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Merge rename name page into alter table. Fix UNION with DISTINCT

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or ORDER BY bug.
This commit is contained in:
Bruce Momjian
1998-03-31 04:44:35 +00:00
parent 62943bb76f
commit d7050cb68c
5 changed files with 134 additions and 89 deletions
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37
src/backend/optimizer/prep/prepunion.c
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@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/prep/prepunion.c,v 1.21 1998/03/30 19:04:41 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/prep/prepunion.c,v 1.22 1998/03/31 04:43:49 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@@ -64,12 +64,13 @@ plan_union_queries(Query *parse)
{
List *union_plans = NIL,
*ulist,
*unionall_queries,
*union_all_queries,
*union_rts,
*last_union = NIL;
*last_union = NIL,
*hold_sortClause = parse->sortClause;
bool union_all_found = false,
union_found = false,
last_unionall_flag = false;
last_union_all_flag = false;
/*------------------------------------------------------------------
*
@@ -120,17 +121,25 @@ plan_union_queries(Query *parse)
union_found = true;
last_union = ulist;
}
last_unionall_flag = union_query->unionall;
last_union_all_flag = union_query->unionall;
}
/* Is this a simple one */
if (!union_all_found ||
!union_found ||
/* A trailing UNION negates the affect of earlier UNION ALLs */
!last_unionall_flag)
!last_union_all_flag)
{
List *hold_unionClause = parse->unionClause;
/* we will do this later, so don't do it now */
if (!union_all_found ||
!last_union_all_flag)
{
parse->sortClause = NIL;
parse->uniqueFlag = NULL;
}
parse->unionClause = NIL; /* prevent recursion */
union_plans = lcons(union_planner(parse), NIL);
union_rts = lcons(parse->rtable, NIL);
@@ -154,7 +163,7 @@ plan_union_queries(Query *parse)
*/
/* save off everthing past the last UNION */
unionall_queries = lnext(last_union);
union_all_queries = lnext(last_union);
/* clip off the list to remove the trailing UNION ALLs */
lnext(last_union) = NIL;
@@ -167,21 +176,21 @@ plan_union_queries(Query *parse)
union_rts = lcons(parse->rtable, NIL);
/* Append the remainging UNION ALLs */
foreach(ulist, unionall_queries)
foreach(ulist, union_all_queries)
{
Query *unionall_query = lfirst(ulist);
Query *union_all_query = lfirst(ulist);
union_plans = lappend(union_plans, union_planner(unionall_query));
union_rts = lappend(union_rts, unionall_query->rtable);
union_plans = lappend(union_plans, union_planner(union_all_query));
union_rts = lappend(union_rts, union_all_query->rtable);
}
}
/* We have already split UNION and UNION ALL and we made it consistent */
if (!last_unionall_flag)
if (!last_union_all_flag)
{
parse->uniqueFlag = "*";
parse->sortClause = transformSortClause(NULL, NIL,
parse->sortClause,
hold_sortClause,
parse->targetList, "*");
}
else
@@ -195,7 +204,7 @@ plan_union_queries(Query *parse)
union_rts,
0,
NULL,
((Plan *) lfirst(union_plans))->targetlist));
parse->targetList));
}