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Make the behavior of HAVING without GROUP BY conform to the SQL spec.

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Formerly, if such a clause contained no aggregate functions we mistakenly
treated it as equivalent to WHERE.  Per spec it must cause the query to
be treated as a grouped query of a single group, the same as appearance
of aggregate functions would do.  Also, the HAVING filter must execute
after aggregate function computation even if it itself contains no
aggregate functions.
This commit is contained in:
Tom Lane
2005-03-10 23:21:26 +00:00
parent 609e32b929
commit 595ed2a855
20 changed files with 385 additions and 238 deletions
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11
src/backend/parser/analyze.c
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@@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/backend/parser/analyze.c,v 1.315 2005/02/19 19:33:08 tgl Exp $
* $PostgreSQL: pgsql/src/backend/parser/analyze.c,v 1.316 2005/03/10 23:21:23 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -1854,7 +1854,6 @@ transformSelectStmt(ParseState *pstate, SelectStmt *stmt)
/*
* Initial processing of HAVING clause is just like WHERE clause.
* Additional work will be done in optimizer/plan/planner.c.
*/
qry->havingQual = transformWhereClause(pstate, stmt->havingClause,
"HAVING");
@@ -1888,7 +1887,7 @@ transformSelectStmt(ParseState *pstate, SelectStmt *stmt)
qry->hasSubLinks = pstate->p_hasSubLinks;
qry->hasAggs = pstate->p_hasAggs;
if (pstate->p_hasAggs || qry->groupClause)
if (pstate->p_hasAggs || qry->groupClause || qry->havingQual)
parseCheckAggregates(pstate, qry);
if (stmt->forUpdate != NIL)
@@ -2104,7 +2103,7 @@ transformSetOperationStmt(ParseState *pstate, SelectStmt *stmt)
qry->hasSubLinks = pstate->p_hasSubLinks;
qry->hasAggs = pstate->p_hasAggs;
if (pstate->p_hasAggs || qry->groupClause)
if (pstate->p_hasAggs || qry->groupClause || qry->havingQual)
parseCheckAggregates(pstate, qry);
if (forUpdate != NIL)
@@ -2751,6 +2750,10 @@ CheckSelectForUpdate(Query *qry)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("SELECT FOR UPDATE is not allowed with GROUP BY clause")));
if (qry->havingQual != NULL)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("SELECT FOR UPDATE is not allowed with HAVING clause")));
if (qry->hasAggs)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),