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Remove ancient restriction that LIMIT/OFFSET can't contain a sub-select.

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This was probably protecting some implementation limitation when it was
put in, but as far as I can tell the planner and executor have no such
assumption anymore; the case seems to work fine.  Per a gripe from
Grzegorz Jaskiewicz.
This commit is contained in:
Tom Lane 2008-02-15 17:19:46 +00:00
parent efac2796e6
commit cc80f0a340
1 changed files with 2 additions and 12 deletions
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14
src/backend/parser/parse_clause.c
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@ -8,7 +8,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/parse_clause.c,v 1.168 2008/01/01 19:45:50 momjian Exp $ * $PostgreSQL: pgsql/src/backend/parser/parse_clause.c,v 1.169 2008/02/15 17:19:46 tgl Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -1091,9 +1091,7 @@ transformLimitClause(ParseState *pstate, Node *clause,
qual = coerce_to_specific_type(pstate, qual, INT8OID, constructName); qual = coerce_to_specific_type(pstate, qual, INT8OID, constructName);
/* /*
* LIMIT can't refer to any vars or aggregates of the current query; we * LIMIT can't refer to any vars or aggregates of the current query
* don't allow subselects either (though that case would at least be
* sensible)
*/ */
if (contain_vars_of_level(qual, 0)) if (contain_vars_of_level(qual, 0))
{ {
@ -1111,14 +1109,6 @@ transformLimitClause(ParseState *pstate, Node *clause,
errmsg("argument of %s must not contain aggregates", errmsg("argument of %s must not contain aggregates",
constructName))); constructName)));
} }
if (contain_subplans(qual))
{
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
/* translator: %s is name of a SQL construct, eg LIMIT */
errmsg("argument of %s must not contain subqueries",
constructName)));
}
return qual; return qual;
} }