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Further sort-order twiddling in optimizer: be smart about

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case where ORDER BY and GROUP BY request the same sort order.
This commit is contained in:
Tom Lane
1999-08-22 23:56:45 +00:00
parent c9d040d85e
commit e8140adb10
4 changed files with 97 additions and 57 deletions
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13
src/backend/optimizer/plan/createplan.c
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@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/createplan.c,v 1.75 1999/08/22 20:14:47 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/createplan.c,v 1.76 1999/08/22 23:56:44 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -51,7 +51,6 @@ static List *fix_indxqual_sublist(List *indexqual, IndexPath *index_path,
Form_pg_index index);
static Node *fix_indxqual_operand(Node *node, IndexPath *index_path,
Form_pg_index index);
static Noname *make_noname(List *tlist, List *pathkeys, Plan *plan_node);
static IndexScan *make_indexscan(List *qptlist, List *qpqual, Index scanrelid,
List *indxid, List *indxqual, List *indxqualorig);
static NestLoop *make_nestloop(List *qptlist, List *qpqual, Plan *lefttree,
@ -926,12 +925,12 @@ copy_costsize(Plan *dest, Plan *src)
* 'tlist' is the target list of the scan to be sorted or materialized
* 'pathkeys' is the list of pathkeys by which the result is to be sorted
* (NIL implies no sort needed, just materialize it)
* 'plan_node' is the node which yields input tuples
* 'subplan' is the node which yields input tuples
*/
static Noname *
Noname *
make_noname(List *tlist,
List *pathkeys,
Plan *plan_node)
Plan *subplan)
{
List *noname_tlist;
int numsortkeys;
@ -946,7 +945,7 @@ make_noname(List *tlist,
/* need to sort */
retval = (Plan *) make_sort(noname_tlist,
_NONAME_RELATION_ID_,
plan_node,
subplan,
numsortkeys);
}
else
@ -954,7 +953,7 @@ make_noname(List *tlist,
/* no sort */
retval = (Plan *) make_material(noname_tlist,
_NONAME_RELATION_ID_,
plan_node,
subplan,
0);
}