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Diffstat (limited to 'src/backend/optimizer/util/pathnode.c')
-rw-r--r--src/backend/optimizer/util/pathnode.c81
1 files changed, 46 insertions, 35 deletions
diff --git a/src/backend/optimizer/util/pathnode.c b/src/backend/optimizer/util/pathnode.c
index 28ab4573741..47b6f3be2b6 100644
--- a/src/backend/optimizer/util/pathnode.c
+++ b/src/backend/optimizer/util/pathnode.c
@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/optimizer/util/pathnode.c,v 1.25 1999/02/11 05:29:08 momjian Exp $
+ * $Header: /cvsroot/pgsql/src/backend/optimizer/util/pathnode.c,v 1.26 1999/02/11 14:59:02 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@@ -158,7 +158,8 @@ better_path(Path *new_path, List *unique_paths, bool *is_new)
Path *path = (Path *) NULL;
List *temp = NIL;
int longer_key;
-
+ int more_sort;
+
foreach(temp, unique_paths)
{
path = (Path *) lfirst(temp);
@@ -176,18 +177,18 @@ better_path(Path *new_path, List *unique_paths, bool *is_new)
length(lfirst(path->pathkeys)) < length(lfirst(new_path->pathkeys)))
sleep(0); /* set breakpoint here */
}
- if (!equal_path_ordering(new_path->path_order, path->path_order))
+ if (!pathorder_match(new_path->pathorder, path->pathorder, &more_sort))
{
printf("oldord\n");
- pprint(path->path_order);
+ pprint(path->pathorder);
printf("neword\n");
- pprint(new_path->path_order);
+ pprint(new_path->pathorder);
}
#endif
if (pathkeys_match(new_path->pathkeys, path->pathkeys, &longer_key))
{
- if (equal_path_ordering(new_path->path_order, path->path_order))
+ if (pathorder_match(new_path->pathorder, path->pathorder, &more_sort))
{
/*
* Replace pathkeys that match exactly, (1,2), (1,2).
@@ -196,18 +197,28 @@ better_path(Path *new_path, List *unique_paths, bool *is_new)
* path if it is not more expensive.
*/
- /* same keys, and new is cheaper, use it */
- if ((longer_key == 0 && new_path->path_cost < path->path_cost) ||
- /* new is longer, and cheaper, use it */
- (longer_key == 1 && new_path->path_cost <= path->path_cost))
+ /* same keys, and new is cheaper, use it */
+ if ((longer_key == 0 && more_sort == 0 &&
+ new_path->path_cost < path->path_cost) ||
+
+ /* new is better, and cheaper, use it */
+ ((longer_key == 1 && more_sort != 2) ||
+ (longer_key != 2 && more_sort == 1)) &&
+ new_path->path_cost <= path->path_cost)
{
*is_new = false;
return new_path;
}
- /* same keys, new is more expensive, stop */
- else if ((longer_key == 0 && new_path->path_cost >= path->path_cost) ||
- /* old is longer, and less expensive, stop */
- (longer_key == 2 && new_path->path_cost >= path->path_cost))
+
+ /* same keys, new is more expensive, stop */
+ else if
+ ((longer_key == 0 && more_sort == 0 &&
+ new_path->path_cost >= path->path_cost) ||
+
+ /* old is better, and less expensive, stop */
+ ((longer_key == 2 && more_sort != 1) ||
+ (longer_key != 1 && more_sort == 2)) &&
+ new_path->path_cost >= path->path_cost)
{
*is_new = false;
return NULL;
@@ -242,9 +253,9 @@ create_seqscan_path(RelOptInfo *rel)
pathnode->pathtype = T_SeqScan;
pathnode->parent = rel;
pathnode->path_cost = 0.0;
- pathnode->path_order = makeNode(PathOrder);
- pathnode->path_order->ordtype = SORTOP_ORDER;
- pathnode->path_order->ord.sortop = NULL;
+ pathnode->pathorder = makeNode(PathOrder);
+ pathnode->pathorder->ordtype = SORTOP_ORDER;
+ pathnode->pathorder->ord.sortop = NULL;
pathnode->pathkeys = NIL;
/*
@@ -292,9 +303,9 @@ create_index_path(Query *root,
pathnode->path.pathtype = T_IndexScan;
pathnode->path.parent = rel;
- pathnode->path.path_order = makeNode(PathOrder);
- pathnode->path.path_order->ordtype = SORTOP_ORDER;
- pathnode->path.path_order->ord.sortop = index->ordering;
+ pathnode->path.pathorder = makeNode(PathOrder);
+ pathnode->path.pathorder->ordtype = SORTOP_ORDER;
+ pathnode->path.pathorder->ord.sortop = index->ordering;
pathnode->indexid = index->relids;
pathnode->indexkeys = index->indexkeys;
@@ -311,7 +322,7 @@ create_index_path(Query *root,
* The index must have an ordering for the path to have (ordering)
* keys, and vice versa.
*/
- if (pathnode->path.path_order->ord.sortop)
+ if (pathnode->path.pathorder->ord.sortop)
{
pathnode->path.pathkeys = collect_index_pathkeys(index->indexkeys,
rel->targetlist);
@@ -323,7 +334,7 @@ create_index_path(Query *root,
* if no index keys were found, we can't order the path).
*/
if (pathnode->path.pathkeys == NULL)
- pathnode->path.path_order->ord.sortop = NULL;
+ pathnode->path.pathorder->ord.sortop = NULL;
}
else
pathnode->path.pathkeys = NULL;
@@ -449,20 +460,20 @@ create_nestloop_path(RelOptInfo *joinrel,
pathnode->path.joinid = NIL;
pathnode->path.outerjoincost = (Cost) 0.0;
pathnode->path.loc_restrictinfo = NIL;
- pathnode->path.path_order = makeNode(PathOrder);
+ pathnode->path.pathorder = makeNode(PathOrder);
if (pathkeys)
{
- pathnode->path.path_order->ordtype = outer_path->path_order->ordtype;
- if (outer_path->path_order->ordtype == SORTOP_ORDER)
- pathnode->path.path_order->ord.sortop = outer_path->path_order->ord.sortop;
+ pathnode->path.pathorder->ordtype = outer_path->pathorder->ordtype;
+ if (outer_path->pathorder->ordtype == SORTOP_ORDER)
+ pathnode->path.pathorder->ord.sortop = outer_path->pathorder->ord.sortop;
else
- pathnode->path.path_order->ord.merge = outer_path->path_order->ord.merge;
+ pathnode->path.pathorder->ord.merge = outer_path->pathorder->ord.merge;
}
else
{
- pathnode->path.path_order->ordtype = SORTOP_ORDER;
- pathnode->path.path_order->ord.sortop = NULL;
+ pathnode->path.pathorder->ordtype = SORTOP_ORDER;
+ pathnode->path.pathorder->ord.sortop = NULL;
}
pathnode->path.path_cost = cost_nestloop(outer_path->path_cost,
@@ -521,9 +532,9 @@ create_mergejoin_path(RelOptInfo *joinrel,
pathnode->jpath.innerjoinpath = inner_path;
pathnode->jpath.pathinfo = joinrel->restrictinfo;
pathnode->jpath.path.pathkeys = pathkeys;
- pathnode->jpath.path.path_order = makeNode(PathOrder);
- pathnode->jpath.path.path_order->ordtype = MERGE_ORDER;
- pathnode->jpath.path.path_order->ord.merge = order;
+ pathnode->jpath.path.pathorder = makeNode(PathOrder);
+ pathnode->jpath.path.pathorder->ordtype = MERGE_ORDER;
+ pathnode->jpath.path.pathorder->ord.merge = order;
pathnode->path_mergeclauses = mergeclauses;
pathnode->jpath.path.loc_restrictinfo = NIL;
pathnode->outersortkeys = outersortkeys;
@@ -587,9 +598,9 @@ create_hashjoin_path(RelOptInfo *joinrel,
pathnode->jpath.pathinfo = joinrel->restrictinfo;
pathnode->jpath.path.loc_restrictinfo = NIL;
pathnode->jpath.path.pathkeys = pathkeys;
- pathnode->jpath.path.path_order = makeNode(PathOrder);
- pathnode->jpath.path.path_order->ordtype = SORTOP_ORDER;
- pathnode->jpath.path.path_order->ord.sortop = NULL;
+ pathnode->jpath.path.pathorder = makeNode(PathOrder);
+ pathnode->jpath.path.pathorder->ordtype = SORTOP_ORDER;
+ pathnode->jpath.path.pathorder->ord.sortop = NULL;
pathnode->jpath.path.outerjoincost = (Cost) 0.0;
pathnode->jpath.path.joinid = (Relid) NULL;
/* pathnode->hashjoinoperator = operator; */
generated by cgit v1.2.3 (git 2.25.1) at 2025-05-23 03:22:48 +0000