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Improve the error message for an inappropriate column definition list.

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The existing message about "a column definition list is only allowed for
functions returning "record"" could be given in some cases where it was
fairly confusing; in particular, a function with multiple OUT parameters
*does* return record according to pg_proc.  Break it down into a couple
more cases to deliver a more on-point complaint.  Per complaint from
Bruce Momjian.

Discussion: https://postgr.es/m/798909.1600562993@sss.pgh.pa.us
This commit is contained in:
Tom Lane
2020-09-22 10:49:11 -04:00
parent f859c2ffa0
commit ce90f075f0
3 changed files with 55 additions and 7 deletions
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44
src/backend/parser/parse_relation.c
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@ -1737,16 +1737,46 @@ addRangeTableEntryForFunction(ParseState *pstate,
/*
* A coldeflist is required if the function returns RECORD and hasn't
* got a predetermined record type, and is prohibited otherwise.
* got a predetermined record type, and is prohibited otherwise. This
* can be a bit confusing, so we expend some effort on delivering a
* relevant error message.
*/
if (coldeflist != NIL)
{
if (functypclass != TYPEFUNC_RECORD)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("a column definition list is only allowed for functions returning \"record\""),
parser_errposition(pstate,
exprLocation((Node *) coldeflist))));
switch (functypclass)
{
case TYPEFUNC_RECORD:
/* ok */
break;
case TYPEFUNC_COMPOSITE:
case TYPEFUNC_COMPOSITE_DOMAIN:
/*
* If the function's raw result type is RECORD, we must
* have resolved it using its OUT parameters. Otherwise,
* it must have a named composite type.
*/
if (exprType(funcexpr) == RECORDOID)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("a column definition list is redundant for a function with OUT parameters"),
parser_errposition(pstate,
exprLocation((Node *) coldeflist))));
else
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("a column definition list is redundant for a function returning a named composite type"),
parser_errposition(pstate,
exprLocation((Node *) coldeflist))));
break;
default:
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("a column definition list is only allowed for functions returning \"record\""),
parser_errposition(pstate,
exprLocation((Node *) coldeflist))));
break;
}
}
else
{