CAST
@ COERCE_IMPLICIT_CAST
Definition: primnodes.h:663
COERCE_EXPLICIT_CALL
@ COERCE_EXPLICIT_CALL
Definition: primnodes.h:661
COERCION_EXPLICIT
@ COERCION_EXPLICIT
Definition: primnodes.h:644
COERCION_IMPLICIT
@ COERCION_IMPLICIT
Definition: primnodes.h:641
stringToNode
void * stringToNode(const char *str)
Definition: read.c:90
appendStringInfo
void appendStringInfo(StringInfo str, const char *fmt,...)
Definition: stringinfo.c:91
appendStringInfoString
void appendStringInfoString(StringInfo str, const char *s)
Definition: stringinfo.c:176
appendStringInfoChar
void appendStringInfoChar(StringInfo str, char ch)
Definition: stringinfo.c:188
initStringInfo
void initStringInfo(StringInfo str)
Definition: stringinfo.c:59
Aggref::aggfnoid
Oid aggfnoid
Definition: primnodes.h:422
Aggref::aggfilter
Expr * aggfilter
Definition: primnodes.h:455
Aggref::location
int location
Definition: primnodes.h:485
ArrayExpr::location
int location
Definition: primnodes.h:1311
ArrayExpr::elements
List * elements
Definition: primnodes.h:1307
FieldSelect::fieldnum
AttrNumber fieldnum
Definition: primnodes.h:1056
FieldSelect::arg
Expr * arg
Definition: primnodes.h:1055
FuncExpr::funcid
Oid funcid
Definition: primnodes.h:677
FuncExpr::args
List * args
Definition: primnodes.h:695
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int location
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