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Generate a reasonable error message when an aggregate function is applied

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to an undecorated relation name (cf. example from Ed Loehr, 5/25/00).
This commit is contained in:
Tom Lane 2000-05-26 03:56:40 +00:00
parent cf169e0088
commit 8bba4b4e0e
1 changed files with 34 additions and 21 deletions
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47
src/backend/parser/parse_func.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/parse_func.c,v 1.78 2000/04/12 17:15:26 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/parse_func.c,v 1.79 2000/05/26 03:56:40 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -271,6 +271,7 @@ ParseFuncOrColumn(ParseState *pstate, char *funcname, List *fargs,
Node *retval;
bool retset;
bool must_be_agg = agg_star || agg_distinct;
bool could_be_agg;
bool attisset = false;
Oid toid = InvalidOid;
Expr *expr;
@ -413,28 +414,31 @@ ParseFuncOrColumn(ParseState *pstate, char *funcname, List *fargs,
}
}
if (nargs == 1 || must_be_agg)
{
/*
* See if it's an aggregate.
*/
Oid basetype;
int ncandidates;
CandidateList candidates;
if (must_be_agg)
{
/* We don't presently cope with, eg, foo(DISTINCT x,y) */
if (nargs != 1)
elog(ERROR, "Aggregate functions may only have one parameter");
/*
* the aggregate COUNT is a special case, ignore its base type.
* Treat it as zero. XXX mighty ugly --- FIXME
*/
if (strcmp(funcname, "count") == 0)
basetype = 0;
/* Agg's argument can't be a relation name, either */
if (IsA(first_arg, Ident) && ((Ident *) first_arg)->isRel)
elog(ERROR, "Aggregate functions cannot be applied to relation names");
could_be_agg = true;
}
else
basetype = exprType(lfirst(fargs));
{
/* Try to parse as an aggregate if above-mentioned checks are OK */
could_be_agg = (nargs == 1) &&
!(IsA(first_arg, Ident) && ((Ident *) first_arg)->isRel);
}
if (could_be_agg)
{
Oid basetype = exprType(lfirst(fargs));
int ncandidates;
CandidateList candidates;
/* try for exact match first... */
if (SearchSysCacheTuple(AGGNAME,
@ -445,9 +449,18 @@ ParseFuncOrColumn(ParseState *pstate, char *funcname, List *fargs,
fargs, agg_star, agg_distinct,
precedence);
/* check for aggregate-that-accepts-any-type (eg, COUNT) */
if (SearchSysCacheTuple(AGGNAME,
PointerGetDatum(funcname),
ObjectIdGetDatum(0),
0, 0))
return (Node *) ParseAgg(pstate, funcname, 0,
fargs, agg_star, agg_distinct,
precedence);
/*
* No exact match yet, so see if there is another entry in the
* aggregate table which is compatible. - thomas 1998-12-05
* aggregate table that is compatible. - thomas 1998-12-05
*/
ncandidates = agg_get_candidates(funcname, basetype, &candidates);
if (ncandidates > 0)