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Repair incorrect checking of grouped/ungrouped variables in the presence

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of unnamed joins; per pghackers discussion 31-Mar-03.
This commit is contained in:
Tom Lane 2003-04-03 18:04:09 +00:00
parent cdbd298b3a
commit 906dce0464
1 changed files with 38 additions and 9 deletions
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47
src/backend/parser/parse_agg.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/parse_agg.c,v 1.51 2003/01/17 03:25:04 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/parse_agg.c,v 1.52 2003/04/03 18:04:09 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -16,6 +16,7 @@
#include "optimizer/clauses.h"
#include "optimizer/tlist.h"
#include "optimizer/var.h"
#include "parser/parse_agg.h"
#include "parser/parsetree.h"
@ -179,7 +180,9 @@ parseCheckAggregates(ParseState *pstate, Query *qry)
{
List *groupClauses = NIL;
bool have_non_var_grouping = false;
List *tl;
List *lst;
bool hasJoinRTEs;
Node *clause;
/* This should only be called if we found aggregates, GROUP, or HAVING */
Assert(pstate->p_hasAggs || qry->groupClause || qry->havingQual);
@ -205,9 +208,9 @@ parseCheckAggregates(ParseState *pstate, Query *qry)
* repeated scans of the targetlist within the recursive routine...).
* And detect whether any of the expressions aren't simple Vars.
*/
foreach(tl, qry->groupClause)
foreach(lst, qry->groupClause)
{
GroupClause *grpcl = lfirst(tl);
GroupClause *grpcl = (GroupClause *) lfirst(lst);
Node *expr;
expr = get_sortgroupclause_expr(grpcl, qry->targetList);
@ -220,14 +223,40 @@ parseCheckAggregates(ParseState *pstate, Query *qry)
have_non_var_grouping = true;
}
/*
* If there are join alias vars involved, we have to flatten them
* to the underlying vars, so that aliased and unaliased vars will be
* correctly taken as equal. We can skip the expense of doing this
* if no rangetable entries are RTE_JOIN kind.
*/
hasJoinRTEs = false;
foreach(lst, pstate->p_rtable)
{
RangeTblEntry *rte = (RangeTblEntry *) lfirst(lst);
if (rte->rtekind == RTE_JOIN)
{
hasJoinRTEs = true;
break;
}
}
if (hasJoinRTEs)
groupClauses = (List *) flatten_join_alias_vars(qry,
(Node *) groupClauses);
/*
* Check the targetlist and HAVING clause for ungrouped variables.
*/
check_ungrouped_columns((Node *) qry->targetList, pstate,
groupClauses, have_non_var_grouping);
check_ungrouped_columns((Node *) qry->havingQual, pstate,
clause = (Node *) qry->targetList;
if (hasJoinRTEs)
clause = flatten_join_alias_vars(qry, clause);
check_ungrouped_columns(clause, pstate,
groupClauses, have_non_var_grouping);
/* Release the list storage (but not the pointed-to expressions!) */
freeList(groupClauses);
clause = (Node *) qry->havingQual;
if (hasJoinRTEs)
clause = flatten_join_alias_vars(qry, clause);
check_ungrouped_columns(clause, pstate,
groupClauses, have_non_var_grouping);
}