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optimizer update

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This commit is contained in:
Bruce Momjian
1999-02-12 02:37:52 +00:00
parent 847da1a1ee
commit 55d0465009
1 changed files with 11 additions and 5 deletions
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16
src/backend/optimizer/util/pathnode.c
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@ -7,7 +7,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/pathnode.c,v 1.31 1999/02/11 21:05:28 momjian Exp $ * $Header: /cvsroot/pgsql/src/backend/optimizer/util/pathnode.c,v 1.32 1999/02/12 02:37:52 momjian Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -211,19 +211,25 @@ better_path(Path *new_path, List *unique_paths, bool *is_new)
new_path->path_cost <= path->path_cost)) new_path->path_cost <= path->path_cost))
{ {
*is_new = false; *is_new = false;
return new_path; return path;
} }
/* same keys, new is more expensive, stop */ /* same keys, new is more expensive, stop */
else if if ((better_key == 0 && better_sort == 0 &&
((better_key == 0 && better_sort == 0 && new_path->path_cost >= path->path_cost) ||
new_path->path_cost >= path->path_cost) ||
/* old is better, and less expensive, stop */ /* old is better, and less expensive, stop */
(((better_key == 2 && better_sort != 1) || (((better_key == 2 && better_sort != 1) ||
(better_key != 1 && better_sort == 2)) && (better_key != 1 && better_sort == 2)) &&
new_path->path_cost >= path->path_cost)) new_path->path_cost >= path->path_cost))
{ {
#ifdef OPTDB_DEBUG
printf("better key %d better sort %d\n", better_key, better_sort);
printf("new\n");
pprint(new_path);
printf("old\n");
pprint(path);
#endif
*is_new = false; *is_new = false;
return NULL; return NULL;
} }