/*------------------------------------------------------------------------- * * parse_func.c * handle function calls in parser * * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * * IDENTIFICATION * src/backend/parser/parse_func.c * *------------------------------------------------------------------------- */ #include "postgres.h" #include "access/htup_details.h" #include "catalog/pg_aggregate.h" #include "catalog/pg_proc.h" #include "catalog/pg_type.h" #include "funcapi.h" #include "lib/stringinfo.h" #include "nodes/makefuncs.h" #include "nodes/nodeFuncs.h" #include "parser/parse_agg.h" #include "parser/parse_clause.h" #include "parser/parse_coerce.h" #include "parser/parse_expr.h" #include "parser/parse_func.h" #include "parser/parse_relation.h" #include "parser/parse_target.h" #include "parser/parse_type.h" #include "utils/builtins.h" #include "utils/lsyscache.h" #include "utils/syscache.h" /* Possible error codes from LookupFuncNameInternal */ typedef enum { FUNCLOOKUP_NOSUCHFUNC, FUNCLOOKUP_AMBIGUOUS } FuncLookupError; static void unify_hypothetical_args(ParseState *pstate, List *fargs, int numAggregatedArgs, Oid *actual_arg_types, Oid *declared_arg_types); static Oid FuncNameAsType(List *funcname); static Node *ParseComplexProjection(ParseState *pstate, const char *funcname, Node *first_arg, int location); static Oid LookupFuncNameInternal(ObjectType objtype, List *funcname, int nargs, const Oid *argtypes, bool include_out_arguments, bool missing_ok, FuncLookupError *lookupError); /* * Parse a function call * * For historical reasons, Postgres tries to treat the notations tab.col * and col(tab) as equivalent: if a single-argument function call has an * argument of complex type and the (unqualified) function name matches * any attribute of the type, we can interpret it as a column projection. * Conversely a function of a single complex-type argument can be written * like a column reference, allowing functions to act like computed columns. * * If both interpretations are possible, we prefer the one matching the * syntactic form, but otherwise the form does not matter. * * Hence, both cases come through here. If fn is null, we're dealing with * column syntax not function syntax. In the function-syntax case, * the FuncCall struct is needed to carry various decoration that applies * to aggregate and window functions. * * Also, when fn is null, we return NULL on failure rather than * reporting a no-such-function error. * * The argument expressions (in fargs) must have been transformed * already. However, nothing in *fn has been transformed. * * last_srf should be a copy of pstate->p_last_srf from just before we * started transforming fargs. If the caller knows that fargs couldn't * contain any SRF calls, last_srf can just be pstate->p_last_srf. * * proc_call is true if we are considering a CALL statement, so that the * name must resolve to a procedure name, not anything else. This flag * also specifies that the argument list includes any OUT-mode arguments. */ Node * ParseFuncOrColumn(ParseState *pstate, List *funcname, List *fargs, Node *last_srf, FuncCall *fn, bool proc_call, int location) { bool is_column = (fn == NULL); List *agg_order = (fn ? fn->agg_order : NIL); Expr *agg_filter = NULL; WindowDef *over = (fn ? fn->over : NULL); bool agg_within_group = (fn ? fn->agg_within_group : false); bool agg_star = (fn ? fn->agg_star : false); bool agg_distinct = (fn ? fn->agg_distinct : false); bool func_variadic = (fn ? fn->func_variadic : false); CoercionForm funcformat = (fn ? fn->funcformat : COERCE_EXPLICIT_CALL); bool could_be_projection; Oid rettype; Oid funcid; ListCell *l; Node *first_arg = NULL; int nargs; int nargsplusdefs; Oid actual_arg_types[FUNC_MAX_ARGS]; Oid *declared_arg_types; List *argnames; List *argdefaults; Node *retval; bool retset; int nvargs; Oid vatype; FuncDetailCode fdresult; char aggkind = 0; ParseCallbackState pcbstate; /* * If there's an aggregate filter, transform it using transformWhereClause */ if (fn && fn->agg_filter != NULL) agg_filter = (Expr *) transformWhereClause(pstate, fn->agg_filter, EXPR_KIND_FILTER, "FILTER"); /* * Most of the rest of the parser just assumes that functions do not have * more than FUNC_MAX_ARGS parameters. We have to test here to protect * against array overruns, etc. Of course, this may not be a function, * but the test doesn't hurt. */ if (list_length(fargs) > FUNC_MAX_ARGS) ereport(ERROR, (errcode(ERRCODE_TOO_MANY_ARGUMENTS), errmsg_plural("cannot pass more than %d argument to a function", "cannot pass more than %d arguments to a function", FUNC_MAX_ARGS, FUNC_MAX_ARGS), parser_errposition(pstate, location))); /* * Extract arg type info in preparation for function lookup. * * If any arguments are Param markers of type VOID, we discard them from * the parameter list. This is a hack to allow the JDBC driver to not have * to distinguish "input" and "output" parameter symbols while parsing * function-call constructs. Don't do this if dealing with column syntax, * nor if we had WITHIN GROUP (because in that case it's critical to keep * the argument count unchanged). */ nargs = 0; foreach(l, fargs) { Node *arg = lfirst(l); Oid argtype = exprType(arg); if (argtype == VOIDOID && IsA(arg, Param) && !is_column && !agg_within_group) { fargs = foreach_delete_current(fargs, l); continue; } actual_arg_types[nargs++] = argtype; } /* * Check for named arguments; if there are any, build a list of names. * * We allow mixed notation (some named and some not), but only with all * the named parameters after all the unnamed ones. So the name list * corresponds to the last N actual parameters and we don't need any extra * bookkeeping to match things up. */ argnames = NIL; foreach(l, fargs) { Node *arg = lfirst(l); if (IsA(arg, NamedArgExpr)) { NamedArgExpr *na = (NamedArgExpr *) arg; ListCell *lc; /* Reject duplicate arg names */ foreach(lc, argnames) { if (strcmp(na->name, (char *) lfirst(lc)) == 0) ereport(ERROR, (errcode(ERRCODE_SYNTAX_ERROR), errmsg("argument name \"%s\" used more than once", na->name), parser_errposition(pstate, na->location))); } argnames = lappend(argnames, na->name); } else { if (argnames != NIL) ereport(ERROR, (errcode(ERRCODE_SYNTAX_ERROR), errmsg("positional argument cannot follow named argument"), parser_errposition(pstate, exprLocation(arg)))); } } if (fargs) { first_arg = linitial(fargs); Assert(first_arg != NULL); } /* * Decide whether it's legitimate to consider the construct to be a column * projection. For that, there has to be a single argument of complex * type, the function name must not be qualified, and there cannot be any * syntactic decoration that'd require it to be a function (such as * aggregate or variadic decoration, or named arguments). */ could_be_projection = (nargs == 1 && !proc_call && agg_order == NIL && agg_filter == NULL && !agg_star && !agg_distinct && over == NULL && !func_variadic && argnames == NIL && list_length(funcname) == 1 && (actual_arg_types[0] == RECORDOID || ISCOMPLEX(actual_arg_types[0]))); /* * If it's column syntax, check for column projection case first. */ if (could_be_projection && is_column) { retval = ParseComplexProjection(pstate, strVal(linitial(funcname)), first_arg, location); if (retval) return retval; /* * If ParseComplexProjection doesn't recognize it as a projection, * just press on. */ } /* * func_get_detail looks up the function in the catalogs, does * disambiguation for polymorphic functions, handles inheritance, and * returns the funcid and type and set or singleton status of the * function's return value. It also returns the true argument types to * the function. * * Note: for a named-notation or variadic function call, the reported * "true" types aren't really what is in pg_proc: the types are reordered * to match the given argument order of named arguments, and a variadic * argument is replaced by a suitable number of copies of its element * type. We'll fix up the variadic case below. We may also have to deal * with default arguments. */ setup_parser_errposition_callback(&pcbstate, pstate, location); fdresult = func_get_detail(funcname, fargs, argnames, nargs, actual_arg_types, !func_variadic, true, proc_call, &funcid, &rettype, &retset, &nvargs, &vatype, &declared_arg_types, &argdefaults); cancel_parser_errposition_callback(&pcbstate); /* * Check for various wrong-kind-of-routine cases. */ /* If this is a CALL, reject things that aren't procedures */ if (proc_call && (fdresult == FUNCDETAIL_NORMAL || fdresult == FUNCDETAIL_AGGREGATE || fdresult == FUNCDETAIL_WINDOWFUNC || fdresult == FUNCDETAIL_COERCION)) ereport(ERROR, (errcode(ERRCODE_WRONG_OBJECT_TYPE), errmsg("%s is not a procedure", func_signature_string(funcname, nargs, argnames, actual_arg_types)), errhint("To call a function, use SELECT."), parser_errposition(pstate, location))); /* Conversely, if not a CALL, reject procedures */ if (fdresult == FUNCDETAIL_PROCEDURE && !proc_call) ereport(ERROR, (errcode(ERRCODE_WRONG_OBJECT_TYPE), errmsg("%s is a procedure", func_signature_string(funcname, nargs, argnames, actual_arg_types)), errhint("To call a procedure, use CALL."), parser_errposition(pstate, location))); if (fdresult == FUNCDETAIL_NORMAL || fdresult == FUNCDETAIL_PROCEDURE || fdresult == FUNCDETAIL_COERCION) { /* * In these cases, complain if there was anything indicating it must * be an aggregate or window function. */ if (agg_star) ereport(ERROR, (errcode(ERRCODE_WRONG_OBJECT_TYPE), errmsg("%s(*) specified, but %s is not an aggregate function", NameListToString(funcname), NameListToString(funcname)), parser_errposition(pstate, location))); if (agg_distinct) ereport(ERROR, (errcode(ERRCODE_WRONG_OBJECT_TYPE), errmsg("DISTINCT specified, but %s is not an aggregate function", NameListToString(funcname)), parser_errposition(pstate, location))); if (agg_within_group) ereport(ERROR, (errcode(ERRCODE_WRONG_OBJECT_TYPE), errmsg("WITHIN GROUP specified, but %s is not an aggregate function", NameListToString(funcname)), parser_errposition(pstate, location))); if (agg_order != NIL) ereport(ERROR, (errcode(ERRCODE_WRONG_OBJECT_TYPE), errmsg("ORDER BY specified, but %s is not an aggregate function", NameListToString(funcname)), parser_errposition(pstate, location))); if (agg_filter) ereport(ERROR, (errcode(ERRCODE_WRONG_OBJECT_TYPE), errmsg("FILTER specified, but %s is not an aggregate function", NameListToString(funcname)), parser_errposition(pstate, location))); if (over) ereport(ERROR, (errcode(ERRCODE_WRONG_OBJECT_TYPE), errmsg("OVER specified, but %s is not a window function nor an aggregate function", NameListToString(funcname)), parser_errposition(pstate, location))); } /* * So far so good, so do some fdresult-type-specific processing. */ if (fdresult == FUNCDETAIL_NORMAL || fdresult == FUNCDETAIL_PROCEDURE) { /* Nothing special to do for these cases. */ } else if (fdresult == FUNCDETAIL_AGGREGATE) { /* * It's an aggregate; fetch needed info from the pg_aggregate entry. */ HeapTuple tup; Form_pg_aggregate classForm; int catDirectArgs; tup = SearchSysCache1(AGGFNOID, ObjectIdGetDatum(funcid)); if (!HeapTupleIsValid(tup)) /* should not happen */ elog(ERROR, "cache lookup failed for aggregate %u", funcid); classForm = (Form_pg_aggregate) GETSTRUCT(tup); aggkind = classForm->aggkind; catDirectArgs = classForm->aggnumdirectargs; ReleaseSysCache(tup); /* Now check various disallowed cases. */ if (AGGKIND_IS_ORDERED_SET(aggkind)) { int numAggregatedArgs; int numDirectArgs; if (!agg_within_group) ereport(ERROR, (errcode(ERRCODE_WRONG_OBJECT_TYPE), errmsg("WITHIN GROUP is required for ordered-set aggregate %s", NameListToString(funcname)), parser_errposition(pstate, location))); if (over) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), errmsg("OVER is not supported for ordered-set aggregate %s", NameListToString(funcname)), parser_errposition(pstate, location))); /* gram.y rejects DISTINCT + WITHIN GROUP */ Assert(!agg_distinct); /* gram.y rejects VARIADIC + WITHIN GROUP */ Assert(!func_variadic); /* * Since func_get_detail was working with an undifferentiated list * of arguments, it might have selected an aggregate that doesn't * really match because it requires a different division of direct * and aggregated arguments. Check that the number of direct * arguments is actually OK; if not, throw an "undefined function" * error, similarly to the case where a misplaced ORDER BY is used * in a regular aggregate call. */ numAggregatedArgs = list_length(agg_order); numDirectArgs = nargs - numAggregatedArgs; Assert(numDirectArgs >= 0); if (!OidIsValid(vatype)) { /* Test is simple if aggregate isn't variadic */ if (numDirectArgs != catDirectArgs) ereport(ERROR, (errcode(ERRCODE_UNDEFINED_FUNCTION), errmsg("function %s does not exist", func_signature_string(funcname, nargs, argnames, actual_arg_types)), errhint_plural("There is an ordered-set aggregate %s, but it requires %d direct argument, not %d.", "There is an ordered-set aggregate %s, but it requires %d direct arguments, not %d.", catDirectArgs, NameListToString(funcname), catDirectArgs, numDirectArgs), parser_errposition(pstate, location))); } else { /* * If it's variadic, we have two cases depending on whether * the agg was "... ORDER BY VARIADIC" or "..., VARIADIC ORDER * BY VARIADIC". It's the latter if catDirectArgs equals * pronargs; to save a catalog lookup, we reverse-engineer * pronargs from the info we got from func_get_detail. */ int pronargs; pronargs = nargs; if (nvargs > 1) pronargs -= nvargs - 1; if (catDirectArgs < pronargs) { /* VARIADIC isn't part of direct args, so still easy */ if (numDirectArgs != catDirectArgs) ereport(ERROR, (errcode(ERRCODE_UNDEFINED_FUNCTION), errmsg("function %s does not exist", func_signature_string(funcname, nargs, argnames, actual_arg_types)), errhint_plural("There is an ordered-set aggregate %s, but it requires %d direct argument, not %d.", "There is an ordered-set aggregate %s, but it requires %d direct arguments, not %d.", catDirectArgs, NameListToString(funcname), catDirectArgs, numDirectArgs), parser_errposition(pstate, location))); } else { /* * Both direct and aggregated args were declared variadic. * For a standard ordered-set aggregate, it's okay as long * as there aren't too few direct args. For a * hypothetical-set aggregate, we assume that the * hypothetical arguments are those that matched the * variadic parameter; there must be just as many of them * as there are aggregated arguments. */ if (aggkind == AGGKIND_HYPOTHETICAL) { if (nvargs != 2 * numAggregatedArgs) ereport(ERROR, (errcode(ERRCODE_UNDEFINED_FUNCTION), errmsg("function %s does not exist", func_signature_string(funcname, nargs, argnames, actual_arg_types)), 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).", NameListToString(funcname), nvargs - numAggregatedArgs, numAggregatedArgs), parser_errposition(pstate, location))); } else { if (nvargs <= numAggregatedArgs) ereport(ERROR, (errcode(ERRCODE_UNDEFINED_FUNCTION), errmsg("function %s does not exist", func_signature_string(funcname, nargs, argnames, actual_arg_types)), errhint_plural("There is an ordered-set aggregate %s, but it requires at least %d direct argument.", "There is an ordered-set aggregate %s, but it requires at least %d direct arguments.", catDirectArgs, NameListToString(funcname), catDirectArgs), parser_errposition(pstate, location))); } } } /* Check type matching of hypothetical arguments */ if (aggkind == AGGKIND_HYPOTHETICAL) unify_hypothetical_args(pstate, fargs, numAggregatedArgs, actual_arg_types, declared_arg_types); } else { /* Normal aggregate, so it can't have WITHIN GROUP */ if (agg_within_group) ereport(ERROR, (errcode(ERRCODE_WRONG_OBJECT_TYPE), errmsg("%s is not an ordered-set aggregate, so it cannot have WITHIN GROUP", NameListToString(funcname)), parser_errposition(pstate, location))); } } else if (fdresult == FUNCDETAIL_WINDOWFUNC) { /* * True window functions must be called with a window definition. */ if (!over) ereport(ERROR, (errcode(ERRCODE_WRONG_OBJECT_TYPE), errmsg("window function %s requires an OVER clause", NameListToString(funcname)), parser_errposition(pstate, location))); /* And, per spec, WITHIN GROUP isn't allowed */ if (agg_within_group) ereport(ERROR, (errcode(ERRCODE_WRONG_OBJECT_TYPE), errmsg("window function %s cannot have WITHIN GROUP", NameListToString(funcname)), parser_errposition(pstate, location))); } else if (fdresult == FUNCDETAIL_COERCION) { /* * We interpreted it as a type coercion. coerce_type can handle these * cases, so why duplicate code... */ return coerce_type(pstate, linitial(fargs), actual_arg_types[0], rettype, -1, COERCION_EXPLICIT, COERCE_EXPLICIT_CALL, location); } else if (fdresult == FUNCDETAIL_MULTIPLE) { /* * We found multiple possible functional matches. If we are dealing * with attribute notation, return failure, letting the caller report * "no such column" (we already determined there wasn't one). If * dealing with function notation, report "ambiguous function", * regardless of whether there's also a column by this name. */ if (is_column) return NULL; if (proc_call) ereport(ERROR, (errcode(ERRCODE_AMBIGUOUS_FUNCTION), errmsg("procedure %s is not unique", func_signature_string(funcname, nargs, argnames, actual_arg_types)), errhint("Could not choose a best candidate procedure. " "You might need to add explicit type casts."), parser_errposition(pstate, location))); else ereport(ERROR, (errcode(ERRCODE_AMBIGUOUS_FUNCTION), errmsg("function %s is not unique", func_signature_string(funcname, nargs, argnames, actual_arg_types)), errhint("Could not choose a best candidate function. " "You might need to add explicit type casts."), parser_errposition(pstate, location))); } else { /* * Not found as a function. If we are dealing with attribute * notation, return failure, letting the caller report "no such * column" (we already determined there wasn't one). */ if (is_column) return NULL; /* * Check for column projection interpretation, since we didn't before. */ if (could_be_projection) { retval = ParseComplexProjection(pstate, strVal(linitial(funcname)), first_arg, location); if (retval) return retval; } /* * No function, and no column either. Since we're dealing with * function notation, report "function does not exist". */ if (list_length(agg_order) > 1 && !agg_within_group) { /* It's agg(x, ORDER BY y,z) ... perhaps misplaced ORDER BY */ ereport(ERROR, (errcode(ERRCODE_UNDEFINED_FUNCTION), errmsg("function %s does not exist", func_signature_string(funcname, nargs, argnames, actual_arg_types)), errhint("No aggregate function matches the given name and argument types. " "Perhaps you misplaced ORDER BY; ORDER BY must appear " "after all regular arguments of the aggregate."), parser_errposition(pstate, location))); } else if (proc_call) ereport(ERROR, (errcode(ERRCODE_UNDEFINED_FUNCTION), errmsg("procedure %s does not exist", func_signature_string(funcname, nargs, argnames, actual_arg_types)), errhint("No procedure matches the given name and argument types. " "You might need to add explicit type casts."), parser_errposition(pstate, location))); else ereport(ERROR, (errcode(ERRCODE_UNDEFINED_FUNCTION), errmsg("function %s does not exist", func_signature_string(funcname, nargs, argnames, actual_arg_types)), errhint("No function matches the given name and argument types. " "You might need to add explicit type casts."), parser_errposition(pstate, location))); } /* * If there are default arguments, we have to include their types in * actual_arg_types for the purpose of checking generic type consistency. * However, we do NOT put them into the generated parse node, because * their actual values might change before the query gets run. The * planner has to insert the up-to-date values at plan time. */ nargsplusdefs = nargs; foreach(l, argdefaults) { Node *expr = (Node *) lfirst(l); /* probably shouldn't happen ... */ if (nargsplusdefs >= FUNC_MAX_ARGS) ereport(ERROR, (errcode(ERRCODE_TOO_MANY_ARGUMENTS), errmsg_plural("cannot pass more than %d argument to a function", "cannot pass more than %d arguments to a function", FUNC_MAX_ARGS, FUNC_MAX_ARGS), parser_errposition(pstate, location))); actual_arg_types[nargsplusdefs++] = exprType(expr); } /* * enforce consistency with polymorphic argument and return types, * possibly adjusting return type or declared_arg_types (which will be * used as the cast destination by make_fn_arguments) */ rettype = enforce_generic_type_consistency(actual_arg_types, declared_arg_types, nargsplusdefs, rettype, false); /* perform the necessary typecasting of arguments */ make_fn_arguments(pstate, fargs, actual_arg_types, declared_arg_types); /* * If the function isn't actually variadic, forget any VARIADIC decoration * on the call. (Perhaps we should throw an error instead, but * historically we've allowed people to write that.) */ if (!OidIsValid(vatype)) { Assert(nvargs == 0); func_variadic = false; } /* * If it's a variadic function call, transform the last nvargs arguments * into an array --- unless it's an "any" variadic. */ if (nvargs > 0 && vatype != ANYOID) { ArrayExpr *newa = makeNode(ArrayExpr); int non_var_args = nargs - nvargs; List *vargs; Assert(non_var_args >= 0); vargs = list_copy_tail(fargs, non_var_args); fargs = list_truncate(fargs, non_var_args); newa->elements = vargs; /* assume all the variadic arguments were coerced to the same type */ newa->element_typeid = exprType((Node *) linitial(vargs)); newa->array_typeid = get_array_type(newa->element_typeid); if (!OidIsValid(newa->array_typeid)) ereport(ERROR, (errcode(ERRCODE_UNDEFINED_OBJECT), errmsg("could not find array type for data type %s", format_type_be(newa->element_typeid)), parser_errposition(pstate, exprLocation((Node *) vargs)))); /* array_collid will be set by parse_collate.c */ newa->multidims = false; newa->location = exprLocation((Node *) vargs); fargs = lappend(fargs, newa); /* We could not have had VARIADIC marking before ... */ Assert(!func_variadic); /* ... but now, it's a VARIADIC call */ func_variadic = true; } /* * If an "any" variadic is called with explicit VARIADIC marking, insist * that the variadic parameter be of some array type. */ if (nargs > 0 && vatype == ANYOID && func_variadic) { Oid va_arr_typid = actual_arg_types[nargs - 1]; if (!OidIsValid(get_base_element_type(va_arr_typid))) ereport(ERROR, (errcode(ERRCODE_DATATYPE_MISMATCH), errmsg("VARIADIC argument must be an array"), parser_errposition(pstate, exprLocation((Node *) llast(fargs))))); } /* if it returns a set, check that's OK */ if (retset) check_srf_call_placement(pstate, last_srf, location); /* build the appropriate output structure */ if (fdresult == FUNCDETAIL_NORMAL || fdresult == FUNCDETAIL_PROCEDURE) { FuncExpr *funcexpr = makeNode(FuncExpr); funcexpr->funcid = funcid; funcexpr->funcresulttype = rettype; funcexpr->funcretset = retset; funcexpr->funcvariadic = func_variadic; funcexpr->funcformat = funcformat; /* funccollid and inputcollid will be set by parse_collate.c */ funcexpr->args = fargs; funcexpr->location = location; retval = (Node *) funcexpr; } else if (fdresult == FUNCDETAIL_AGGREGATE && !over) { /* aggregate function */ Aggref *aggref = makeNode(Aggref); aggref->aggfnoid = funcid; aggref->aggtype = rettype; /* aggcollid and inputcollid will be set by parse_collate.c */ aggref->aggtranstype = InvalidOid; /* will be set by planner */ /* aggargtypes will be set by transformAggregateCall */ /* aggdirectargs and args will be set by transformAggregateCall */ /* aggorder and aggdistinct will be set by transformAggregateCall */ aggref->aggfilter = agg_filter; aggref->aggstar = agg_star; aggref->aggvariadic = func_variadic; aggref->aggkind = aggkind; /* agglevelsup will be set by transformAggregateCall */ aggref->aggsplit = AGGSPLIT_SIMPLE; /* planner might change this */ aggref->aggno = -1; /* planner will set aggno and aggtransno */ aggref->aggtransno = -1; aggref->location = location; /* * Reject attempt to call a parameterless aggregate without (*) * syntax. This is mere pedantry but some folks insisted ... */ if (fargs == NIL && !agg_star && !agg_within_group) ereport(ERROR, (errcode(ERRCODE_WRONG_OBJECT_TYPE), errmsg("%s(*) must be used to call a parameterless aggregate function", NameListToString(funcname)), parser_errposition(pstate, location))); if (retset) ereport(ERROR, (errcode(ERRCODE_INVALID_FUNCTION_DEFINITION), errmsg("aggregates cannot return sets"), parser_errposition(pstate, location))); /* * We might want to support named arguments later, but disallow it for * now. We'd need to figure out the parsed representation (should the * NamedArgExprs go above or below the TargetEntry nodes?) and then * teach the planner to reorder the list properly. Or maybe we could * make transformAggregateCall do that? However, if you'd also like * to allow default arguments for aggregates, we'd need to do it in * planning to avoid semantic problems. */ if (argnames != NIL) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), errmsg("aggregates cannot use named arguments"), parser_errposition(pstate, location))); /* parse_agg.c does additional aggregate-specific processing */ transformAggregateCall(pstate, aggref, fargs, agg_order, agg_distinct); retval = (Node *) aggref; } else { /* window function */ WindowFunc *wfunc = makeNode(WindowFunc); Assert(over); /* lack of this was checked above */ Assert(!agg_within_group); /* also checked above */ wfunc->winfnoid = funcid; wfunc->wintype = rettype; /* wincollid and inputcollid will be set by parse_collate.c */ wfunc->args = fargs; /* winref will be set by transformWindowFuncCall */ wfunc->winstar = agg_star; wfunc->winagg = (fdresult == FUNCDETAIL_AGGREGATE); wfunc->aggfilter = agg_filter; wfunc->location = location; /* * agg_star is allowed for aggregate functions but distinct isn't */ if (agg_distinct) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), errmsg("DISTINCT is not implemented for window functions"), parser_errposition(pstate, location))); /* * Reject attempt to call a parameterless aggregate without (*) * syntax. This is mere pedantry but some folks insisted ... */ if (wfunc->winagg && fargs == NIL && !agg_star) ereport(ERROR, (errcode(ERRCODE_WRONG_OBJECT_TYPE), errmsg("%s(*) must be used to call a parameterless aggregate function", NameListToString(funcname)), parser_errposition(pstate, location))); /* * ordered aggs not allowed in windows yet */ if (agg_order != NIL) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), errmsg("aggregate ORDER BY is not implemented for window functions"), parser_errposition(pstate, location))); /* * FILTER is not yet supported with true window functions */ if (!wfunc->winagg && agg_filter) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), errmsg("FILTER is not implemented for non-aggregate window functions"), parser_errposition(pstate, location))); /* * Window functions can't either take or return sets */ if (pstate->p_last_srf != last_srf) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), errmsg("window function calls cannot contain set-returning function calls"), errhint("You might be able to move the set-returning function into a LATERAL FROM item."), parser_errposition(pstate, exprLocation(pstate->p_last_srf)))); if (retset) ereport(ERROR, (errcode(ERRCODE_INVALID_FUNCTION_DEFINITION), errmsg("window functions cannot return sets"), parser_errposition(pstate, location))); /* parse_agg.c does additional window-func-specific processing */ transformWindowFuncCall(pstate, wfunc, over); retval = (Node *) wfunc; } /* if it returns a set, remember it for error checks at higher levels */ if (retset) pstate->p_last_srf = retval; return retval; } /* func_match_argtypes() * * Given a list of candidate functions (having the right name and number * of arguments) and an array of input datatype OIDs, produce a shortlist of * those candidates that actually accept the input datatypes (either exactly * or by coercion), and return the number of such candidates. * * Note that can_coerce_type will assume that UNKNOWN inputs are coercible to * anything, so candidates will not be eliminated on that basis. * * NB: okay to modify input list structure, as long as we find at least * one match. If no match at all, the list must remain unmodified. */ int func_match_argtypes(int nargs, Oid *input_typeids, FuncCandidateList raw_candidates, FuncCandidateList *candidates) /* return value */ { FuncCandidateList current_candidate; FuncCandidateList next_candidate; int ncandidates = 0; *candidates = NULL; for (current_candidate = raw_candidates; current_candidate != NULL; current_candidate = next_candidate) { next_candidate = current_candidate->next; if (can_coerce_type(nargs, input_typeids, current_candidate->args, COERCION_IMPLICIT)) { current_candidate->next = *candidates; *candidates = current_candidate; ncandidates++; } } return ncandidates; } /* func_match_argtypes() */ /* func_select_candidate() * Given the input argtype array and more than one candidate * for the function, attempt to resolve the conflict. * * Returns the selected candidate if the conflict can be resolved, * otherwise returns NULL. * * Note that the caller has already determined that there is no candidate * exactly matching the input argtypes, and has pruned away any "candidates" * that aren't actually coercion-compatible with the input types. * * This is also used for resolving ambiguous operator references. Formerly * parse_oper.c had its own, essentially duplicate code for the purpose. * The following comments (formerly in parse_oper.c) are kept to record some * of the history of these heuristics. * * OLD COMMENTS: * * This routine is new code, replacing binary_oper_select_candidate() * which dates from v4.2/v1.0.x days. It tries very hard to match up * operators with types, including allowing type coercions if necessary. * The important thing is that the code do as much as possible, * while _never_ doing the wrong thing, where "the wrong thing" would * be returning an operator when other better choices are available, * or returning an operator which is a non-intuitive possibility. * - thomas 1998-05-21 * * The comments below came from binary_oper_select_candidate(), and * illustrate the issues and choices which are possible: * - thomas 1998-05-20 * * current wisdom holds that the default operator should be one in which * both operands have the same type (there will only be one such * operator) * * 7.27.93 - I have decided not to do this; it's too hard to justify, and * it's easy enough to typecast explicitly - avi * [the rest of this routine was commented out since then - ay] * * 6/23/95 - I don't complete agree with avi. In particular, casting * floats is a pain for users. Whatever the rationale behind not doing * this is, I need the following special case to work. * * In the WHERE clause of a query, if a float is specified without * quotes, we treat it as float8. I added the float48* operators so * that we can operate on float4 and float8. But now we have more than * one matching operator if the right arg is unknown (eg. float * specified with quotes). This break some stuff in the regression * test where there are floats in quotes not properly casted. Below is * the solution. In addition to requiring the operator operates on the * same type for both operands [as in the code Avi originally * commented out], we also require that the operators be equivalent in * some sense. (see equivalentOpersAfterPromotion for details.) * - ay 6/95 */ FuncCandidateList func_select_candidate(int nargs, Oid *input_typeids, FuncCandidateList candidates) { FuncCandidateList current_candidate, first_candidate, last_candidate; Oid *current_typeids; Oid current_type; int i; int ncandidates; int nbestMatch, nmatch, nunknowns; Oid input_base_typeids[FUNC_MAX_ARGS]; TYPCATEGORY slot_category[FUNC_MAX_ARGS], current_category; bool current_is_preferred; bool slot_has_preferred_type[FUNC_MAX_ARGS]; bool resolved_unknowns; /* protect local fixed-size arrays */ if (nargs > FUNC_MAX_ARGS) ereport(ERROR, (errcode(ERRCODE_TOO_MANY_ARGUMENTS), errmsg_plural("cannot pass more than %d argument to a function", "cannot pass more than %d arguments to a function", FUNC_MAX_ARGS, FUNC_MAX_ARGS))); /* * If any input types are domains, reduce them to their base types. This * ensures that we will consider functions on the base type to be "exact * matches" in the exact-match heuristic; it also makes it possible to do * something useful with the type-category heuristics. Note that this * makes it difficult, but not impossible, to use functions declared to * take a domain as an input datatype. Such a function will be selected * over the base-type function only if it is an exact match at all * argument positions, and so was already chosen by our caller. * * While we're at it, count the number of unknown-type arguments for use * later. */ nunknowns = 0; for (i = 0; i < nargs; i++) { if (input_typeids[i] != UNKNOWNOID) input_base_typeids[i] = getBaseType(input_typeids[i]); else { /* no need to call getBaseType on UNKNOWNOID */ input_base_typeids[i] = UNKNOWNOID; nunknowns++; } } /* * Run through all candidates and keep those with the most matches on * exact types. Keep all candidates if none match. */ ncandidates = 0; nbestMatch = 0; last_candidate = NULL; for (current_candidate = candidates; current_candidate != NULL; current_candidate = current_candidate->next) { current_typeids = current_candidate->args; nmatch = 0; for (i = 0; i < nargs; i++) { if (input_base_typeids[i] != UNKNOWNOID && current_typeids[i] == input_base_typeids[i]) nmatch++; } /* take this one as the best choice so far? */ if ((nmatch > nbestMatch) || (last_candidate == NULL)) { nbestMatch = nmatch; candidates = current_candidate; last_candidate = current_candidate; ncandidates = 1; } /* no worse than the last choice, so keep this one too? */ else if (nmatch == nbestMatch) { last_candidate->next = current_candidate; last_candidate = current_candidate; ncandidates++; } /* otherwise, don't bother keeping this one... */ } if (last_candidate) /* terminate rebuilt list */ last_candidate->next = NULL; if (ncandidates == 1) return candidates; /* * Still too many candidates? Now look for candidates which have either * exact matches or preferred types at the args that will require * coercion. (Restriction added in 7.4: preferred type must be of same * category as input type; give no preference to cross-category * conversions to preferred types.) Keep all candidates if none match. */ for (i = 0; i < nargs; i++) /* avoid multiple lookups */ slot_category[i] = TypeCategory(input_base_typeids[i]); ncandidates = 0; nbestMatch = 0; last_candidate = NULL; for (current_candidate = candidates; current_candidate != NULL; current_candidate = current_candidate->next) { current_typeids = current_candidate->args; nmatch = 0; for (i = 0; i < nargs; i++) { if (input_base_typeids[i] != UNKNOWNOID) { if (current_typeids[i] == input_base_typeids[i] || IsPreferredType(slot_category[i], current_typeids[i])) nmatch++; } } if ((nmatch > nbestMatch) || (last_candidate == NULL)) { nbestMatch = nmatch; candidates = current_candidate; last_candidate = current_candidate; ncandidates = 1; } else if (nmatch == nbestMatch) { last_candidate->next = current_candidate; last_candidate = current_candidate; ncandidates++; } } if (last_candidate) /* terminate rebuilt list */ last_candidate->next = NULL; if (ncandidates == 1) return candidates; /* * Still too many candidates? Try assigning types for the unknown inputs. * * If there are no unknown inputs, we have no more heuristics that apply, * and must fail. */ if (nunknowns == 0) return NULL; /* failed to select a best candidate */ /* * The next step examines each unknown argument position to see if we can * determine a "type category" for it. If any candidate has an input * datatype of STRING category, use STRING category (this bias towards * STRING is appropriate since unknown-type literals look like strings). * Otherwise, if all the candidates agree on the type category of this * argument position, use that category. Otherwise, fail because we * cannot determine a category. * * If we are able to determine a type category, also notice whether any of * the candidates takes a preferred datatype within the category. * * Having completed this examination, remove candidates that accept the * wrong category at any unknown position. Also, if at least one * candidate accepted a preferred type at a position, remove candidates * that accept non-preferred types. If just one candidate remains, return * that one. However, if this rule turns out to reject all candidates, * keep them all instead. */ resolved_unknowns = false; for (i = 0; i < nargs; i++) { bool have_conflict; if (input_base_typeids[i] != UNKNOWNOID) continue; resolved_unknowns = true; /* assume we can do it */ slot_category[i] = TYPCATEGORY_INVALID; slot_has_preferred_type[i] = false; have_conflict = false; for (current_candidate = candidates; current_candidate != NULL; current_candidate = current_candidate->next) { current_typeids = current_candidate->args; current_type = current_typeids[i]; get_type_category_preferred(current_type, ¤t_category, ¤t_is_preferred); if (slot_category[i] == TYPCATEGORY_INVALID) { /* first candidate */ slot_category[i] = current_category; slot_has_preferred_type[i] = current_is_preferred; } else if (current_category == slot_category[i]) { /* more candidates in same category */ slot_has_preferred_type[i] |= current_is_preferred; } else { /* category conflict! */ if (current_category == TYPCATEGORY_STRING) { /* STRING always wins if available */ slot_category[i] = current_category; slot_has_preferred_type[i] = current_is_preferred; } else { /* * Remember conflict, but keep going (might find STRING) */ have_conflict = true; } } } if (have_conflict && slot_category[i] != TYPCATEGORY_STRING) { /* Failed to resolve category conflict at this position */ resolved_unknowns = false; break; } } if (resolved_unknowns) { /* Strip non-matching candidates */ ncandidates = 0; first_candidate = candidates; last_candidate = NULL; for (current_candidate = candidates; current_candidate != NULL; current_candidate = current_candidate->next) { bool keepit = true; current_typeids = current_candidate->args; for (i = 0; i < nargs; i++) { if (input_base_typeids[i] != UNKNOWNOID) continue; current_type = current_typeids[i]; get_type_category_preferred(current_type, ¤t_category, ¤t_is_preferred); if (current_category != slot_category[i]) { keepit = false; break; } if (slot_has_preferred_type[i] && !current_is_preferred) { keepit = false; break; } } if (keepit) { /* keep this candidate */ last_candidate = current_candidate; ncandidates++; } else { /* forget this candidate */ if (last_candidate) last_candidate->next = current_candidate->next; else first_candidate = current_candidate->next; } } /* if we found any matches, restrict our attention to those */ if (last_candidate) { candidates = first_candidate; /* terminate rebuilt list */ last_candidate->next = NULL; } if (ncandidates == 1) return candidates; } /* * Last gasp: if there are both known- and unknown-type inputs, and all * the known types are the same, assume the unknown inputs are also that * type, and see if that gives us a unique match. If so, use that match. * * NOTE: for a binary operator with one unknown and one non-unknown input, * we already tried this heuristic in binary_oper_exact(). However, that * code only finds exact matches, whereas here we will handle matches that * involve coercion, polymorphic type resolution, etc. */ if (nunknowns < nargs) { Oid known_type = UNKNOWNOID; for (i = 0; i < nargs; i++) { if (input_base_typeids[i] == UNKNOWNOID) continue; if (known_type == UNKNOWNOID) /* first known arg? */ known_type = input_base_typeids[i]; else if (known_type != input_base_typeids[i]) { /* oops, not all match */ known_type = UNKNOWNOID; break; } } if (known_type != UNKNOWNOID) { /* okay, just one known type, apply the heuristic */ for (i = 0; i < nargs; i++) input_base_typeids[i] = known_type; ncandidates = 0; last_candidate = NULL; for (current_candidate = candidates; current_candidate != NULL; current_candidate = current_candidate->next) { current_typeids = current_candidate->args; if (can_coerce_type(nargs, input_base_typeids, current_typeids, COERCION_IMPLICIT)) { if (++ncandidates > 1) break; /* not unique, give up */ last_candidate = current_candidate; } } if (ncandidates == 1) { /* successfully identified a unique match */ last_candidate->next = NULL; return last_candidate; } } } return NULL; /* failed to select a best candidate */ } /* func_select_candidate() */ /* func_get_detail() * * Find the named function in the system catalogs. * * Attempt to find the named function in the system catalogs with * arguments exactly as specified, so that the normal case (exact match) * is as quick as possible. * * If an exact match isn't found: * 1) check for possible interpretation as a type coercion request * 2) apply the ambiguous-function resolution rules * * Return values *funcid through *true_typeids receive info about the function. * If argdefaults isn't NULL, *argdefaults receives a list of any default * argument expressions that need to be added to the given arguments. * * When processing a named- or mixed-notation call (ie, fargnames isn't NIL), * the returned true_typeids and argdefaults are ordered according to the * call's argument ordering: first any positional arguments, then the named * arguments, then defaulted arguments (if needed and allowed by * expand_defaults). Some care is needed if this information is to be compared * to the function's pg_proc entry, but in practice the caller can usually * just work with the call's argument ordering. * * We rely primarily on fargnames/nargs/argtypes as the argument description. * The actual expression node list is passed in fargs so that we can check * for type coercion of a constant. Some callers pass fargs == NIL indicating * they don't need that check made. Note also that when fargnames isn't NIL, * the fargs list must be passed if the caller wants actual argument position * information to be returned into the NamedArgExpr nodes. */ FuncDetailCode func_get_detail(List *funcname, List *fargs, List *fargnames, int nargs, Oid *argtypes, bool expand_variadic, bool expand_defaults, bool include_out_arguments, Oid *funcid, /* return value */ Oid *rettype, /* return value */ bool *retset, /* return value */ int *nvargs, /* return value */ Oid *vatype, /* return value */ Oid **true_typeids, /* return value */ List **argdefaults) /* optional return value */ { FuncCandidateList raw_candidates; FuncCandidateList best_candidate; /* initialize output arguments to silence compiler warnings */ *funcid = InvalidOid; *rettype = InvalidOid; *retset = false; *nvargs = 0; *vatype = InvalidOid; *true_typeids = NULL; if (argdefaults) *argdefaults = NIL; /* Get list of possible candidates from namespace search */ raw_candidates = FuncnameGetCandidates(funcname, nargs, fargnames, expand_variadic, expand_defaults, include_out_arguments, false); /* * Quickly check if there is an exact match to the input datatypes (there * can be only one) */ for (best_candidate = raw_candidates; best_candidate != NULL; best_candidate = best_candidate->next) { /* if nargs==0, argtypes can be null; don't pass that to memcmp */ if (nargs == 0 || memcmp(argtypes, best_candidate->args, nargs * sizeof(Oid)) == 0) break; } if (best_candidate == NULL) { /* * If we didn't find an exact match, next consider the possibility * that this is really a type-coercion request: a single-argument * function call where the function name is a type name. If so, and * if the coercion path is RELABELTYPE or COERCEVIAIO, then go ahead * and treat the "function call" as a coercion. * * This interpretation needs to be given higher priority than * interpretations involving a type coercion followed by a function * call, otherwise we can produce surprising results. For example, we * want "text(varchar)" to be interpreted as a simple coercion, not as * "text(name(varchar))" which the code below this point is entirely * capable of selecting. * * We also treat a coercion of a previously-unknown-type literal * constant to a specific type this way. * * The reason we reject COERCION_PATH_FUNC here is that we expect the * cast implementation function to be named after the target type. * Thus the function will be found by normal lookup if appropriate. * * The reason we reject COERCION_PATH_ARRAYCOERCE is mainly that you * can't write "foo[] (something)" as a function call. In theory * someone might want to invoke it as "_foo (something)" but we have * never supported that historically, so we can insist that people * write it as a normal cast instead. * * We also reject the specific case of COERCEVIAIO for a composite * source type and a string-category target type. This is a case that * find_coercion_pathway() allows by default, but experience has shown * that it's too commonly invoked by mistake. So, again, insist that * people use cast syntax if they want to do that. * * NB: it's important that this code does not exceed what coerce_type * can do, because the caller will try to apply coerce_type if we * return FUNCDETAIL_COERCION. If we return that result for something * coerce_type can't handle, we'll cause infinite recursion between * this module and coerce_type! */ if (nargs == 1 && fargs != NIL && fargnames == NIL) { Oid targetType = FuncNameAsType(funcname); if (OidIsValid(targetType)) { Oid sourceType = argtypes[0]; Node *arg1 = linitial(fargs); bool iscoercion; if (sourceType == UNKNOWNOID && IsA(arg1, Const)) { /* always treat typename('literal') as coercion */ iscoercion = true; } else { CoercionPathType cpathtype; Oid cfuncid; cpathtype = find_coercion_pathway(targetType, sourceType, COERCION_EXPLICIT, &cfuncid); switch (cpathtype) { case COERCION_PATH_RELABELTYPE: iscoercion = true; break; case COERCION_PATH_COERCEVIAIO: if ((sourceType == RECORDOID || ISCOMPLEX(sourceType)) && TypeCategory(targetType) == TYPCATEGORY_STRING) iscoercion = false; else iscoercion = true; break; default: iscoercion = false; break; } } if (iscoercion) { /* Treat it as a type coercion */ *funcid = InvalidOid; *rettype = targetType; *retset = false; *nvargs = 0; *vatype = InvalidOid; *true_typeids = argtypes; return FUNCDETAIL_COERCION; } } } /* * didn't find an exact match, so now try to match up candidates... */ if (raw_candidates != NULL) { FuncCandidateList current_candidates; int ncandidates; ncandidates = func_match_argtypes(nargs, argtypes, raw_candidates, ¤t_candidates); /* one match only? then run with it... */ if (ncandidates == 1) best_candidate = current_candidates; /* * multiple candidates? then better decide or throw an error... */ else if (ncandidates > 1) { best_candidate = func_select_candidate(nargs, argtypes, current_candidates); /* * If we were able to choose a best candidate, we're done. * Otherwise, ambiguous function call. */ if (!best_candidate) return FUNCDETAIL_MULTIPLE; } } } if (best_candidate) { HeapTuple ftup; Form_pg_proc pform; FuncDetailCode result; /* * If processing named args or expanding variadics or defaults, the * "best candidate" might represent multiple equivalently good * functions; treat this case as ambiguous. */ if (!OidIsValid(best_candidate->oid)) return FUNCDETAIL_MULTIPLE; /* * We disallow VARIADIC with named arguments unless the last argument * (the one with VARIADIC attached) actually matched the variadic * parameter. This is mere pedantry, really, but some folks insisted. */ if (fargnames != NIL && !expand_variadic && nargs > 0 && best_candidate->argnumbers[nargs - 1] != nargs - 1) return FUNCDETAIL_NOTFOUND; *funcid = best_candidate->oid; *nvargs = best_candidate->nvargs; *true_typeids = best_candidate->args; /* * If processing named args, return actual argument positions into * NamedArgExpr nodes in the fargs list. This is a bit ugly but not * worth the extra notation needed to do it differently. */ if (best_candidate->argnumbers != NULL) { int i = 0; ListCell *lc; foreach(lc, fargs) { NamedArgExpr *na = (NamedArgExpr *) lfirst(lc); if (IsA(na, NamedArgExpr)) na->argnumber = best_candidate->argnumbers[i]; i++; } } ftup = SearchSysCache1(PROCOID, ObjectIdGetDatum(best_candidate->oid)); if (!HeapTupleIsValid(ftup)) /* should not happen */ elog(ERROR, "cache lookup failed for function %u", best_candidate->oid); pform = (Form_pg_proc) GETSTRUCT(ftup); *rettype = pform->prorettype; *retset = pform->proretset; *vatype = pform->provariadic; /* fetch default args if caller wants 'em */ if (argdefaults && best_candidate->ndargs > 0) { Datum proargdefaults; bool isnull; char *str; List *defaults; /* shouldn't happen, FuncnameGetCandidates messed up */ if (best_candidate->ndargs > pform->pronargdefaults) elog(ERROR, "not enough default arguments"); proargdefaults = SysCacheGetAttr(PROCOID, ftup, Anum_pg_proc_proargdefaults, &isnull); Assert(!isnull); str = TextDatumGetCString(proargdefaults); defaults = castNode(List, stringToNode(str)); pfree(str); /* Delete any unused defaults from the returned list */ if (best_candidate->argnumbers != NULL) { /* * This is a bit tricky in named notation, since the supplied * arguments could replace any subset of the defaults. We * work by making a bitmapset of the argnumbers of defaulted * arguments, then scanning the defaults list and selecting * the needed items. (This assumes that defaulted arguments * should be supplied in their positional order.) */ Bitmapset *defargnumbers; int *firstdefarg; List *newdefaults; ListCell *lc; int i; defargnumbers = NULL; firstdefarg = &best_candidate->argnumbers[best_candidate->nargs - best_candidate->ndargs]; for (i = 0; i < best_candidate->ndargs; i++) defargnumbers = bms_add_member(defargnumbers, firstdefarg[i]); newdefaults = NIL; i = best_candidate->nominalnargs - pform->pronargdefaults; foreach(lc, defaults) { if (bms_is_member(i, defargnumbers)) newdefaults = lappend(newdefaults, lfirst(lc)); i++; } Assert(list_length(newdefaults) == best_candidate->ndargs); bms_free(defargnumbers); *argdefaults = newdefaults; } else { /* * Defaults for positional notation are lots easier; just * remove any unwanted ones from the front. */ int ndelete; ndelete = list_length(defaults) - best_candidate->ndargs; if (ndelete > 0) defaults = list_delete_first_n(defaults, ndelete); *argdefaults = defaults; } } switch (pform->prokind) { case PROKIND_AGGREGATE: result = FUNCDETAIL_AGGREGATE; break; case PROKIND_FUNCTION: result = FUNCDETAIL_NORMAL; break; case PROKIND_PROCEDURE: result = FUNCDETAIL_PROCEDURE; break; case PROKIND_WINDOW: result = FUNCDETAIL_WINDOWFUNC; break; default: elog(ERROR, "unrecognized prokind: %c", pform->prokind); result = FUNCDETAIL_NORMAL; /* keep compiler quiet */ break; } ReleaseSysCache(ftup); return result; } return FUNCDETAIL_NOTFOUND; } /* * unify_hypothetical_args() * * Ensure that each hypothetical direct argument of a hypothetical-set * aggregate has the same type as the corresponding aggregated argument. * Modify the expressions in the fargs list, if necessary, and update * actual_arg_types[]. * * If the agg declared its args non-ANY (even ANYELEMENT), we need only a * sanity check that the declared types match; make_fn_arguments will coerce * the actual arguments to match the declared ones. But if the declaration * is ANY, nothing will happen in make_fn_arguments, so we need to fix any * mismatch here. We use the same type resolution logic as UNION etc. */ static void unify_hypothetical_args(ParseState *pstate, List *fargs, int numAggregatedArgs, Oid *actual_arg_types, Oid *declared_arg_types) { int numDirectArgs, numNonHypotheticalArgs; int hargpos; numDirectArgs = list_length(fargs) - numAggregatedArgs; numNonHypotheticalArgs = numDirectArgs - numAggregatedArgs; /* safety check (should only trigger with a misdeclared agg) */ if (numNonHypotheticalArgs < 0) elog(ERROR, "incorrect number of arguments to hypothetical-set aggregate"); /* Check each hypothetical arg and corresponding aggregated arg */ for (hargpos = numNonHypotheticalArgs; hargpos < numDirectArgs; hargpos++) { int aargpos = numDirectArgs + (hargpos - numNonHypotheticalArgs); ListCell *harg = list_nth_cell(fargs, hargpos); ListCell *aarg = list_nth_cell(fargs, aargpos); Oid commontype; int32 commontypmod; /* A mismatch means AggregateCreate didn't check properly ... */ if (declared_arg_types[hargpos] != declared_arg_types[aargpos]) elog(ERROR, "hypothetical-set aggregate has inconsistent declared argument types"); /* No need to unify if make_fn_arguments will coerce */ if (declared_arg_types[hargpos] != ANYOID) continue; /* * Select common type, giving preference to the aggregated argument's * type (we'd rather coerce the direct argument once than coerce all * the aggregated values). */ commontype = select_common_type(pstate, list_make2(lfirst(aarg), lfirst(harg)), "WITHIN GROUP", NULL); commontypmod = select_common_typmod(pstate, list_make2(lfirst(aarg), lfirst(harg)), commontype); /* * Perform the coercions. We don't need to worry about NamedArgExprs * here because they aren't supported with aggregates. */ lfirst(harg) = coerce_type(pstate, (Node *) lfirst(harg), actual_arg_types[hargpos], commontype, commontypmod, COERCION_IMPLICIT, COERCE_IMPLICIT_CAST, -1); actual_arg_types[hargpos] = commontype; lfirst(aarg) = coerce_type(pstate, (Node *) lfirst(aarg), actual_arg_types[aargpos], commontype, commontypmod, COERCION_IMPLICIT, COERCE_IMPLICIT_CAST, -1); actual_arg_types[aargpos] = commontype; } } /* * make_fn_arguments() * * Given the actual argument expressions for a function, and the desired * input types for the function, add any necessary typecasting to the * expression tree. Caller should already have verified that casting is * allowed. * * Caution: given argument list is modified in-place. * * As with coerce_type, pstate may be NULL if no special unknown-Param * processing is wanted. */ void make_fn_arguments(ParseState *pstate, List *fargs, Oid *actual_arg_types, Oid *declared_arg_types) { ListCell *current_fargs; int i = 0; foreach(current_fargs, fargs) { /* types don't match? then force coercion using a function call... */ if (actual_arg_types[i] != declared_arg_types[i]) { Node *node = (Node *) lfirst(current_fargs); /* * If arg is a NamedArgExpr, coerce its input expr instead --- we * want the NamedArgExpr to stay at the top level of the list. */ if (IsA(node, NamedArgExpr)) { NamedArgExpr *na = (NamedArgExpr *) node; node = coerce_type(pstate, (Node *) na->arg, actual_arg_types[i], declared_arg_types[i], -1, COERCION_IMPLICIT, COERCE_IMPLICIT_CAST, -1); na->arg = (Expr *) node; } else { node = coerce_type(pstate, node, actual_arg_types[i], declared_arg_types[i], -1, COERCION_IMPLICIT, COERCE_IMPLICIT_CAST, -1); lfirst(current_fargs) = node; } } i++; } } /* * FuncNameAsType - * convenience routine to see if a function name matches a type name * * Returns the OID of the matching type, or InvalidOid if none. We ignore * shell types and complex types. */ static Oid FuncNameAsType(List *funcname) { Oid result; Type typtup; /* * temp_ok=false protects the * contract for writing SECURITY DEFINER functions safely. */ typtup = LookupTypeNameExtended(NULL, makeTypeNameFromNameList(funcname), NULL, false, false); if (typtup == NULL) return InvalidOid; if (((Form_pg_type) GETSTRUCT(typtup))->typisdefined && !OidIsValid(typeTypeRelid(typtup))) result = typeTypeId(typtup); else result = InvalidOid; ReleaseSysCache(typtup); return result; } /* * ParseComplexProjection - * handles function calls with a single argument that is of complex type. * If the function call is actually a column projection, return a suitably * transformed expression tree. If not, return NULL. */ static Node * ParseComplexProjection(ParseState *pstate, const char *funcname, Node *first_arg, int location) { TupleDesc tupdesc; int i; /* * Special case for whole-row Vars so that we can resolve (foo.*).bar even * when foo is a reference to a subselect, join, or RECORD function. A * bonus is that we avoid generating an unnecessary FieldSelect; our * result can omit the whole-row Var and just be a Var for the selected * field. * * This case could be handled by expandRecordVariable, but it's more * efficient to do it this way when possible. */ if (IsA(first_arg, Var) && ((Var *) first_arg)->varattno == InvalidAttrNumber) { ParseNamespaceItem *nsitem; nsitem = GetNSItemByRangeTablePosn(pstate, ((Var *) first_arg)->varno, ((Var *) first_arg)->varlevelsup); /* Return a Var if funcname matches a column, else NULL */ return scanNSItemForColumn(pstate, nsitem, ((Var *) first_arg)->varlevelsup, funcname, location); } /* * Else do it the hard way with get_expr_result_tupdesc(). * * If it's a Var of type RECORD, we have to work even harder: we have to * find what the Var refers to, and pass that to get_expr_result_tupdesc. * That task is handled by expandRecordVariable(). */ if (IsA(first_arg, Var) && ((Var *) first_arg)->vartype == RECORDOID) tupdesc = expandRecordVariable(pstate, (Var *) first_arg, 0); else tupdesc = get_expr_result_tupdesc(first_arg, true); if (!tupdesc) return NULL; /* unresolvable RECORD type */ for (i = 0; i < tupdesc->natts; i++) { Form_pg_attribute att = TupleDescAttr(tupdesc, i); if (strcmp(funcname, NameStr(att->attname)) == 0 && !att->attisdropped) { /* Success, so generate a FieldSelect expression */ FieldSelect *fselect = makeNode(FieldSelect); fselect->arg = (Expr *) first_arg; fselect->fieldnum = i + 1; fselect->resulttype = att->atttypid; fselect->resulttypmod = att->atttypmod; /* save attribute's collation for parse_collate.c */ fselect->resultcollid = att->attcollation; return (Node *) fselect; } } return NULL; /* funcname does not match any column */ } /* * funcname_signature_string * Build a string representing a function name, including arg types. * The result is something like "foo(integer)". * * If argnames isn't NIL, it is a list of C strings representing the actual * arg names for the last N arguments. This must be considered part of the * function signature too, when dealing with named-notation function calls. * * This is typically used in the construction of function-not-found error * messages. */ const char * funcname_signature_string(const char *funcname, int nargs, List *argnames, const Oid *argtypes) { StringInfoData argbuf; int numposargs; ListCell *lc; int i; initStringInfo(&argbuf); appendStringInfo(&argbuf, "%s(", funcname); numposargs = nargs - list_length(argnames); lc = list_head(argnames); for (i = 0; i < nargs; i++) { if (i) appendStringInfoString(&argbuf, ", "); if (i >= numposargs) { appendStringInfo(&argbuf, "%s => ", (char *) lfirst(lc)); lc = lnext(argnames, lc); } appendStringInfoString(&argbuf, format_type_be(argtypes[i])); } appendStringInfoChar(&argbuf, ')'); return argbuf.data; /* return palloc'd string buffer */ } /* * func_signature_string * As above, but function name is passed as a qualified name list. */ const char * func_signature_string(List *funcname, int nargs, List *argnames, const Oid *argtypes) { return funcname_signature_string(NameListToString(funcname), nargs, argnames, argtypes); } /* * LookupFuncNameInternal * Workhorse for LookupFuncName/LookupFuncWithArgs * * In an error situation, e.g. can't find the function, then we return * InvalidOid and set *lookupError to indicate what went wrong. * * Possible errors: * FUNCLOOKUP_NOSUCHFUNC: we can't find a function of this name. * FUNCLOOKUP_AMBIGUOUS: more than one function matches. */ static Oid LookupFuncNameInternal(ObjectType objtype, List *funcname, int nargs, const Oid *argtypes, bool include_out_arguments, bool missing_ok, FuncLookupError *lookupError) { Oid result = InvalidOid; FuncCandidateList clist; /* NULL argtypes allowed for nullary functions only */ Assert(argtypes != NULL || nargs == 0); /* Always set *lookupError, to forestall uninitialized-variable warnings */ *lookupError = FUNCLOOKUP_NOSUCHFUNC; /* Get list of candidate objects */ clist = FuncnameGetCandidates(funcname, nargs, NIL, false, false, include_out_arguments, missing_ok); /* Scan list for a match to the arg types (if specified) and the objtype */ for (; clist != NULL; clist = clist->next) { /* Check arg type match, if specified */ if (nargs >= 0) { /* if nargs==0, argtypes can be null; don't pass that to memcmp */ if (nargs > 0 && memcmp(argtypes, clist->args, nargs * sizeof(Oid)) != 0) continue; } /* Check for duplicates reported by FuncnameGetCandidates */ if (!OidIsValid(clist->oid)) { *lookupError = FUNCLOOKUP_AMBIGUOUS; return InvalidOid; } /* Check objtype match, if specified */ switch (objtype) { case OBJECT_FUNCTION: case OBJECT_AGGREGATE: /* Ignore procedures */ if (get_func_prokind(clist->oid) == PROKIND_PROCEDURE) continue; break; case OBJECT_PROCEDURE: /* Ignore non-procedures */ if (get_func_prokind(clist->oid) != PROKIND_PROCEDURE) continue; break; case OBJECT_ROUTINE: /* no restriction */ break; default: Assert(false); } /* Check for multiple matches */ if (OidIsValid(result)) { *lookupError = FUNCLOOKUP_AMBIGUOUS; return InvalidOid; } /* OK, we have a candidate */ result = clist->oid; } return result; } /* * LookupFuncName * * Given a possibly-qualified function name and optionally a set of argument * types, look up the function. Pass nargs == -1 to indicate that the number * and types of the arguments are unspecified (this is NOT the same as * specifying that there are no arguments). * * If the function name is not schema-qualified, it is sought in the current * namespace search path. * * If the function is not found, we return InvalidOid if missing_ok is true, * else raise an error. * * If nargs == -1 and multiple functions are found matching this function name * we will raise an ambiguous-function error, regardless of what missing_ok is * set to. * * Only functions will be found; procedures will be ignored even if they * match the name and argument types. (However, we don't trouble to reject * aggregates or window functions here.) */ Oid LookupFuncName(List *funcname, int nargs, const Oid *argtypes, bool missing_ok) { Oid funcoid; FuncLookupError lookupError; funcoid = LookupFuncNameInternal(OBJECT_FUNCTION, funcname, nargs, argtypes, false, missing_ok, &lookupError); if (OidIsValid(funcoid)) return funcoid; switch (lookupError) { case FUNCLOOKUP_NOSUCHFUNC: /* Let the caller deal with it when missing_ok is true */ if (missing_ok) return InvalidOid; if (nargs < 0) ereport(ERROR, (errcode(ERRCODE_UNDEFINED_FUNCTION), errmsg("could not find a function named \"%s\"", NameListToString(funcname)))); else ereport(ERROR, (errcode(ERRCODE_UNDEFINED_FUNCTION), errmsg("function %s does not exist", func_signature_string(funcname, nargs, NIL, argtypes)))); break; case FUNCLOOKUP_AMBIGUOUS: /* Raise an error regardless of missing_ok */ ereport(ERROR, (errcode(ERRCODE_AMBIGUOUS_FUNCTION), errmsg("function name \"%s\" is not unique", NameListToString(funcname)), errhint("Specify the argument list to select the function unambiguously."))); break; } return InvalidOid; /* Keep compiler quiet */ } /* * LookupFuncWithArgs * * Like LookupFuncName, but the argument types are specified by an * ObjectWithArgs node. Also, this function can check whether the result is a * function, procedure, or aggregate, based on the objtype argument. Pass * OBJECT_ROUTINE to accept any of them. * * For historical reasons, we also accept aggregates when looking for a * function. * * When missing_ok is true we don't generate any error for missing objects and * return InvalidOid. Other types of errors can still be raised, regardless * of the value of missing_ok. */ Oid LookupFuncWithArgs(ObjectType objtype, ObjectWithArgs *func, bool missing_ok) { Oid argoids[FUNC_MAX_ARGS]; int argcount; int nargs; int i; ListCell *args_item; Oid oid; FuncLookupError lookupError; Assert(objtype == OBJECT_AGGREGATE || objtype == OBJECT_FUNCTION || objtype == OBJECT_PROCEDURE || objtype == OBJECT_ROUTINE); argcount = list_length(func->objargs); if (argcount > FUNC_MAX_ARGS) { if (objtype == OBJECT_PROCEDURE) ereport(ERROR, (errcode(ERRCODE_TOO_MANY_ARGUMENTS), errmsg_plural("procedures cannot have more than %d argument", "procedures cannot have more than %d arguments", FUNC_MAX_ARGS, FUNC_MAX_ARGS))); else ereport(ERROR, (errcode(ERRCODE_TOO_MANY_ARGUMENTS), errmsg_plural("functions cannot have more than %d argument", "functions cannot have more than %d arguments", FUNC_MAX_ARGS, FUNC_MAX_ARGS))); } /* * First, perform a lookup considering only input arguments (traditional * Postgres rules). */ i = 0; foreach(args_item, func->objargs) { TypeName *t = lfirst_node(TypeName, args_item); argoids[i] = LookupTypeNameOid(NULL, t, missing_ok); if (!OidIsValid(argoids[i])) return InvalidOid; /* missing_ok must be true */ i++; } /* * Set nargs for LookupFuncNameInternal. It expects -1 to mean no args * were specified. */ nargs = func->args_unspecified ? -1 : argcount; /* * In args_unspecified mode, also tell LookupFuncNameInternal to consider * the object type, since there seems no reason not to. However, if we * have an argument list, disable the objtype check, because we'd rather * complain about "object is of wrong type" than "object doesn't exist". * (Note that with args, FuncnameGetCandidates will have ensured there's * only one argtype match, so we're not risking an ambiguity failure via * this choice.) */ oid = LookupFuncNameInternal(func->args_unspecified ? objtype : OBJECT_ROUTINE, func->objname, nargs, argoids, false, missing_ok, &lookupError); /* * If PROCEDURE or ROUTINE was specified, and we have an argument list * that contains no parameter mode markers, and we didn't already discover * that there's ambiguity, perform a lookup considering all arguments. * (Note: for a zero-argument procedure, or in args_unspecified mode, the * normal lookup is sufficient; so it's OK to require non-NIL objfuncargs * to perform this lookup.) */ if ((objtype == OBJECT_PROCEDURE || objtype == OBJECT_ROUTINE) && func->objfuncargs != NIL && lookupError != FUNCLOOKUP_AMBIGUOUS) { bool have_param_mode = false; /* * Check for non-default parameter mode markers. If there are any, * then the command does not conform to SQL-spec syntax, so we may * assume that the traditional Postgres lookup method of considering * only input parameters is sufficient. (Note that because the spec * doesn't have OUT arguments for functions, we also don't need this * hack in FUNCTION or AGGREGATE mode.) */ foreach(args_item, func->objfuncargs) { FunctionParameter *fp = lfirst_node(FunctionParameter, args_item); if (fp->mode != FUNC_PARAM_DEFAULT) { have_param_mode = true; break; } } if (!have_param_mode) { Oid poid; /* Without mode marks, objargs surely includes all params */ Assert(list_length(func->objfuncargs) == argcount); /* For objtype == OBJECT_PROCEDURE, we can ignore non-procedures */ poid = LookupFuncNameInternal(objtype, func->objname, argcount, argoids, true, missing_ok, &lookupError); /* Combine results, handling ambiguity */ if (OidIsValid(poid)) { if (OidIsValid(oid) && oid != poid) { /* oops, we got hits both ways, on different objects */ oid = InvalidOid; lookupError = FUNCLOOKUP_AMBIGUOUS; } else oid = poid; } else if (lookupError == FUNCLOOKUP_AMBIGUOUS) oid = InvalidOid; } } if (OidIsValid(oid)) { /* * Even if we found the function, perform validation that the objtype * matches the prokind of the found function. For historical reasons * we allow the objtype of FUNCTION to include aggregates and window * functions; but we draw the line if the object is a procedure. That * is a new enough feature that this historical rule does not apply. * * (This check is partially redundant with the objtype check in * LookupFuncNameInternal; but not entirely, since we often don't tell * LookupFuncNameInternal to apply that check at all.) */ switch (objtype) { case OBJECT_FUNCTION: /* Only complain if it's a procedure. */ if (get_func_prokind(oid) == PROKIND_PROCEDURE) ereport(ERROR, (errcode(ERRCODE_WRONG_OBJECT_TYPE), errmsg("%s is not a function", func_signature_string(func->objname, argcount, NIL, argoids)))); break; case OBJECT_PROCEDURE: /* Reject if found object is not a procedure. */ if (get_func_prokind(oid) != PROKIND_PROCEDURE) ereport(ERROR, (errcode(ERRCODE_WRONG_OBJECT_TYPE), errmsg("%s is not a procedure", func_signature_string(func->objname, argcount, NIL, argoids)))); break; case OBJECT_AGGREGATE: /* Reject if found object is not an aggregate. */ if (get_func_prokind(oid) != PROKIND_AGGREGATE) ereport(ERROR, (errcode(ERRCODE_WRONG_OBJECT_TYPE), errmsg("function %s is not an aggregate", func_signature_string(func->objname, argcount, NIL, argoids)))); break; default: /* OBJECT_ROUTINE accepts anything. */ break; } return oid; /* All good */ } else { /* Deal with cases where the lookup failed */ switch (lookupError) { case FUNCLOOKUP_NOSUCHFUNC: /* Suppress no-such-func errors when missing_ok is true */ if (missing_ok) break; switch (objtype) { case OBJECT_PROCEDURE: if (func->args_unspecified) ereport(ERROR, (errcode(ERRCODE_UNDEFINED_FUNCTION), errmsg("could not find a procedure named \"%s\"", NameListToString(func->objname)))); else ereport(ERROR, (errcode(ERRCODE_UNDEFINED_FUNCTION), errmsg("procedure %s does not exist", func_signature_string(func->objname, argcount, NIL, argoids)))); break; case OBJECT_AGGREGATE: if (func->args_unspecified) ereport(ERROR, (errcode(ERRCODE_UNDEFINED_FUNCTION), errmsg("could not find an aggregate named \"%s\"", NameListToString(func->objname)))); else if (argcount == 0) ereport(ERROR, (errcode(ERRCODE_UNDEFINED_FUNCTION), errmsg("aggregate %s(*) does not exist", NameListToString(func->objname)))); else ereport(ERROR, (errcode(ERRCODE_UNDEFINED_FUNCTION), errmsg("aggregate %s does not exist", func_signature_string(func->objname, argcount, NIL, argoids)))); break; default: /* FUNCTION and ROUTINE */ if (func->args_unspecified) ereport(ERROR, (errcode(ERRCODE_UNDEFINED_FUNCTION), errmsg("could not find a function named \"%s\"", NameListToString(func->objname)))); else ereport(ERROR, (errcode(ERRCODE_UNDEFINED_FUNCTION), errmsg("function %s does not exist", func_signature_string(func->objname, argcount, NIL, argoids)))); break; } break; case FUNCLOOKUP_AMBIGUOUS: switch (objtype) { case OBJECT_FUNCTION: ereport(ERROR, (errcode(ERRCODE_AMBIGUOUS_FUNCTION), errmsg("function name \"%s\" is not unique", NameListToString(func->objname)), func->args_unspecified ? errhint("Specify the argument list to select the function unambiguously.") : 0)); break; case OBJECT_PROCEDURE: ereport(ERROR, (errcode(ERRCODE_AMBIGUOUS_FUNCTION), errmsg("procedure name \"%s\" is not unique", NameListToString(func->objname)), func->args_unspecified ? errhint("Specify the argument list to select the procedure unambiguously.") : 0)); break; case OBJECT_AGGREGATE: ereport(ERROR, (errcode(ERRCODE_AMBIGUOUS_FUNCTION), errmsg("aggregate name \"%s\" is not unique", NameListToString(func->objname)), func->args_unspecified ? errhint("Specify the argument list to select the aggregate unambiguously.") : 0)); break; case OBJECT_ROUTINE: ereport(ERROR, (errcode(ERRCODE_AMBIGUOUS_FUNCTION), errmsg("routine name \"%s\" is not unique", NameListToString(func->objname)), func->args_unspecified ? errhint("Specify the argument list to select the routine unambiguously.") : 0)); break; default: Assert(false); /* Disallowed by Assert above */ break; } break; } return InvalidOid; } } /* * check_srf_call_placement * Verify that a set-returning function is called in a valid place, * and throw a nice error if not. * * A side-effect is to set pstate->p_hasTargetSRFs true if appropriate. * * last_srf should be a copy of pstate->p_last_srf from just before we * started transforming the function's arguments. This allows detection * of whether the SRF's arguments contain any SRFs. */ void check_srf_call_placement(ParseState *pstate, Node *last_srf, int location) { const char *err; bool errkind; /* * Check to see if the set-returning function is in an invalid place * within the query. Basically, we don't allow SRFs anywhere except in * the targetlist (which includes GROUP BY/ORDER BY expressions), VALUES, * and functions in FROM. * * For brevity we support two schemes for reporting an error here: set * "err" to a custom message, or set "errkind" true if the error context * is sufficiently identified by what ParseExprKindName will return, *and* * what it will return is just a SQL keyword. (Otherwise, use a custom * message to avoid creating translation problems.) */ err = NULL; errkind = false; switch (pstate->p_expr_kind) { case EXPR_KIND_NONE: Assert(false); /* can't happen */ break; case EXPR_KIND_OTHER: /* Accept SRF here; caller must throw error if wanted */ break; case EXPR_KIND_JOIN_ON: case EXPR_KIND_JOIN_USING: err = _("set-returning functions are not allowed in JOIN conditions"); break; case EXPR_KIND_FROM_SUBSELECT: /* can't get here, but just in case, throw an error */ errkind = true; break; case EXPR_KIND_FROM_FUNCTION: /* okay, but we don't allow nested SRFs here */ /* errmsg is chosen to match transformRangeFunction() */ /* errposition should point to the inner SRF */ if (pstate->p_last_srf != last_srf) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), errmsg("set-returning functions must appear at top level of FROM"), parser_errposition(pstate, exprLocation(pstate->p_last_srf)))); break; case EXPR_KIND_WHERE: errkind = true; break; case EXPR_KIND_POLICY: err = _("set-returning functions are not allowed in policy expressions"); break; case EXPR_KIND_HAVING: errkind = true; break; case EXPR_KIND_FILTER: errkind = true; break; case EXPR_KIND_WINDOW_PARTITION: case EXPR_KIND_WINDOW_ORDER: /* okay, these are effectively GROUP BY/ORDER BY */ pstate->p_hasTargetSRFs = true; break; case EXPR_KIND_WINDOW_FRAME_RANGE: case EXPR_KIND_WINDOW_FRAME_ROWS: case EXPR_KIND_WINDOW_FRAME_GROUPS: err = _("set-returning functions are not allowed in window definitions"); break; case EXPR_KIND_SELECT_TARGET: case EXPR_KIND_INSERT_TARGET: /* okay */ pstate->p_hasTargetSRFs = true; break; case EXPR_KIND_UPDATE_SOURCE: case EXPR_KIND_UPDATE_TARGET: /* disallowed because it would be ambiguous what to do */ errkind = true; break; case EXPR_KIND_GROUP_BY: case EXPR_KIND_ORDER_BY: /* okay */ pstate->p_hasTargetSRFs = true; break; case EXPR_KIND_DISTINCT_ON: /* okay */ pstate->p_hasTargetSRFs = true; break; case EXPR_KIND_LIMIT: case EXPR_KIND_OFFSET: errkind = true; break; case EXPR_KIND_RETURNING: errkind = true; break; case EXPR_KIND_VALUES: /* SRFs are presently not supported by nodeValuesscan.c */ errkind = true; break; case EXPR_KIND_VALUES_SINGLE: /* okay, since we process this like a SELECT tlist */ pstate->p_hasTargetSRFs = true; break; case EXPR_KIND_CHECK_CONSTRAINT: case EXPR_KIND_DOMAIN_CHECK: err = _("set-returning functions are not allowed in check constraints"); break; case EXPR_KIND_COLUMN_DEFAULT: case EXPR_KIND_FUNCTION_DEFAULT: err = _("set-returning functions are not allowed in DEFAULT expressions"); break; case EXPR_KIND_INDEX_EXPRESSION: err = _("set-returning functions are not allowed in index expressions"); break; case EXPR_KIND_INDEX_PREDICATE: err = _("set-returning functions are not allowed in index predicates"); break; case EXPR_KIND_STATS_EXPRESSION: err = _("set-returning functions are not allowed in statistics expressions"); break; case EXPR_KIND_ALTER_COL_TRANSFORM: err = _("set-returning functions are not allowed in transform expressions"); break; case EXPR_KIND_EXECUTE_PARAMETER: err = _("set-returning functions are not allowed in EXECUTE parameters"); break; case EXPR_KIND_TRIGGER_WHEN: err = _("set-returning functions are not allowed in trigger WHEN conditions"); break; case EXPR_KIND_PARTITION_BOUND: err = _("set-returning functions are not allowed in partition bound"); break; case EXPR_KIND_PARTITION_EXPRESSION: err = _("set-returning functions are not allowed in partition key expressions"); break; case EXPR_KIND_CALL_ARGUMENT: err = _("set-returning functions are not allowed in CALL arguments"); break; case EXPR_KIND_COPY_WHERE: err = _("set-returning functions are not allowed in COPY FROM WHERE conditions"); break; case EXPR_KIND_GENERATED_COLUMN: err = _("set-returning functions are not allowed in column generation expressions"); break; case EXPR_KIND_CYCLE_MARK: errkind = true; break; /* * There is intentionally no default: case here, so that the * compiler will warn if we add a new ParseExprKind without * extending this switch. If we do see an unrecognized value at * runtime, the behavior will be the same as for EXPR_KIND_OTHER, * which is sane anyway. */ } if (err) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), errmsg_internal("%s", err), parser_errposition(pstate, location))); if (errkind) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), /* translator: %s is name of a SQL construct, eg GROUP BY */ errmsg("set-returning functions are not allowed in %s", ParseExprKindName(pstate->p_expr_kind)), parser_errposition(pstate, location))); }