Age Owner TLA Line data Source code
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 *
7670 tgl 90 CBC 352327 : ParseFuncOrColumn(ParseState *pstate, List *funcname, List *fargs,
91 : Node *last_srf, FuncCall *fn, bool proc_call, int location)
92 : {
3394 93 352327 : bool is_column = (fn == NULL);
94 352327 : List *agg_order = (fn ? fn->agg_order : NIL);
95 352327 : Expr *agg_filter = NULL;
886 96 352327 : WindowDef *over = (fn ? fn->over : NULL);
3394 97 352327 : bool agg_within_group = (fn ? fn->agg_within_group : false);
98 352327 : bool agg_star = (fn ? fn->agg_star : false);
99 352327 : bool agg_distinct = (fn ? fn->agg_distinct : false);
100 352327 : bool func_variadic = (fn ? fn->func_variadic : false);
886 101 352327 : CoercionForm funcformat = (fn ? fn->funcformat : COERCE_EXPLICIT_CALL);
102 : bool could_be_projection;
103 : Oid rettype;
104 : Oid funcid;
105 : ListCell *l;
9266 bruce 106 352327 : 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;
3394 tgl 118 352327 : char aggkind = 0;
119 : ParseCallbackState pcbstate;
120 :
121 : /*
122 : * If there's an aggregate filter, transform it using transformWhereClause
123 : */
124 352327 : if (fn && fn->agg_filter != NULL)
125 339 : 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 : */
6500 135 352321 : if (list_length(fargs) > FUNC_MAX_ARGS)
7205 tgl 136 UBC 0 : 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 : */
6500 tgl 154 CBC 352321 : nargs = 0;
1364 155 799802 : foreach(l, fargs)
156 : {
6500 157 447481 : Node *arg = lfirst(l);
158 447481 : Oid argtype = exprType(arg);
159 :
3394 160 447481 : if (argtype == VOIDOID && IsA(arg, Param) &&
3394 tgl 161 UBC 0 : !is_column && !agg_within_group)
162 : {
1364 163 0 : fargs = foreach_delete_current(fargs, l);
6500 164 0 : continue;
165 : }
166 :
6500 tgl 167 CBC 447481 : 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 : */
4931 178 352321 : argnames = NIL;
179 799796 : foreach(l, fargs)
180 : {
4790 bruce 181 447481 : Node *arg = lfirst(l);
182 :
4931 tgl 183 447481 : if (IsA(arg, NamedArgExpr))
184 : {
185 17308 : NamedArgExpr *na = (NamedArgExpr *) arg;
186 : ListCell *lc;
187 :
188 : /* Reject duplicate arg names */
189 37622 : foreach(lc, argnames)
190 : {
191 20317 : if (strcmp(na->name, (char *) lfirst(lc)) == 0)
192 3 : 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 17305 : argnames = lappend(argnames, na->name);
199 : }
200 : else
201 : {
202 430173 : if (argnames != NIL)
203 3 : ereport(ERROR,
204 : (errcode(ERRCODE_SYNTAX_ERROR),
205 : errmsg("positional argument cannot follow named argument"),
206 : parser_errposition(pstate, exprLocation(arg))));
207 : }
208 : }
209 :
9266 bruce 210 352315 : if (fargs)
211 : {
6892 neilc 212 282886 : first_arg = linitial(fargs);
7205 tgl 213 282886 : 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 : */
1756 223 149386 : could_be_projection = (nargs == 1 && !proc_call &&
224 148216 : agg_order == NIL && agg_filter == NULL &&
225 147933 : !agg_star && !agg_distinct && over == NULL &&
226 293224 : !func_variadic && argnames == NIL &&
227 648159 : list_length(funcname) == 1 &&
228 248723 : (actual_arg_types[0] == RECORDOID ||
229 120155 : ISCOMPLEX(actual_arg_types[0])));
230 :
231 : /*
232 : * If it's column syntax, check for column projection case first.
233 : */
234 352315 : if (could_be_projection && is_column)
235 : {
236 32745 : retval = ParseComplexProjection(pstate,
237 32745 : strVal(linitial(funcname)),
238 : first_arg,
239 : location);
240 32745 : if (retval)
241 32639 : 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 :
2944 alvherre 264 319676 : setup_parser_errposition_callback(&pcbstate, pstate, location);
265 :
4931 tgl 266 319676 : fdresult = func_get_detail(funcname, fargs, argnames, nargs,
267 : actual_arg_types,
668 268 319676 : !func_variadic, true, proc_call,
269 : &funcid, &rettype, &retset,
270 : &nvargs, &vatype,
5239 peter_e 271 319676 : &declared_arg_types, &argdefaults);
272 :
2944 alvherre 273 319676 : 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 */
1758 tgl 280 319676 : if (proc_call &&
281 202 : (fdresult == FUNCDETAIL_NORMAL ||
282 199 : fdresult == FUNCDETAIL_AGGREGATE ||
283 199 : fdresult == FUNCDETAIL_WINDOWFUNC ||
284 : fdresult == FUNCDETAIL_COERCION))
285 9 : 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 319667 : if (fdresult == FUNCDETAIL_PROCEDURE && !proc_call)
295 3 : 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 319664 : if (fdresult == FUNCDETAIL_NORMAL ||
305 24838 : 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 : */
7668 312 295058 : if (agg_star)
7205 tgl 313 UBC 0 : 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)));
7668 tgl 319 CBC 295058 : if (agg_distinct)
7205 tgl 320 UBC 0 : 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)));
3394 tgl 325 CBC 295058 : if (agg_within_group)
3394 tgl 326 UBC 0 : 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)));
4863 tgl 331 CBC 295058 : if (agg_order != NIL)
4863 tgl 332 UBC 0 : 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)));
3554 noah 337 CBC 295058 : if (agg_filter)
3554 noah 338 UBC 0 : 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)));
5215 tgl 343 CBC 295058 : if (over)
344 3 : 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 : */
1758 354 319661 : if (fdresult == FUNCDETAIL_NORMAL || fdresult == FUNCDETAIL_PROCEDURE)
355 : {
356 : /* Nothing special to do for these cases. */
357 : }
3394 358 24838 : 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 23307 : tup = SearchSysCache1(AGGFNOID, ObjectIdGetDatum(funcid));
2118 368 23307 : if (!HeapTupleIsValid(tup)) /* should not happen */
3394 tgl 369 UBC 0 : elog(ERROR, "cache lookup failed for aggregate %u", funcid);
3394 tgl 370 CBC 23307 : classForm = (Form_pg_aggregate) GETSTRUCT(tup);
371 23307 : aggkind = classForm->aggkind;
372 23307 : catDirectArgs = classForm->aggnumdirectargs;
373 23307 : ReleaseSysCache(tup);
374 :
375 : /* Now check various disallowed cases. */
376 23307 : if (AGGKIND_IS_ORDERED_SET(aggkind))
377 : {
378 : int numAggregatedArgs;
379 : int numDirectArgs;
380 :
381 171 : if (!agg_within_group)
382 3 : 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)));
387 168 : if (over)
3394 tgl 388 UBC 0 : 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 */
3394 tgl 394 CBC 168 : Assert(!agg_distinct);
395 : /* gram.y rejects VARIADIC + WITHIN GROUP */
396 168 : 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 : */
407 168 : numAggregatedArgs = list_length(agg_order);
408 168 : numDirectArgs = nargs - numAggregatedArgs;
409 168 : Assert(numDirectArgs >= 0);
410 :
411 168 : if (!OidIsValid(vatype))
412 : {
413 : /* Test is simple if aggregate isn't variadic */
414 93 : if (numDirectArgs != catDirectArgs)
3394 tgl 415 UBC 0 : 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 :
3394 tgl 439 CBC 75 : pronargs = nargs;
440 75 : if (nvargs > 1)
441 75 : pronargs -= nvargs - 1;
442 75 : if (catDirectArgs < pronargs)
443 : {
444 : /* VARIADIC isn't part of direct args, so still easy */
3394 tgl 445 UBC 0 : if (numDirectArgs != catDirectArgs)
446 0 : 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 : */
3394 tgl 470 CBC 75 : if (aggkind == AGGKIND_HYPOTHETICAL)
471 : {
472 75 : if (nvargs != 2 * numAggregatedArgs)
473 3 : 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 : {
3394 tgl 486 UBC 0 : if (nvargs <= numAggregatedArgs)
487 0 : 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 */
3394 tgl 504 CBC 165 : if (aggkind == AGGKIND_HYPOTHETICAL)
505 72 : 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 23136 : if (agg_within_group)
512 3 : 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 1531 : else if (fdresult == FUNCDETAIL_WINDOWFUNC)
520 : {
521 : /*
522 : * True window functions must be called with a window definition.
523 : */
524 1008 : if (!over)
3394 tgl 525 UBC 0 : 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 */
3394 tgl 531 CBC 1008 : if (agg_within_group)
3394 tgl 532 UBC 0 : 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 : }
1758 tgl 538 CBC 523 : 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 : */
544 232 : return coerce_type(pstate, linitial(fargs),
545 : actual_arg_types[0], rettype, -1,
546 : COERCION_EXPLICIT, COERCE_EXPLICIT_CALL, location);
547 : }
1756 548 291 : 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 15 : if (is_column)
1756 tgl 558 UBC 0 : return NULL;
559 :
1737 peter_e 560 CBC 15 : if (proc_call)
1737 peter_e 561 UBC 0 : 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
1737 peter_e 570 CBC 15 : 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 : */
7689 tgl 586 276 : if (is_column)
4908 587 49 : return NULL;
588 :
589 : /*
590 : * Check for column projection interpretation, since we didn't before.
591 : */
1756 592 227 : if (could_be_projection)
593 : {
594 78 : retval = ParseComplexProjection(pstate,
595 78 : strVal(linitial(funcname)),
596 : first_arg,
597 : location);
598 78 : if (retval)
599 72 : 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 : */
606 155 : if (list_length(agg_order) > 1 && !agg_within_group)
607 : {
608 : /* It's agg(x, ORDER BY y,z) ... perhaps misplaced ORDER BY */
4630 tgl 609 UBC 0 : 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 : }
1737 peter_e 619 CBC 155 : else if (proc_call)
620 6 : 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
7219 tgl 629 149 : 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 : */
5225 646 319123 : nargsplusdefs = nargs;
647 327559 : foreach(l, argdefaults)
648 : {
5050 bruce 649 8436 : Node *expr = (Node *) lfirst(l);
650 :
651 : /* probably shouldn't happen ... */
5225 tgl 652 8436 : if (nargsplusdefs >= FUNC_MAX_ARGS)
5225 tgl 653 UBC 0 : 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 :
5225 tgl 661 CBC 8436 : 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 : */
7306 669 319123 : 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 */
7285 676 319090 : 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 : */
3293 683 319082 : if (!OidIsValid(vatype))
684 : {
685 316161 : Assert(nvargs == 0);
686 316161 : 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 319082 : if (nvargs > 0 && vatype != ANYOID)
694 : {
5050 bruce 695 1254 : ArrayExpr *newa = makeNode(ArrayExpr);
696 1254 : int non_var_args = nargs - nvargs;
697 : List *vargs;
698 :
5380 tgl 699 1254 : Assert(non_var_args >= 0);
700 1254 : vargs = list_copy_tail(fargs, non_var_args);
701 1254 : fargs = list_truncate(fargs, non_var_args);
702 :
703 1254 : newa->elements = vargs;
704 : /* assume all the variadic arguments were coerced to the same type */
705 1254 : newa->element_typeid = exprType((Node *) linitial(vargs));
706 1254 : newa->array_typeid = get_array_type(newa->element_typeid);
707 1254 : if (!OidIsValid(newa->array_typeid))
5380 tgl 708 UBC 0 : 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 */
5380 tgl 714 CBC 1254 : newa->multidims = false;
5337 715 1254 : newa->location = exprLocation((Node *) vargs);
716 :
5380 717 1254 : fargs = lappend(fargs, newa);
718 :
719 : /* We could not have had VARIADIC marking before ... */
3293 720 1254 : Assert(!func_variadic);
721 : /* ... but now, it's a VARIADIC call */
722 1254 : 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 : */
3552 andrew 729 319082 : if (nargs > 0 && vatype == ANYOID && func_variadic)
730 : {
3293 tgl 731 177 : Oid va_arr_typid = actual_arg_types[nargs - 1];
732 :
733 177 : if (!OidIsValid(get_base_element_type(va_arr_typid)))
3552 andrew 734 3 : 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 */
2399 tgl 742 319079 : if (retset)
2126 743 36749 : check_srf_call_placement(pstate, last_srf, location);
744 :
745 : /* build the appropriate output structure */
1956 peter_e 746 319046 : if (fdresult == FUNCDETAIL_NORMAL || fdresult == FUNCDETAIL_PROCEDURE)
9266 bruce 747 294746 : {
7423 tgl 748 294746 : FuncExpr *funcexpr = makeNode(FuncExpr);
749 :
750 294746 : funcexpr->funcid = funcid;
751 294746 : funcexpr->funcresulttype = rettype;
752 294746 : funcexpr->funcretset = retset;
3730 753 294746 : funcexpr->funcvariadic = func_variadic;
886 754 294746 : funcexpr->funcformat = funcformat;
755 : /* funccollid and inputcollid will be set by parse_collate.c */
7423 756 294746 : funcexpr->args = fargs;
5337 757 294746 : funcexpr->location = location;
758 :
7423 759 294746 : retval = (Node *) funcexpr;
760 : }
5215 761 24300 : else if (fdresult == FUNCDETAIL_AGGREGATE && !over)
7995 bruce 762 22491 : {
763 : /* aggregate function */
7668 tgl 764 22578 : Aggref *aggref = makeNode(Aggref);
765 :
766 22578 : aggref->aggfnoid = funcid;
2478 767 22578 : aggref->aggtype = rettype;
768 : /* aggcollid and inputcollid will be set by parse_collate.c */
2118 769 22578 : 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 */
3554 noah 773 22578 : aggref->aggfilter = agg_filter;
3505 tgl 774 22578 : aggref->aggstar = agg_star;
775 22578 : aggref->aggvariadic = func_variadic;
3394 776 22578 : aggref->aggkind = aggkind;
250 drowley 777 GNC 22578 : aggref->aggpresorted = false;
4863 tgl 778 ECB : /* agglevelsup will be set by transformAggregateCall */
2118 tgl 779 GIC 22578 : aggref->aggsplit = AGGSPLIT_SIMPLE; /* planner might change this */
866 heikki.linnakangas 780 CBC 22578 : aggref->aggno = -1; /* planner will set aggno and aggtransno */
781 22578 : aggref->aggtransno = -1;
5337 tgl 782 22578 : aggref->location = location;
7995 bruce 783 ECB :
784 : /*
785 : * Reject attempt to call a parameterless aggregate without (*)
786 : * syntax. This is mere pedantry but some folks insisted ...
787 : */
3394 tgl 788 GIC 22578 : if (fargs == NIL && !agg_star && !agg_within_group)
6100 tgl 789 LBC 0 : ereport(ERROR,
6100 tgl 790 EUB : (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 :
5215 tgl 795 GIC 22578 : if (retset)
5215 tgl 796 LBC 0 : ereport(ERROR,
5215 tgl 797 EUB : (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 : */
4931 tgl 810 GIC 22578 : if (argnames != NIL)
4931 tgl 811 LBC 0 : ereport(ERROR,
4931 tgl 812 EUB : (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 */
4771 tgl 817 GIC 22578 : transformAggregateCall(pstate, aggref, fargs, agg_order, agg_distinct);
7247 tgl 818 ECB :
7668 tgl 819 GIC 22491 : retval = (Node *) aggref;
5215 tgl 820 ECB : }
821 : else
822 : {
823 : /* window function */
5215 tgl 824 GIC 1722 : WindowFunc *wfunc = makeNode(WindowFunc);
5215 tgl 825 ECB :
3394 tgl 826 GIC 1722 : Assert(over); /* lack of this was checked above */
2118 tgl 827 CBC 1722 : Assert(!agg_within_group); /* also checked above */
5215 tgl 828 ECB :
5215 tgl 829 GIC 1722 : wfunc->winfnoid = funcid;
5215 tgl 830 CBC 1722 : wfunc->wintype = rettype;
4404 tgl 831 ECB : /* wincollid and inputcollid will be set by parse_collate.c */
5215 tgl 832 GIC 1722 : wfunc->args = fargs;
5215 tgl 833 ECB : /* winref will be set by transformWindowFuncCall */
5215 tgl 834 GIC 1722 : wfunc->winstar = agg_star;
5215 tgl 835 CBC 1722 : wfunc->winagg = (fdresult == FUNCDETAIL_AGGREGATE);
3554 noah 836 1722 : wfunc->aggfilter = agg_filter;
5215 tgl 837 1722 : wfunc->location = location;
5215 tgl 838 ECB :
839 : /*
840 : * agg_star is allowed for aggregate functions but distinct isn't
841 : */
5215 tgl 842 GIC 1722 : if (agg_distinct)
5215 tgl 843 LBC 0 : ereport(ERROR,
5215 tgl 844 EUB : (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 : */
5215 tgl 852 GIC 1722 : if (wfunc->winagg && fargs == NIL && !agg_star)
5215 tgl 853 CBC 3 : ereport(ERROR,
5215 tgl 854 ECB : (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 : */
3394 tgl 862 GIC 1719 : if (agg_order != NIL)
3554 noah 863 LBC 0 : ereport(ERROR,
3394 tgl 864 EUB : (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 : */
3394 tgl 871 GIC 1719 : if (!wfunc->winagg && agg_filter)
4863 tgl 872 LBC 0 : ereport(ERROR,
4863 tgl 873 EUB : (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 : */
2126 tgl 880 GIC 1719 : if (pstate->p_last_srf != last_srf)
2126 tgl 881 CBC 3 : ereport(ERROR,
2126 tgl 882 ECB : (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 :
7668 tgl 888 GIC 1716 : if (retset)
7205 tgl 889 LBC 0 : ereport(ERROR,
7205 tgl 890 EUB : (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 */
5215 tgl 895 GIC 1716 : transformWindowFuncCall(pstate, wfunc, over);
5215 tgl 896 ECB :
5215 tgl 897 GIC 1692 : retval = (Node *) wfunc;
7668 tgl 898 ECB : }
899 :
900 : /* if it returns a set, remember it for error checks at higher levels */
2126 tgl 901 GIC 318929 : if (retset)
2126 tgl 902 CBC 36716 : pstate->p_last_srf = retval;
2126 tgl 903 ECB :
7668 tgl 904 GIC 318929 : return retval;
7668 tgl 905 ECB : }
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
7258 tgl 922 GIC 133258 : func_match_argtypes(int nargs,
7258 tgl 923 ECB : Oid *input_typeids,
924 : FuncCandidateList raw_candidates,
925 : FuncCandidateList *candidates) /* return value */
926 : {
927 : FuncCandidateList current_candidate;
928 : FuncCandidateList next_candidate;
9266 bruce 929 GIC 133258 : int ncandidates = 0;
9266 bruce 930 ECB :
9266 bruce 931 GIC 133258 : *candidates = NULL;
9266 bruce 932 ECB :
7258 tgl 933 GIC 133258 : for (current_candidate = raw_candidates;
9266 bruce 934 CBC 964277 : current_candidate != NULL;
7673 tgl 935 831019 : current_candidate = next_candidate)
9266 bruce 936 ECB : {
7673 tgl 937 GIC 831019 : next_candidate = current_candidate->next;
7668 tgl 938 CBC 831019 : if (can_coerce_type(nargs, input_typeids, current_candidate->args,
7508 tgl 939 ECB : COERCION_IMPLICIT))
940 : {
7673 tgl 941 GIC 159405 : current_candidate->next = *candidates;
7673 tgl 942 CBC 159405 : *candidates = current_candidate;
9266 bruce 943 159405 : ncandidates++;
9266 bruce 944 ECB : }
945 : }
946 :
9266 bruce 947 GIC 133258 : return ncandidates;
2118 tgl 948 ECB : } /* 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
9266 bruce 1007 GIC 9858 : func_select_candidate(int nargs,
9266 bruce 1008 ECB : 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 */
6585 tgl 1029 GIC 9858 : if (nargs > FUNC_MAX_ARGS)
6585 tgl 1030 LBC 0 : ereport(ERROR,
6585 tgl 1031 EUB : (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 : */
4161 tgl 1050 GIC 9858 : nunknowns = 0;
7258 tgl 1051 CBC 30533 : for (i = 0; i < nargs; i++)
4161 tgl 1052 ECB : {
4161 tgl 1053 GIC 20675 : if (input_typeids[i] != UNKNOWNOID)
4161 tgl 1054 CBC 12497 : input_base_typeids[i] = getBaseType(input_typeids[i]);
4161 tgl 1055 ECB : else
1056 : {
1057 : /* no need to call getBaseType on UNKNOWNOID */
4161 tgl 1058 GIC 8178 : input_base_typeids[i] = UNKNOWNOID;
4161 tgl 1059 CBC 8178 : nunknowns++;
4161 tgl 1060 ECB : }
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 : */
9101 lockhart 1067 GIC 9858 : ncandidates = 0;
9101 lockhart 1068 CBC 9858 : nbestMatch = 0;
1069 9858 : last_candidate = NULL;
1070 9858 : for (current_candidate = candidates;
1071 46174 : current_candidate != NULL;
1072 36316 : current_candidate = current_candidate->next)
9101 lockhart 1073 ECB : {
9101 lockhart 1074 GIC 36316 : current_typeids = current_candidate->args;
9101 lockhart 1075 CBC 36316 : nmatch = 0;
1076 111427 : for (i = 0; i < nargs; i++)
9101 lockhart 1077 ECB : {
7258 tgl 1078 GIC 75111 : if (input_base_typeids[i] != UNKNOWNOID &&
7258 tgl 1079 CBC 45399 : current_typeids[i] == input_base_typeids[i])
1080 12936 : nmatch++;
9101 lockhart 1081 ECB : }
1082 :
1083 : /* take this one as the best choice so far? */
9101 lockhart 1084 GIC 36316 : if ((nmatch > nbestMatch) || (last_candidate == NULL))
9101 lockhart 1085 ECB : {
9101 lockhart 1086 GIC 12095 : nbestMatch = nmatch;
9101 lockhart 1087 CBC 12095 : candidates = current_candidate;
1088 12095 : last_candidate = current_candidate;
1089 12095 : ncandidates = 1;
9101 lockhart 1090 ECB : }
1091 : /* no worse than the last choice, so keep this one too? */
9101 lockhart 1092 GIC 24221 : else if (nmatch == nbestMatch)
9101 lockhart 1093 ECB : {
9101 lockhart 1094 GIC 15476 : last_candidate->next = current_candidate;
9101 lockhart 1095 CBC 15476 : last_candidate = current_candidate;
1096 15476 : ncandidates++;
9101 lockhart 1097 ECB : }
1098 : /* otherwise, don't bother keeping this one... */
1099 : }
1100 :
8449 tgl 1101 GIC 9858 : if (last_candidate) /* terminate rebuilt list */
8449 tgl 1102 CBC 9858 : last_candidate->next = NULL;
8449 tgl 1103 ECB :
8811 lockhart 1104 GIC 9858 : if (ncandidates == 1)
7673 tgl 1105 CBC 4212 : return candidates;
8811 lockhart 1106 ECB :
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 : */
7188 bruce 1114 GIC 17776 : for (i = 0; i < nargs; i++) /* avoid multiple lookups */
7258 tgl 1115 CBC 12130 : slot_category[i] = TypeCategory(input_base_typeids[i]);
8421 1116 5646 : ncandidates = 0;
1117 5646 : nbestMatch = 0;
1118 5646 : last_candidate = NULL;
1119 5646 : for (current_candidate = candidates;
1120 25209 : current_candidate != NULL;
1121 19563 : current_candidate = current_candidate->next)
8421 tgl 1122 ECB : {
8421 tgl 1123 GIC 19563 : current_typeids = current_candidate->args;
8421 tgl 1124 CBC 19563 : nmatch = 0;
1125 60955 : for (i = 0; i < nargs; i++)
8421 tgl 1126 ECB : {
7258 tgl 1127 GIC 41392 : if (input_base_typeids[i] != UNKNOWNOID)
8421 tgl 1128 ECB : {
7258 tgl 1129 GIC 31054 : if (current_typeids[i] == input_base_typeids[i] ||
7258 tgl 1130 CBC 13092 : IsPreferredType(slot_category[i], current_typeids[i]))
8421 1131 10603 : nmatch++;
8421 tgl 1132 ECB : }
1133 : }
1134 :
8421 tgl 1135 GIC 19563 : if ((nmatch > nbestMatch) || (last_candidate == NULL))
8421 tgl 1136 ECB : {
8421 tgl 1137 GIC 7700 : nbestMatch = nmatch;
8421 tgl 1138 CBC 7700 : candidates = current_candidate;
1139 7700 : last_candidate = current_candidate;
1140 7700 : ncandidates = 1;
8421 tgl 1141 ECB : }
8421 tgl 1142 GIC 11863 : else if (nmatch == nbestMatch)
8421 tgl 1143 ECB : {
8421 tgl 1144 GIC 8844 : last_candidate->next = current_candidate;
8421 tgl 1145 CBC 8844 : last_candidate = current_candidate;
1146 8844 : ncandidates++;
8421 tgl 1147 ECB : }
1148 : }
1149 :
8421 tgl 1150 GIC 5646 : if (last_candidate) /* terminate rebuilt list */
8421 tgl 1151 CBC 5646 : last_candidate->next = NULL;
8421 tgl 1152 ECB :
8421 tgl 1153 GIC 5646 : if (ncandidates == 1)
7673 tgl 1154 CBC 1717 : return candidates;
8421 tgl 1155 ECB :
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 : */
4161 tgl 1162 GIC 3929 : if (nunknowns == 0)
4161 tgl 1163 CBC 3 : return NULL; /* failed to select a best candidate */
4161 tgl 1164 ECB :
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 : */
8150 tgl 1184 GIC 3926 : resolved_unknowns = false;
8811 lockhart 1185 CBC 12635 : for (i = 0; i < nargs; i++)
9101 lockhart 1186 ECB : {
1187 : bool have_conflict;
1188 :
7258 tgl 1189 GIC 8709 : if (input_base_typeids[i] != UNKNOWNOID)
8150 tgl 1190 CBC 2852 : continue;
2118 1191 5857 : resolved_unknowns = true; /* assume we can do it */
5366 1192 5857 : slot_category[i] = TYPCATEGORY_INVALID;
8150 1193 5857 : slot_has_preferred_type[i] = false;
1194 5857 : have_conflict = false;
1195 5857 : for (current_candidate = candidates;
1196 25810 : current_candidate != NULL;
1197 19953 : current_candidate = current_candidate->next)
9101 lockhart 1198 ECB : {
8150 tgl 1199 GIC 19953 : current_typeids = current_candidate->args;
8150 tgl 1200 CBC 19953 : current_type = current_typeids[i];
5366 1201 19953 : get_type_category_preferred(current_type,
5366 tgl 1202 ECB : ¤t_category,
1203 : ¤t_is_preferred);
5366 tgl 1204 GIC 19953 : if (slot_category[i] == TYPCATEGORY_INVALID)
9101 lockhart 1205 ECB : {
1206 : /* first candidate */
8150 tgl 1207 GIC 5857 : slot_category[i] = current_category;
5366 tgl 1208 CBC 5857 : slot_has_preferred_type[i] = current_is_preferred;
8150 tgl 1209 ECB : }
8150 tgl 1210 GIC 14096 : else if (current_category == slot_category[i])
8150 tgl 1211 ECB : {
1212 : /* more candidates in same category */
5366 tgl 1213 GIC 3790 : slot_has_preferred_type[i] |= current_is_preferred;
8150 tgl 1214 ECB : }
1215 : else
1216 : {
1217 : /* category conflict! */
5366 tgl 1218 GIC 10306 : if (current_category == TYPCATEGORY_STRING)
8811 lockhart 1219 ECB : {
1220 : /* STRING always wins if available */
8150 tgl 1221 GIC 1858 : slot_category[i] = current_category;
5366 tgl 1222 CBC 1858 : slot_has_preferred_type[i] = current_is_preferred;
8811 lockhart 1223 ECB : }
1224 : else
1225 : {
1226 : /*
1227 : * Remember conflict, but keep going (might find STRING)
1228 : */
8150 tgl 1229 GIC 8448 : have_conflict = true;
8449 tgl 1230 ECB : }
1231 : }
1232 : }
5366 tgl 1233 GIC 5857 : if (have_conflict && slot_category[i] != TYPCATEGORY_STRING)
8150 tgl 1234 ECB : {
1235 : /* Failed to resolve category conflict at this position */
8150 tgl 1236 UIC 0 : resolved_unknowns = false;
8150 tgl 1237 UBC 0 : break;
8150 tgl 1238 EUB : }
1239 : }
1240 :
8150 tgl 1241 GIC 3926 : if (resolved_unknowns)
8150 tgl 1242 ECB : {
1243 : /* Strip non-matching candidates */
8150 tgl 1244 GIC 3926 : ncandidates = 0;
4161 tgl 1245 CBC 3926 : first_candidate = candidates;
8150 1246 3926 : last_candidate = NULL;
1247 3926 : for (current_candidate = candidates;
1248 15687 : current_candidate != NULL;
1249 11761 : current_candidate = current_candidate->next)
8150 tgl 1250 ECB : {
8053 bruce 1251 GIC 11761 : bool keepit = true;
8150 tgl 1252 ECB :
8150 tgl 1253 GIC 11761 : current_typeids = current_candidate->args;
8150 tgl 1254 CBC 23621 : for (i = 0; i < nargs; i++)
8150 tgl 1255 ECB : {
7258 tgl 1256 GIC 19640 : if (input_base_typeids[i] != UNKNOWNOID)
8150 tgl 1257 CBC 4808 : continue;
1258 14832 : current_type = current_typeids[i];
5366 1259 14832 : get_type_category_preferred(current_type,
5366 tgl 1260 ECB : ¤t_category,
1261 : ¤t_is_preferred);
8150 tgl 1262 GIC 14832 : if (current_category != slot_category[i])
8811 lockhart 1263 ECB : {
8150 tgl 1264 GIC 6810 : keepit = false;
8150 tgl 1265 CBC 6810 : break;
8449 tgl 1266 ECB : }
5366 tgl 1267 GIC 8022 : if (slot_has_preferred_type[i] && !current_is_preferred)
8449 tgl 1268 ECB : {
8150 tgl 1269 GIC 970 : keepit = false;
8150 tgl 1270 CBC 970 : break;
9101 lockhart 1271 ECB : }
1272 : }
8150 tgl 1273 GIC 11761 : if (keepit)
8150 tgl 1274 ECB : {
1275 : /* keep this candidate */
8150 tgl 1276 GIC 3981 : last_candidate = current_candidate;
8150 tgl 1277 CBC 3981 : ncandidates++;
8150 tgl 1278 ECB : }
1279 : else
1280 : {
1281 : /* forget this candidate */
8150 tgl 1282 GIC 7780 : if (last_candidate)
8150 tgl 1283 CBC 5097 : last_candidate->next = current_candidate->next;
8150 tgl 1284 ECB : else
4161 tgl 1285 GIC 2683 : first_candidate = current_candidate->next;
8150 tgl 1286 ECB : }
1287 : }
1288 :
1289 : /* if we found any matches, restrict our attention to those */
4161 tgl 1290 GIC 3926 : if (last_candidate)
4161 tgl 1291 ECB : {
4161 tgl 1292 GIC 3926 : candidates = first_candidate;
4161 tgl 1293 ECB : /* terminate rebuilt list */
8150 tgl 1294 GIC 3926 : last_candidate->next = NULL;
4161 tgl 1295 ECB : }
1296 :
4161 tgl 1297 GIC 3926 : if (ncandidates == 1)
4161 tgl 1298 CBC 3901 : return candidates;
9101 lockhart 1299 ECB : }
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 : */
4161 tgl 1311 GIC 25 : if (nunknowns < nargs)
4161 tgl 1312 ECB : {
4161 tgl 1313 GIC 25 : Oid known_type = UNKNOWNOID;
4161 tgl 1314 ECB :
4161 tgl 1315 GIC 75 : for (i = 0; i < nargs; i++)
4161 tgl 1316 ECB : {
4161 tgl 1317 GIC 50 : if (input_base_typeids[i] == UNKNOWNOID)
4161 tgl 1318 CBC 25 : continue;
2118 1319 25 : if (known_type == UNKNOWNOID) /* first known arg? */
4161 1320 25 : known_type = input_base_typeids[i];
4161 tgl 1321 LBC 0 : else if (known_type != input_base_typeids[i])
4161 tgl 1322 EUB : {
1323 : /* oops, not all match */
4161 tgl 1324 UIC 0 : known_type = UNKNOWNOID;
4161 tgl 1325 UBC 0 : break;
4161 tgl 1326 EUB : }
1327 : }
1328 :
4161 tgl 1329 GIC 25 : if (known_type != UNKNOWNOID)
4161 tgl 1330 ECB : {
1331 : /* okay, just one known type, apply the heuristic */
4161 tgl 1332 GIC 75 : for (i = 0; i < nargs; i++)
4161 tgl 1333 CBC 50 : input_base_typeids[i] = known_type;
1334 25 : ncandidates = 0;
1335 25 : last_candidate = NULL;
1336 25 : for (current_candidate = candidates;
1337 105 : current_candidate != NULL;
1338 80 : current_candidate = current_candidate->next)
4161 tgl 1339 ECB : {
4161 tgl 1340 GIC 80 : current_typeids = current_candidate->args;
4161 tgl 1341 CBC 80 : if (can_coerce_type(nargs, input_base_typeids, current_typeids,
4161 tgl 1342 ECB : COERCION_IMPLICIT))
1343 : {
4161 tgl 1344 GIC 25 : if (++ncandidates > 1)
4161 tgl 1345 LBC 0 : break; /* not unique, give up */
4161 tgl 1346 GBC 25 : last_candidate = current_candidate;
4161 tgl 1347 ECB : }
1348 : }
4161 tgl 1349 GIC 25 : if (ncandidates == 1)
4161 tgl 1350 ECB : {
1351 : /* successfully identified a unique match */
4161 tgl 1352 GIC 25 : last_candidate->next = NULL;
4161 tgl 1353 CBC 25 : return last_candidate;
4161 tgl 1354 ECB : }
1355 : }
1356 : }
1357 :
7258 tgl 1358 UIC 0 : return NULL; /* failed to select a best candidate */
2118 tgl 1359 EUB : } /* 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
7670 tgl 1394 GIC 325376 : func_get_detail(List *funcname,
7857 tgl 1395 ECB : 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 */
5098 tgl 1414 GIC 325376 : *funcid = InvalidOid;
5098 tgl 1415 CBC 325376 : *rettype = InvalidOid;
1416 325376 : *retset = false;
1417 325376 : *nvargs = 0;
3293 1418 325376 : *vatype = InvalidOid;
5098 1419 325376 : *true_typeids = NULL;
1420 325376 : if (argdefaults)
5050 bruce 1421 319676 : *argdefaults = NIL;
5098 tgl 1422 ECB :
1423 : /* Get list of possible candidates from namespace search */
4931 tgl 1424 GIC 325376 : raw_candidates = FuncnameGetCandidates(funcname, nargs, fargnames,
3363 alvherre 1425 ECB : 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 : */
7258 tgl 1432 GIC 325376 : for (best_candidate = raw_candidates;
7673 tgl 1433 CBC 621968 : best_candidate != NULL;
1434 296592 : best_candidate = best_candidate->next)
9266 bruce 1435 ECB : {
1436 : /* if nargs==0, argtypes can be null; don't pass that to memcmp */
1244 tgl 1437 GIC 501617 : if (nargs == 0 ||
1244 tgl 1438 CBC 431545 : memcmp(argtypes, best_candidate->args, nargs * sizeof(Oid)) == 0)
7673 tgl 1439 ECB : break;
1440 : }
1441 :
7673 tgl 1442 GIC 325376 : if (best_candidate == NULL)
8421 tgl 1443 ECB : {
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 : */
4931 tgl 1483 GIC 120351 : if (nargs == 1 && fargs != NIL && fargnames == NIL)
7857 tgl 1484 ECB : {
5628 tgl 1485 GIC 39513 : Oid targetType = FuncNameAsType(funcname);
7857 tgl 1486 ECB :
5628 tgl 1487 GIC 39513 : if (OidIsValid(targetType))
7857 tgl 1488 ECB : {
7857 tgl 1489 GIC 330 : Oid sourceType = argtypes[0];
6892 neilc 1490 CBC 330 : Node *arg1 = linitial(fargs);
5787 tgl 1491 ECB : bool iscoercion;
1492 :
5787 tgl 1493 GIC 330 : if (sourceType == UNKNOWNOID && IsA(arg1, Const))
5787 tgl 1494 ECB : {
1495 : /* always treat typename('literal') as coercion */
5787 tgl 1496 GIC 224 : iscoercion = true;
5787 tgl 1497 ECB : }
1498 : else
1499 : {
1500 : CoercionPathType cpathtype;
1501 : Oid cfuncid;
1502 :
5787 tgl 1503 GIC 106 : cpathtype = find_coercion_pathway(targetType, sourceType,
5787 tgl 1504 ECB : COERCION_EXPLICIT,
1505 : &cfuncid);
4536 tgl 1506 GIC 106 : switch (cpathtype)
4536 tgl 1507 ECB : {
4536 tgl 1508 GIC 4 : case COERCION_PATH_RELABELTYPE:
4536 tgl 1509 CBC 4 : iscoercion = true;
1510 4 : break;
1511 85 : case COERCION_PATH_COERCEVIAIO:
1512 164 : if ((sourceType == RECORDOID ||
1513 160 : ISCOMPLEX(sourceType)) &&
2118 1514 81 : TypeCategory(targetType) == TYPCATEGORY_STRING)
4536 1515 81 : iscoercion = false;
4536 tgl 1516 ECB : else
4536 tgl 1517 GIC 4 : iscoercion = true;
4536 tgl 1518 CBC 85 : break;
1519 17 : default:
1520 17 : iscoercion = false;
1521 17 : break;
4536 tgl 1522 ECB : }
1523 : }
1524 :
5787 tgl 1525 GIC 330 : if (iscoercion)
7857 tgl 1526 ECB : {
1527 : /* Treat it as a type coercion */
7857 tgl 1528 GIC 232 : *funcid = InvalidOid;
7857 tgl 1529 CBC 232 : *rettype = targetType;
1530 232 : *retset = false;
5380 1531 232 : *nvargs = 0;
3293 1532 232 : *vatype = InvalidOid;
7857 1533 232 : *true_typeids = argtypes;
1534 232 : return FUNCDETAIL_COERCION;
7857 tgl 1535 ECB : }
1536 : }
1537 : }
1538 :
1539 : /*
1540 : * didn't find an exact match, so now try to match up candidates...
1541 : */
7258 tgl 1542 GIC 120119 : if (raw_candidates != NULL)
9266 bruce 1543 ECB : {
1544 : FuncCandidateList current_candidates;
1545 : int ncandidates;
1546 :
6560 tgl 1547 GIC 119486 : ncandidates = func_match_argtypes(nargs,
6560 tgl 1548 ECB : argtypes,
1549 : raw_candidates,
1550 : ¤t_candidates);
1551 :
1552 : /* one match only? then run with it... */
6560 tgl 1553 GIC 119486 : if (ncandidates == 1)
6560 tgl 1554 CBC 115717 : best_candidate = current_candidates;
9266 bruce 1555 ECB :
1556 : /*
1557 : * multiple candidates? then better decide or throw an error...
1558 : */
6560 tgl 1559 GIC 3769 : else if (ncandidates > 1)
9266 bruce 1560 ECB : {
6560 tgl 1561 GIC 3516 : best_candidate = func_select_candidate(nargs,
6560 tgl 1562 ECB : 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 : */
6560 tgl 1569 GIC 3516 : if (!best_candidate)
7219 tgl 1570 LBC 0 : return FUNCDETAIL_MULTIPLE;
9266 bruce 1571 EUB : }
1572 : }
1573 : }
1574 :
7673 tgl 1575 GIC 325144 : if (best_candidate)
9266 bruce 1576 ECB : {
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 : */
5225 tgl 1586 GIC 324258 : if (!OidIsValid(best_candidate->oid))
5225 tgl 1587 CBC 15 : return FUNCDETAIL_MULTIPLE;
5225 tgl 1588 ECB :
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 : */
4931 tgl 1594 GIC 324243 : if (fargnames != NIL && !expand_variadic && nargs > 0 &&
4931 tgl 1595 LBC 0 : best_candidate->argnumbers[nargs - 1] != nargs - 1)
4931 tgl 1596 UBC 0 : return FUNCDETAIL_NOTFOUND;
4931 tgl 1597 EUB :
7673 tgl 1598 GIC 324243 : *funcid = best_candidate->oid;
5380 tgl 1599 CBC 324243 : *nvargs = best_candidate->nvargs;
7673 1600 324243 : *true_typeids = best_candidate->args;
7673 tgl 1601 ECB :
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 : */
4931 tgl 1607 GIC 324243 : if (best_candidate->argnumbers != NULL)
4931 tgl 1608 ECB : {
4931 tgl 1609 GIC 5928 : int i = 0;
4931 tgl 1610 ECB : ListCell *lc;
1611 :
4931 tgl 1612 GIC 23927 : foreach(lc, fargs)
4931 tgl 1613 ECB : {
4931 tgl 1614 GIC 17999 : NamedArgExpr *na = (NamedArgExpr *) lfirst(lc);
4931 tgl 1615 ECB :
4931 tgl 1616 GIC 17999 : if (IsA(na, NamedArgExpr))
4931 tgl 1617 CBC 17272 : na->argnumber = best_candidate->argnumbers[i];
1618 17999 : i++;
4931 tgl 1619 ECB : }
1620 : }
1621 :
4802 rhaas 1622 GIC 324243 : ftup = SearchSysCache1(PROCOID,
4802 rhaas 1623 ECB : ObjectIdGetDatum(best_candidate->oid));
7522 bruce 1624 GIC 324243 : if (!HeapTupleIsValid(ftup)) /* should not happen */
7205 tgl 1625 LBC 0 : elog(ERROR, "cache lookup failed for function %u",
7219 tgl 1626 EUB : best_candidate->oid);
7673 tgl 1627 GIC 324243 : pform = (Form_pg_proc) GETSTRUCT(ftup);
9266 bruce 1628 CBC 324243 : *rettype = pform->prorettype;
1629 324243 : *retset = pform->proretset;
3552 andrew 1630 324243 : *vatype = pform->provariadic;
5225 tgl 1631 ECB : /* fetch default args if caller wants 'em */
4931 tgl 1632 GIC 324243 : if (argdefaults && best_candidate->ndargs > 0)
5225 tgl 1633 ECB : {
1634 : Datum proargdefaults;
1635 : char *str;
1636 : List *defaults;
1637 :
1638 : /* shouldn't happen, FuncnameGetCandidates messed up */
4931 tgl 1639 CBC 4658 : if (best_candidate->ndargs > pform->pronargdefaults)
4931 tgl 1640 UBC 0 : elog(ERROR, "not enough default arguments");
1641 :
15 dgustafsson 1642 GNC 4658 : proargdefaults = SysCacheGetAttrNotNull(PROCOID, ftup,
1643 : Anum_pg_proc_proargdefaults);
4931 tgl 1644 CBC 4658 : str = TextDatumGetCString(proargdefaults);
2238 peter_e 1645 GIC 4658 : defaults = castNode(List, stringToNode(str));
4931 tgl 1646 4658 : pfree(str);
4931 tgl 1647 ECB :
1648 : /* Delete any unused defaults from the returned list */
4931 tgl 1649 GIC 4658 : 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;
4790 bruce 1663 ECB : int i;
4931 tgl 1664 :
4931 tgl 1665 CBC 2777 : defargnumbers = NULL;
1666 2777 : firstdefarg = &best_candidate->argnumbers[best_candidate->nargs - best_candidate->ndargs];
1667 8235 : for (i = 0; i < best_candidate->ndargs; i++)
1668 5458 : defargnumbers = bms_add_member(defargnumbers,
1669 5458 : firstdefarg[i]);
1670 2777 : newdefaults = NIL;
668 tgl 1671 GIC 2777 : i = best_candidate->nominalnargs - pform->pronargdefaults;
4931 tgl 1672 CBC 15923 : foreach(lc, defaults)
4931 tgl 1673 ECB : {
4931 tgl 1674 CBC 13146 : if (bms_is_member(i, defargnumbers))
4931 tgl 1675 GIC 5458 : newdefaults = lappend(newdefaults, lfirst(lc));
4931 tgl 1676 CBC 13146 : i++;
4931 tgl 1677 ECB : }
4931 tgl 1678 CBC 2777 : Assert(list_length(newdefaults) == best_candidate->ndargs);
4931 tgl 1679 GIC 2777 : bms_free(defargnumbers);
1680 2777 : *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 : */
5225 tgl 1688 ECB : int ndelete;
1689 :
5225 tgl 1690 CBC 1881 : ndelete = list_length(defaults) - best_candidate->ndargs;
1364 1691 1881 : if (ndelete > 0)
523 tgl 1692 GIC 95 : defaults = list_delete_first_n(defaults, ndelete);
5225 1693 1881 : *argdefaults = defaults;
1694 : }
5225 tgl 1695 ECB : }
1696 :
1864 peter_e 1697 CBC 324243 : switch (pform->prokind)
1864 peter_e 1698 ECB : {
1864 peter_e 1699 CBC 24138 : case PROKIND_AGGREGATE:
1700 24138 : result = FUNCDETAIL_AGGREGATE;
1701 24138 : break;
1702 298850 : case PROKIND_FUNCTION:
1703 298850 : result = FUNCDETAIL_NORMAL;
1704 298850 : break;
1705 196 : case PROKIND_PROCEDURE:
1706 196 : result = FUNCDETAIL_PROCEDURE;
1707 196 : break;
1708 1059 : case PROKIND_WINDOW:
1864 peter_e 1709 GBC 1059 : result = FUNCDETAIL_WINDOWFUNC;
1710 1059 : break;
1864 peter_e 1711 UIC 0 : default:
1712 0 : elog(ERROR, "unrecognized prokind: %c", pform->prokind);
1713 : result = FUNCDETAIL_NORMAL; /* keep compiler quiet */
1714 : break;
1864 peter_e 1715 ECB : }
1716 :
8179 tgl 1717 GIC 324243 : ReleaseSysCache(ftup);
7668 1718 324243 : return result;
9266 bruce 1719 ECB : }
1720 :
7857 tgl 1721 GIC 886 : 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.
3394 tgl 1738 ECB : */
1739 : static void
3394 tgl 1740 GIC 72 : 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;
1358 tgl 1748 ECB : int hargpos;
3394 1749 :
3394 tgl 1750 GIC 72 : numDirectArgs = list_length(fargs) - numAggregatedArgs;
3394 tgl 1751 CBC 72 : numNonHypotheticalArgs = numDirectArgs - numAggregatedArgs;
3394 tgl 1752 EUB : /* safety check (should only trigger with a misdeclared agg) */
3394 tgl 1753 GIC 72 : if (numNonHypotheticalArgs < 0)
3394 tgl 1754 UIC 0 : elog(ERROR, "incorrect number of arguments to hypothetical-set aggregate");
3394 tgl 1755 ECB :
1756 : /* Check each hypothetical arg and corresponding aggregated arg */
1358 tgl 1757 CBC 165 : for (hargpos = numNonHypotheticalArgs; hargpos < numDirectArgs; hargpos++)
3394 tgl 1758 ECB : {
1358 tgl 1759 CBC 99 : int aargpos = numDirectArgs + (hargpos - numNonHypotheticalArgs);
1358 tgl 1760 GIC 99 : ListCell *harg = list_nth_cell(fargs, hargpos);
1761 99 : ListCell *aarg = list_nth_cell(fargs, aargpos);
1762 : Oid commontype;
1763 : int32 commontypmod;
3394 tgl 1764 ECB :
3394 tgl 1765 EUB : /* A mismatch means AggregateCreate didn't check properly ... */
1358 tgl 1766 GIC 99 : if (declared_arg_types[hargpos] != declared_arg_types[aargpos])
3394 tgl 1767 UIC 0 : elog(ERROR, "hypothetical-set aggregate has inconsistent declared argument types");
3394 tgl 1768 ECB :
3394 tgl 1769 EUB : /* No need to unify if make_fn_arguments will coerce */
1358 tgl 1770 GIC 99 : if (declared_arg_types[hargpos] != ANYOID)
3394 tgl 1771 UIC 0 : 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
3394 tgl 1776 ECB : * the aggregated values).
1777 : */
3394 tgl 1778 GIC 99 : commontype = select_common_type(pstate,
1358 1779 99 : list_make2(lfirst(aarg), lfirst(harg)),
3394 tgl 1780 ECB : "WITHIN GROUP",
1781 : NULL);
894 peter 1782 GIC 96 : commontypmod = select_common_typmod(pstate,
1783 96 : list_make2(lfirst(aarg), lfirst(harg)),
1784 : commontype);
1785 :
1786 : /*
1787 : * Perform the coercions. We don't need to worry about NamedArgExprs
3394 tgl 1788 ECB : * here because they aren't supported with aggregates.
1789 : */
1358 tgl 1790 CBC 189 : lfirst(harg) = coerce_type(pstate,
1358 tgl 1791 GIC 96 : (Node *) lfirst(harg),
1792 96 : actual_arg_types[hargpos],
1793 : commontype, commontypmod,
1794 : COERCION_IMPLICIT,
1358 tgl 1795 ECB : COERCE_IMPLICIT_CAST,
1796 : -1);
1358 tgl 1797 CBC 93 : actual_arg_types[hargpos] = commontype;
1798 186 : lfirst(aarg) = coerce_type(pstate,
1358 tgl 1799 GIC 93 : (Node *) lfirst(aarg),
1800 93 : actual_arg_types[aargpos],
1801 : commontype, commontypmod,
1802 : COERCION_IMPLICIT,
1358 tgl 1803 ECB : COERCE_IMPLICIT_CAST,
1804 : -1);
3394 tgl 1805 CBC 93 : actual_arg_types[aargpos] = commontype;
1806 : }
3394 tgl 1807 GIC 66 : }
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.
9266 bruce 1822 ECB : */
1823 : void
7285 tgl 1824 GIC 809232 : make_fn_arguments(ParseState *pstate,
1825 : List *fargs,
1826 : Oid *actual_arg_types,
1827 : Oid *declared_arg_types)
9266 bruce 1828 ECB : {
1829 : ListCell *current_fargs;
7306 tgl 1830 CBC 809232 : int i = 0;
1831 :
7306 tgl 1832 GIC 2217346 : foreach(current_fargs, fargs)
9266 bruce 1833 ECB : {
1834 : /* types don't match? then force coercion using a function call... */
7306 tgl 1835 CBC 1408122 : if (actual_arg_types[i] != declared_arg_types[i])
1836 : {
4790 bruce 1837 GIC 334889 : Node *node = (Node *) lfirst(current_fargs);
1838 :
1839 : /*
1840 : * If arg is a NamedArgExpr, coerce its input expr instead --- we
4790 bruce 1841 ECB : * want the NamedArgExpr to stay at the top level of the list.
1842 : */
4931 tgl 1843 CBC 334889 : if (IsA(node, NamedArgExpr))
1844 : {
1845 8707 : NamedArgExpr *na = (NamedArgExpr *) node;
4931 tgl 1846 ECB :
4931 tgl 1847 CBC 8707 : node = coerce_type(pstate,
1848 8707 : (Node *) na->arg,
4931 tgl 1849 GIC 8707 : actual_arg_types[i],
1850 8707 : declared_arg_types[i], -1,
1851 : COERCION_IMPLICIT,
4931 tgl 1852 ECB : COERCE_IMPLICIT_CAST,
1853 : -1);
4931 tgl 1854 GIC 8707 : na->arg = (Expr *) node;
1855 : }
4931 tgl 1856 ECB : else
1857 : {
4931 tgl 1858 CBC 326182 : node = coerce_type(pstate,
4931 tgl 1859 ECB : node,
4931 tgl 1860 GIC 326182 : actual_arg_types[i],
1861 326182 : declared_arg_types[i], -1,
1862 : COERCION_IMPLICIT,
4931 tgl 1863 ECB : COERCE_IMPLICIT_CAST,
1864 : -1);
4931 tgl 1865 GIC 326174 : lfirst(current_fargs) = node;
4931 tgl 1866 ECB : }
1867 : }
7306 tgl 1868 CBC 1408114 : i++;
1869 : }
9266 bruce 1870 GIC 809224 : }
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.
5628 tgl 1878 ECB : */
1879 : static Oid
5628 tgl 1880 GIC 39513 : FuncNameAsType(List *funcname)
1881 : {
1882 : Oid result;
1883 : Type typtup;
1884 :
1885 : /*
1886 : * temp_ok=false protects the <refsect1 id="sql-createfunction-security">
1343 noah 1887 ECB : * contract for writing SECURITY DEFINER functions safely.
1888 : */
1343 noah 1889 CBC 39513 : typtup = LookupTypeNameExtended(NULL, makeTypeNameFromNameList(funcname),
1343 noah 1890 ECB : NULL, false, false);
5628 tgl 1891 GIC 39513 : if (typtup == NULL)
5628 tgl 1892 CBC 39177 : return InvalidOid;
5628 tgl 1893 ECB :
5628 tgl 1894 CBC 672 : if (((Form_pg_type) GETSTRUCT(typtup))->typisdefined &&
5628 tgl 1895 GIC 336 : !OidIsValid(typeTypeRelid(typtup)))
5628 tgl 1896 CBC 330 : result = typeTypeId(typtup);
1897 : else
1898 6 : result = InvalidOid;
5628 tgl 1899 ECB :
5628 tgl 1900 GIC 336 : ReleaseSysCache(typtup);
1901 336 : 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.
9266 bruce 1909 ECB : */
1910 : static Node *
1986 peter_e 1911 GIC 32823 : 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
6385 bruce 1925 ECB : * efficient to do it this way when possible.
7689 tgl 1926 : */
6946 tgl 1927 GIC 32823 : if (IsA(first_arg, Var) &&
1928 28074 : ((Var *) first_arg)->varattno == InvalidAttrNumber)
1929 : {
1200 tgl 1930 ECB : ParseNamespaceItem *nsitem;
1931 :
1200 tgl 1932 CBC 84 : nsitem = GetNSItemByRangeTablePosn(pstate,
1933 : ((Var *) first_arg)->varno,
1934 84 : ((Var *) first_arg)->varlevelsup);
6946 tgl 1935 ECB : /* Return a Var if funcname matches a column, else NULL */
1200 tgl 1936 GIC 84 : return scanNSItemForColumn(pstate, nsitem,
1937 84 : ((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.
6347 bruce 1946 ECB : * That task is handled by expandRecordVariable().
6946 tgl 1947 : */
6522 tgl 1948 CBC 32739 : if (IsA(first_arg, Var) &&
6522 tgl 1949 GIC 27990 : ((Var *) first_arg)->vartype == RECORDOID)
6522 tgl 1950 CBC 5787 : tupdesc = expandRecordVariable(pstate, (Var *) first_arg, 0);
1991 tgl 1951 ECB : else
1991 tgl 1952 CBC 26952 : tupdesc = get_expr_result_tupdesc(first_arg, true);
1991 tgl 1953 GIC 32739 : if (!tupdesc)
6583 tgl 1954 CBC 1 : return NULL; /* unresolvable RECORD type */
1955 :
1956 415130 : for (i = 0; i < tupdesc->natts; i++)
1957 : {
2058 andres 1958 415100 : Form_pg_attribute att = TupleDescAttr(tupdesc, i);
6583 tgl 1959 ECB :
6583 tgl 1960 GIC 415100 : if (strcmp(funcname, NameStr(att->attname)) == 0 &&
1961 32708 : !att->attisdropped)
6583 tgl 1962 ECB : {
1963 : /* Success, so generate a FieldSelect expression */
6583 tgl 1964 CBC 32708 : FieldSelect *fselect = makeNode(FieldSelect);
6583 tgl 1965 ECB :
6583 tgl 1966 CBC 32708 : fselect->arg = (Expr *) first_arg;
1967 32708 : fselect->fieldnum = i + 1;
6583 tgl 1968 GIC 32708 : fselect->resulttype = att->atttypid;
6583 tgl 1969 CBC 32708 : fselect->resulttypmod = att->atttypmod;
4383 tgl 1970 ECB : /* save attribute's collation for parse_collate.c */
4404 tgl 1971 GIC 32708 : fselect->resultcollid = att->attcollation;
6583 1972 32708 : return (Node *) fselect;
1973 : }
6583 tgl 1974 ECB : }
1975 :
6583 tgl 1976 GIC 30 : 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.
9266 bruce 1990 ECB : */
1991 : const char *
4931 tgl 1992 GIC 396 : funcname_signature_string(const char *funcname, int nargs,
1993 : List *argnames, const Oid *argtypes)
1994 : {
1995 : StringInfoData argbuf;
1996 : int numposargs;
1997 : ListCell *lc;
9266 bruce 1998 ECB : int i;
1999 :
7632 tgl 2000 CBC 396 : initStringInfo(&argbuf);
2001 :
7203 2002 396 : appendStringInfo(&argbuf, "%s(", funcname);
7219 tgl 2003 ECB :
4931 tgl 2004 GIC 396 : numposargs = nargs - list_length(argnames);
4931 tgl 2005 CBC 396 : lc = list_head(argnames);
2006 :
9266 bruce 2007 997 : for (i = 0; i < nargs; i++)
9266 bruce 2008 ECB : {
9266 bruce 2009 CBC 601 : if (i)
7290 tgl 2010 GIC 270 : appendStringInfoString(&argbuf, ", ");
4931 tgl 2011 CBC 601 : if (i >= numposargs)
4931 tgl 2012 ECB : {
2900 rhaas 2013 GIC 24 : appendStringInfo(&argbuf, "%s => ", (char *) lfirst(lc));
1364 tgl 2014 CBC 24 : lc = lnext(argnames, lc);
2015 : }
4697 tgl 2016 GIC 601 : appendStringInfoString(&argbuf, format_type_be(argtypes[i]));
9266 bruce 2017 ECB : }
2018 :
7219 tgl 2019 CBC 396 : appendStringInfoChar(&argbuf, ')');
2020 :
7219 tgl 2021 GIC 396 : 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.
7203 tgl 2027 ECB : */
2028 : const char *
4931 tgl 2029 GIC 384 : func_signature_string(List *funcname, int nargs,
4931 tgl 2030 ECB : List *argnames, const Oid *argtypes)
2031 : {
7203 tgl 2032 GIC 384 : 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.
7670 tgl 2046 ECB : */
2047 : static Oid
668 tgl 2048 GIC 37398 : LookupFuncNameInternal(ObjectType objtype, List *funcname,
2049 : int nargs, const Oid *argtypes,
2050 : bool include_out_arguments, bool missing_ok,
668 tgl 2051 ECB : FuncLookupError *lookupError)
2052 : {
668 tgl 2053 GIC 37398 : Oid result = InvalidOid;
2054 : FuncCandidateList clist;
7670 tgl 2055 ECB :
2056 : /* NULL argtypes allowed for nullary functions only */
1244 alvherre 2057 GIC 37398 : Assert(argtypes != NULL || nargs == 0);
2843 tgl 2058 ECB :
2059 : /* Always set *lookupError, to forestall uninitialized-variable warnings */
1480 tgl 2060 GIC 37398 : *lookupError = FUNCLOOKUP_NOSUCHFUNC;
1480 tgl 2061 ECB :
2062 : /* Get list of candidate objects */
1480 tgl 2063 GIC 37398 : clist = FuncnameGetCandidates(funcname, nargs, NIL, false, false,
2064 : include_out_arguments, missing_ok);
7670 tgl 2065 ECB :
2066 : /* Scan list for a match to the arg types (if specified) and the objtype */
668 tgl 2067 GIC 78599 : for (; clist != NULL; clist = clist->next)
2222 peter_e 2068 ECB : {
2069 : /* Check arg type match, if specified */
668 tgl 2070 GIC 41243 : if (nargs >= 0)
2222 peter_e 2071 ECB : {
668 tgl 2072 : /* if nargs==0, argtypes can be null; don't pass that to memcmp */
668 tgl 2073 CBC 41072 : if (nargs > 0 &&
668 tgl 2074 GIC 23714 : memcmp(argtypes, clist->args, nargs * sizeof(Oid)) != 0)
2075 4818 : continue;
2076 : }
668 tgl 2077 ECB :
2078 : /* Check for duplicates reported by FuncnameGetCandidates */
668 tgl 2079 CBC 36425 : if (!OidIsValid(clist->oid))
668 tgl 2080 ECB : {
668 tgl 2081 GIC 3 : *lookupError = FUNCLOOKUP_AMBIGUOUS;
1480 2082 3 : return InvalidOid;
2083 : }
2222 peter_e 2084 ECB :
2085 : /* Check objtype match, if specified */
668 tgl 2086 CBC 36422 : switch (objtype)
2087 : {
668 tgl 2088 GIC 10819 : case OBJECT_FUNCTION:
668 tgl 2089 ECB : case OBJECT_AGGREGATE:
668 tgl 2090 EUB : /* Ignore procedures */
668 tgl 2091 CBC 10819 : if (get_func_prokind(clist->oid) == PROKIND_PROCEDURE)
668 tgl 2092 LBC 0 : continue;
668 tgl 2093 GIC 10819 : break;
668 tgl 2094 CBC 87 : case OBJECT_PROCEDURE:
668 tgl 2095 ECB : /* Ignore non-procedures */
668 tgl 2096 CBC 87 : if (get_func_prokind(clist->oid) != PROKIND_PROCEDURE)
2097 6 : continue;
668 tgl 2098 GIC 81 : break;
668 tgl 2099 CBC 25516 : case OBJECT_ROUTINE:
668 tgl 2100 EUB : /* no restriction */
668 tgl 2101 GBC 25516 : break;
668 tgl 2102 UIC 0 : default:
2103 0 : Assert(false);
2104 : }
668 tgl 2105 ECB :
2106 : /* Check for multiple matches */
668 tgl 2107 CBC 36416 : if (OidIsValid(result))
668 tgl 2108 ECB : {
668 tgl 2109 GIC 21 : *lookupError = FUNCLOOKUP_AMBIGUOUS;
2110 21 : return InvalidOid;
2111 : }
668 tgl 2112 ECB :
2113 : /* OK, we have a candidate */
668 tgl 2114 GIC 36395 : result = clist->oid;
7670 tgl 2115 ECB : }
2116 :
668 tgl 2117 GIC 37356 : 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.)
1480 tgl 2141 ECB : */
2142 : Oid
1480 tgl 2143 GIC 11560 : LookupFuncName(List *funcname, int nargs, const Oid *argtypes, bool missing_ok)
2144 : {
2145 : Oid funcoid;
1480 tgl 2146 ECB : FuncLookupError lookupError;
2147 :
668 tgl 2148 GIC 11560 : funcoid = LookupFuncNameInternal(OBJECT_FUNCTION,
2149 : funcname, nargs, argtypes,
2150 : false, missing_ok,
1480 tgl 2151 ECB : &lookupError);
2152 :
1480 tgl 2153 GIC 11560 : if (OidIsValid(funcoid))
1480 tgl 2154 CBC 10702 : return funcoid;
2155 :
2156 858 : switch (lookupError)
2157 : {
2158 858 : case FUNCLOOKUP_NOSUCHFUNC:
1480 tgl 2159 ECB : /* Let the caller deal with it when missing_ok is true */
1480 tgl 2160 GIC 858 : if (missing_ok)
1480 tgl 2161 CBC 838 : return InvalidOid;
1480 tgl 2162 EUB :
1480 tgl 2163 GIC 20 : if (nargs < 0)
1480 tgl 2164 UIC 0 : ereport(ERROR,
2165 : (errcode(ERRCODE_UNDEFINED_FUNCTION),
2166 : errmsg("could not find a function named \"%s\"",
1480 tgl 2167 ECB : NameListToString(funcname))));
2168 : else
1480 tgl 2169 GIC 20 : ereport(ERROR,
2170 : (errcode(ERRCODE_UNDEFINED_FUNCTION),
2171 : errmsg("function %s does not exist",
2172 : func_signature_string(funcname, nargs,
2173 : NIL, argtypes))));
1480 tgl 2174 EUB : break;
2175 :
1480 tgl 2176 UBC 0 : case FUNCLOOKUP_AMBIGUOUS:
2177 : /* Raise an error regardless of missing_ok */
1480 tgl 2178 UIC 0 : 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;
1480 tgl 2184 EUB : }
2185 :
1480 tgl 2186 UIC 0 : 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.
7670 tgl 2203 ECB : */
2204 : Oid
1480 tgl 2205 GIC 25795 : 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;
1480 tgl 2213 ECB : FuncLookupError lookupError;
2214 :
1956 peter_e 2215 GIC 25795 : Assert(objtype == OBJECT_AGGREGATE ||
2216 : objtype == OBJECT_FUNCTION ||
2217 : objtype == OBJECT_PROCEDURE ||
1956 peter_e 2218 ECB : objtype == OBJECT_ROUTINE);
7670 tgl 2219 :
2293 peter_e 2220 GIC 25795 : argcount = list_length(func->objargs);
7670 tgl 2221 GBC 25795 : if (argcount > FUNC_MAX_ARGS)
1480 tgl 2222 EUB : {
1480 tgl 2223 UIC 0 : if (objtype == OBJECT_PROCEDURE)
2224 0 : 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,
1480 tgl 2229 EUB : FUNC_MAX_ARGS)));
2230 : else
1480 tgl 2231 UIC 0 : 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
668 tgl 2241 ECB : * Postgres rules).
2242 : */
1501 tgl 2243 GIC 25795 : i = 0;
1501 tgl 2244 CBC 50666 : foreach(args_item, func->objargs)
2245 : {
668 2246 24886 : TypeName *t = lfirst_node(TypeName, args_item);
7670 tgl 2247 ECB :
1480 tgl 2248 CBC 24886 : argoids[i] = LookupTypeNameOid(NULL, t, missing_ok);
2249 24883 : if (!OidIsValid(argoids[i]))
1480 tgl 2250 GIC 12 : return InvalidOid; /* missing_ok must be true */
2251 24871 : i++;
2252 : }
2253 :
2254 : /*
2255 : * Set nargs for LookupFuncNameInternal. It expects -1 to mean no args
1480 tgl 2256 ECB : * were specified.
2257 : */
1480 tgl 2258 GIC 25780 : 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
668 tgl 2267 ECB : * this choice.)
2268 : */
668 tgl 2269 GIC 25780 : 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
668 tgl 2280 ECB : * to perform this lookup.)
2281 : */
668 tgl 2282 CBC 25762 : if ((objtype == OBJECT_PROCEDURE || objtype == OBJECT_ROUTINE) &&
668 tgl 2283 GIC 151 : func->objfuncargs != NIL &&
668 tgl 2284 CBC 73 : lookupError != FUNCLOOKUP_AMBIGUOUS)
2285 : {
668 tgl 2286 GIC 73 : 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
668 tgl 2294 ECB : * hack in FUNCTION or AGGREGATE mode.)
2295 : */
668 tgl 2296 CBC 149 : foreach(args_item, func->objfuncargs)
2297 : {
2298 91 : FunctionParameter *fp = lfirst_node(FunctionParameter, args_item);
2299 :
2300 91 : if (fp->mode != FUNC_PARAM_DEFAULT)
668 tgl 2301 ECB : {
668 tgl 2302 GIC 15 : have_param_mode = true;
2303 15 : break;
2304 : }
668 tgl 2305 ECB : }
2306 :
668 tgl 2307 GIC 73 : if (!have_param_mode)
2308 : {
2309 : Oid poid;
668 tgl 2310 ECB :
2311 : /* Without mode marks, objargs surely includes all params */
668 tgl 2312 GIC 58 : Assert(list_length(func->objfuncargs) == argcount);
668 tgl 2313 ECB :
2314 : /* For objtype == OBJECT_PROCEDURE, we can ignore non-procedures */
668 tgl 2315 GIC 58 : poid = LookupFuncNameInternal(objtype, func->objname,
2316 : argcount, argoids,
2317 : true, missing_ok,
2318 : &lookupError);
668 tgl 2319 ECB :
2320 : /* Combine results, handling ambiguity */
668 tgl 2321 CBC 58 : if (OidIsValid(poid))
2322 : {
668 tgl 2323 GIC 49 : if (OidIsValid(oid) && oid != poid)
668 tgl 2324 EUB : {
2325 : /* oops, we got hits both ways, on different objects */
668 tgl 2326 UIC 0 : oid = InvalidOid;
2327 0 : lookupError = FUNCLOOKUP_AMBIGUOUS;
668 tgl 2328 ECB : }
2329 : else
668 tgl 2330 CBC 49 : oid = poid;
668 tgl 2331 ECB : }
668 tgl 2332 GIC 9 : else if (lookupError == FUNCLOOKUP_AMBIGUOUS)
2333 3 : oid = InvalidOid;
2334 : }
668 tgl 2335 ECB : }
2336 :
1480 tgl 2337 GIC 25762 : 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
668 tgl 2348 ECB : * LookupFuncNameInternal to apply that check at all.)
2349 : */
1480 tgl 2350 CBC 25623 : switch (objtype)
2351 : {
2352 25352 : case OBJECT_FUNCTION:
1480 tgl 2353 ECB : /* Only complain if it's a procedure. */
1480 tgl 2354 GIC 25352 : if (get_func_prokind(oid) == PROKIND_PROCEDURE)
2355 9 : ereport(ERROR,
2356 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2357 : errmsg("%s is not a function",
1480 tgl 2358 ECB : func_signature_string(func->objname, argcount,
2359 : NIL, argoids))));
1480 tgl 2360 CBC 25343 : break;
2361 :
2362 96 : case OBJECT_PROCEDURE:
1480 tgl 2363 ECB : /* Reject if found object is not a procedure. */
1480 tgl 2364 GIC 96 : if (get_func_prokind(oid) != PROKIND_PROCEDURE)
2365 6 : ereport(ERROR,
2366 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2367 : errmsg("%s is not a procedure",
1480 tgl 2368 ECB : func_signature_string(func->objname, argcount,
2369 : NIL, argoids))));
1480 tgl 2370 CBC 90 : break;
2371 :
2372 153 : case OBJECT_AGGREGATE:
1480 tgl 2373 ECB : /* Reject if found object is not an aggregate. */
1480 tgl 2374 GIC 153 : if (get_func_prokind(oid) != PROKIND_AGGREGATE)
2375 9 : ereport(ERROR,
2376 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2377 : errmsg("function %s is not an aggregate",
1480 tgl 2378 ECB : func_signature_string(func->objname, argcount,
2379 : NIL, argoids))));
1480 tgl 2380 CBC 144 : break;
2381 :
2382 22 : default:
2383 : /* OBJECT_ROUTINE accepts anything. */
1480 tgl 2384 GIC 22 : break;
1956 peter_e 2385 ECB : }
2386 :
1480 tgl 2387 GIC 25599 : return oid; /* All good */
2388 : }
2389 : else
6203 tgl 2390 ECB : {
2391 : /* Deal with cases where the lookup failed */
1480 tgl 2392 CBC 139 : switch (lookupError)
2393 : {
2394 115 : case FUNCLOOKUP_NOSUCHFUNC:
1480 tgl 2395 ECB : /* Suppress no-such-func errors when missing_ok is true */
1480 tgl 2396 GIC 115 : if (missing_ok)
2397 26 : break;
2398 :
1480 tgl 2399 ECB : switch (objtype)
2400 : {
1480 tgl 2401 GBC 18 : case OBJECT_PROCEDURE:
1480 tgl 2402 GIC 18 : if (func->args_unspecified)
1480 tgl 2403 UIC 0 : ereport(ERROR,
2404 : (errcode(ERRCODE_UNDEFINED_FUNCTION),
2405 : errmsg("could not find a procedure named \"%s\"",
1480 tgl 2406 ECB : NameListToString(func->objname))));
2407 : else
1480 tgl 2408 GIC 18 : ereport(ERROR,
2409 : (errcode(ERRCODE_UNDEFINED_FUNCTION),
2410 : errmsg("procedure %s does not exist",
2411 : func_signature_string(func->objname, argcount,
2412 : NIL, argoids))));
1480 tgl 2413 ECB : break;
2414 :
1480 tgl 2415 GBC 30 : case OBJECT_AGGREGATE:
1480 tgl 2416 GIC 30 : if (func->args_unspecified)
1480 tgl 2417 UIC 0 : ereport(ERROR,
2418 : (errcode(ERRCODE_UNDEFINED_FUNCTION),
1480 tgl 2419 ECB : errmsg("could not find an aggregate named \"%s\"",
2420 : NameListToString(func->objname))));
1480 tgl 2421 GIC 30 : else if (argcount == 0)
2422 12 : ereport(ERROR,
2423 : (errcode(ERRCODE_UNDEFINED_FUNCTION),
2424 : errmsg("aggregate %s(*) does not exist",
1480 tgl 2425 ECB : NameListToString(func->objname))));
2426 : else
1480 tgl 2427 GIC 18 : ereport(ERROR,
2428 : (errcode(ERRCODE_UNDEFINED_FUNCTION),
2429 : errmsg("aggregate %s does not exist",
2430 : func_signature_string(func->objname, argcount,
2431 : NIL, argoids))));
1480 tgl 2432 ECB : break;
2433 :
1480 tgl 2434 CBC 41 : default:
1480 tgl 2435 ECB : /* FUNCTION and ROUTINE */
1480 tgl 2436 GIC 41 : if (func->args_unspecified)
2437 3 : ereport(ERROR,
2438 : (errcode(ERRCODE_UNDEFINED_FUNCTION),
2439 : errmsg("could not find a function named \"%s\"",
1480 tgl 2440 ECB : NameListToString(func->objname))));
2441 : else
1480 tgl 2442 GIC 38 : 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 : }
1478 tgl 2449 ECB : break;
2450 :
1480 tgl 2451 GIC 24 : case FUNCLOOKUP_AMBIGUOUS:
1480 tgl 2452 ECB : switch (objtype)
2453 : {
1480 tgl 2454 GIC 9 : case OBJECT_FUNCTION:
2455 9 : ereport(ERROR,
2456 : (errcode(ERRCODE_AMBIGUOUS_FUNCTION),
2457 : errmsg("function name \"%s\" is not unique",
2458 : NameListToString(func->objname)),
2459 : func->args_unspecified ?
668 tgl 2460 ECB : errhint("Specify the argument list to select the function unambiguously.") : 0));
1480 2461 : break;
1480 tgl 2462 GIC 12 : case OBJECT_PROCEDURE:
2463 12 : ereport(ERROR,
2464 : (errcode(ERRCODE_AMBIGUOUS_FUNCTION),
2465 : errmsg("procedure name \"%s\" is not unique",
2466 : NameListToString(func->objname)),
2467 : func->args_unspecified ?
668 tgl 2468 EUB : errhint("Specify the argument list to select the procedure unambiguously.") : 0));
1480 2469 : break;
1480 tgl 2470 UIC 0 : case OBJECT_AGGREGATE:
2471 0 : ereport(ERROR,
2472 : (errcode(ERRCODE_AMBIGUOUS_FUNCTION),
2473 : errmsg("aggregate name \"%s\" is not unique",
2474 : NameListToString(func->objname)),
2475 : func->args_unspecified ?
668 tgl 2476 ECB : errhint("Specify the argument list to select the aggregate unambiguously.") : 0));
1480 2477 : break;
1480 tgl 2478 GIC 3 : case OBJECT_ROUTINE:
2479 3 : 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));
1480 tgl 2485 EUB : break;
2486 :
1480 tgl 2487 UIC 0 : default:
2488 0 : Assert(false); /* Disallowed by Assert above */
2489 : break;
2490 : }
2491 : break;
1956 peter_e 2492 ECB : }
2493 :
1480 tgl 2494 GIC 26 : 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.
2399 tgl 2508 ECB : */
2509 : void
2126 tgl 2510 GIC 36752 : 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
2399 tgl 2525 ECB : * message to avoid creating translation problems.)
2526 : */
2399 tgl 2527 CBC 36752 : err = NULL;
2399 tgl 2528 GIC 36752 : errkind = false;
2399 tgl 2529 GBC 36752 : switch (pstate->p_expr_kind)
2399 tgl 2530 EUB : {
2399 tgl 2531 UIC 0 : case EXPR_KIND_NONE:
2399 tgl 2532 UBC 0 : Assert(false); /* can't happen */
2533 : break;
2534 0 : case EXPR_KIND_OTHER:
2399 tgl 2535 EUB : /* Accept SRF here; caller must throw error if wanted */
2399 tgl 2536 UIC 0 : break;
2399 tgl 2537 UBC 0 : case EXPR_KIND_JOIN_ON:
2399 tgl 2538 EUB : case EXPR_KIND_JOIN_USING:
2399 tgl 2539 UBC 0 : err = _("set-returning functions are not allowed in JOIN conditions");
2399 tgl 2540 UIC 0 : break;
2399 tgl 2541 UBC 0 : case EXPR_KIND_FROM_SUBSELECT:
2399 tgl 2542 EUB : /* can't get here, but just in case, throw an error */
2399 tgl 2543 LBC 0 : errkind = true;
2399 tgl 2544 UIC 0 : break;
2399 tgl 2545 GIC 25970 : case EXPR_KIND_FROM_FUNCTION:
2546 : /* okay, but we don't allow nested SRFs here */
2126 tgl 2547 ECB : /* errmsg is chosen to match transformRangeFunction() */
2548 : /* errposition should point to the inner SRF */
2126 tgl 2549 GIC 25970 : if (pstate->p_last_srf != last_srf)
2550 3 : ereport(ERROR,
2551 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2552 : errmsg("set-returning functions must appear at top level of FROM"),
2126 tgl 2553 ECB : parser_errposition(pstate,
2118 tgl 2554 EUB : exprLocation(pstate->p_last_srf))));
2399 tgl 2555 GBC 25967 : break;
2399 tgl 2556 UBC 0 : case EXPR_KIND_WHERE:
2557 0 : errkind = true;
2558 0 : break;
2559 0 : case EXPR_KIND_POLICY:
2560 0 : err = _("set-returning functions are not allowed in policy expressions");
2561 0 : break;
2562 0 : case EXPR_KIND_HAVING:
2563 0 : errkind = true;
2564 0 : break;
2565 0 : case EXPR_KIND_FILTER:
2399 tgl 2566 LBC 0 : errkind = true;
2399 tgl 2567 UIC 0 : break;
2399 tgl 2568 GIC 6 : case EXPR_KIND_WINDOW_PARTITION:
2399 tgl 2569 ECB : case EXPR_KIND_WINDOW_ORDER:
2570 : /* okay, these are effectively GROUP BY/ORDER BY */
2399 tgl 2571 GBC 6 : pstate->p_hasTargetSRFs = true;
2399 tgl 2572 GIC 6 : break;
2399 tgl 2573 UIC 0 : case EXPR_KIND_WINDOW_FRAME_RANGE:
2399 tgl 2574 EUB : case EXPR_KIND_WINDOW_FRAME_ROWS:
1887 2575 : case EXPR_KIND_WINDOW_FRAME_GROUPS:
2399 tgl 2576 LBC 0 : err = _("set-returning functions are not allowed in window definitions");
2399 tgl 2577 UIC 0 : break;
2399 tgl 2578 GIC 10688 : case EXPR_KIND_SELECT_TARGET:
2399 tgl 2579 ECB : case EXPR_KIND_INSERT_TARGET:
2580 : /* okay */
2399 tgl 2581 CBC 10688 : pstate->p_hasTargetSRFs = true;
2399 tgl 2582 GIC 10688 : break;
2583 3 : case EXPR_KIND_UPDATE_SOURCE:
2399 tgl 2584 ECB : case EXPR_KIND_UPDATE_TARGET:
2585 : /* disallowed because it would be ambiguous what to do */
2399 tgl 2586 CBC 3 : errkind = true;
2399 tgl 2587 GIC 3 : break;
2588 18 : case EXPR_KIND_GROUP_BY:
2399 tgl 2589 ECB : case EXPR_KIND_ORDER_BY:
2590 : /* okay */
2399 tgl 2591 GBC 18 : pstate->p_hasTargetSRFs = true;
2399 tgl 2592 GIC 18 : break;
2399 tgl 2593 UBC 0 : case EXPR_KIND_DISTINCT_ON:
2399 tgl 2594 EUB : /* okay */
2399 tgl 2595 LBC 0 : pstate->p_hasTargetSRFs = true;
2399 tgl 2596 UIC 0 : break;
2399 tgl 2597 CBC 3 : case EXPR_KIND_LIMIT:
2399 tgl 2598 ECB : case EXPR_KIND_OFFSET:
2399 tgl 2599 CBC 3 : errkind = true;
2600 3 : break;
2601 3 : case EXPR_KIND_RETURNING:
2602 3 : errkind = true;
2399 tgl 2603 GIC 3 : break;
2399 tgl 2604 CBC 3 : case EXPR_KIND_VALUES:
2274 tgl 2605 ECB : /* SRFs are presently not supported by nodeValuesscan.c */
2274 tgl 2606 CBC 3 : errkind = true;
2274 tgl 2607 GIC 3 : break;
2274 tgl 2608 CBC 40 : case EXPR_KIND_VALUES_SINGLE:
2274 tgl 2609 ECB : /* okay, since we process this like a SELECT tlist */
2274 tgl 2610 GBC 40 : pstate->p_hasTargetSRFs = true;
2399 2611 40 : break;
377 alvherre 2612 UBC 0 : case EXPR_KIND_MERGE_WHEN:
2613 0 : err = _("set-returning functions are not allowed in MERGE WHEN conditions");
377 alvherre 2614 UIC 0 : break;
2399 tgl 2615 UBC 0 : case EXPR_KIND_CHECK_CONSTRAINT:
2399 tgl 2616 EUB : case EXPR_KIND_DOMAIN_CHECK:
2399 tgl 2617 LBC 0 : err = _("set-returning functions are not allowed in check constraints");
2399 tgl 2618 UIC 0 : break;
2399 tgl 2619 CBC 3 : case EXPR_KIND_COLUMN_DEFAULT:
2399 tgl 2620 ECB : case EXPR_KIND_FUNCTION_DEFAULT:
2399 tgl 2621 GBC 3 : err = _("set-returning functions are not allowed in DEFAULT expressions");
2622 3 : break;
2399 tgl 2623 UBC 0 : case EXPR_KIND_INDEX_EXPRESSION:
2624 0 : err = _("set-returning functions are not allowed in index expressions");
2625 0 : break;
2626 0 : case EXPR_KIND_INDEX_PREDICATE:
2627 0 : err = _("set-returning functions are not allowed in index predicates");
2628 0 : break;
744 tomas.vondra 2629 0 : case EXPR_KIND_STATS_EXPRESSION:
2630 0 : err = _("set-returning functions are not allowed in statistics expressions");
2631 0 : break;
2399 tgl 2632 0 : case EXPR_KIND_ALTER_COL_TRANSFORM:
2633 0 : err = _("set-returning functions are not allowed in transform expressions");
2634 0 : break;
2635 0 : case EXPR_KIND_EXECUTE_PARAMETER:
2636 0 : err = _("set-returning functions are not allowed in EXECUTE parameters");
2637 0 : break;
2638 0 : case EXPR_KIND_TRIGGER_WHEN:
2399 tgl 2639 LBC 0 : err = _("set-returning functions are not allowed in trigger WHEN conditions");
2640 0 : break;
1535 peter 2641 CBC 6 : case EXPR_KIND_PARTITION_BOUND:
2642 6 : err = _("set-returning functions are not allowed in partition bound");
2643 6 : break;
2314 rhaas 2644 3 : case EXPR_KIND_PARTITION_EXPRESSION:
2126 tgl 2645 GBC 3 : err = _("set-returning functions are not allowed in partition key expressions");
2314 rhaas 2646 3 : break;
1884 tgl 2647 UBC 0 : case EXPR_KIND_CALL_ARGUMENT:
1956 peter_e 2648 LBC 0 : err = _("set-returning functions are not allowed in CALL arguments");
2649 0 : break;
1541 tomas.vondra 2650 CBC 3 : case EXPR_KIND_COPY_WHERE:
2651 3 : err = _("set-returning functions are not allowed in COPY FROM WHERE conditions");
2652 3 : break;
1471 peter 2653 3 : case EXPR_KIND_GENERATED_COLUMN:
1471 peter 2654 GBC 3 : err = _("set-returning functions are not allowed in column generation expressions");
2655 3 : break;
797 peter 2656 UBC 0 : case EXPR_KIND_CYCLE_MARK:
797 peter 2657 UIC 0 : errkind = true;
2658 0 : 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.
2399 tgl 2666 ECB : */
2667 : }
2399 tgl 2668 GIC 36749 : if (err)
2669 18 : ereport(ERROR,
2670 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2399 tgl 2671 ECB : errmsg_internal("%s", err),
2672 : parser_errposition(pstate, location)));
2399 tgl 2673 GIC 36731 : if (errkind)
2674 12 : 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",
2399 tgl 2678 ECB : ParseExprKindName(pstate->p_expr_kind)),
2679 : parser_errposition(pstate, location)));
2399 tgl 2680 GIC 36719 : }
|
