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Optimizer cleanups.

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This commit is contained in:
Bruce Momjian
1999-02-11 21:05:28 +00:00
parent c873fcdaf4
commit 34ecb9d850
2 changed files with 47 additions and 43 deletions
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79
src/backend/optimizer/util/pathnode.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/pathnode.c,v 1.30 1999/02/11 17:21:51 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/pathnode.c,v 1.31 1999/02/11 21:05:28 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -29,7 +29,7 @@
#include "parser/parsetree.h" /* for getrelid() */
static Path *better_path(Path *new_path, List *unique_paths, bool *isNew);
static Path *better_path(Path *new_path, List *unique_paths, bool *is_new);
/*****************************************************************************
@ -173,11 +173,14 @@ better_path(Path *new_path, List *unique_paths, bool *is_new)
printf("newpath\n");
pprint(new_path->pathkeys);
if (path->pathkeys && new_path->pathkeys &&
length(lfirst(path->pathkeys)) >= 2 &&
length(lfirst(path->pathkeys)) < length(lfirst(new_path->pathkeys)))
length(lfirst(path->pathkeys)) >= 2/* &&
length(lfirst(path->pathkeys)) <
length(lfirst(new_path->pathkeys))*/)
sleep(0); /* set breakpoint here */
}
if (!pathorder_match(new_path->pathorder, path->pathorder, &better_sort))
if (!pathorder_match(new_path->pathorder, path->pathorder,
&better_sort) ||
better_sort != 0)
{
printf("oldord\n");
pprint(path->pathorder);
@ -186,43 +189,43 @@ better_path(Path *new_path, List *unique_paths, bool *is_new)
}
#endif
if (pathkeys_match(new_path->pathkeys, path->pathkeys, &better_key))
if (pathkeys_match(new_path->pathkeys, path->pathkeys,
&better_key) &&
pathorder_match(new_path->pathorder, path->pathorder,
&better_sort))
{
if (pathorder_match(new_path->pathorder, path->pathorder, &better_sort))
/*
* Replace pathkeys that match exactly, (1,2), (1,2).
* Replace pathkeys (1,2) with (1,2,3) if the latter is not
* more expensive and replace unordered path with ordered
* path if it is not more expensive. Favor sorted keys
* over unsorted keys in the same way.
*/
/* same keys, and new is cheaper, use it */
if ((better_key == 0 && better_sort == 0 &&
new_path->path_cost < path->path_cost) ||
/* new is better, and cheaper, use it */
(((better_key == 1 && better_sort != 2) ||
(better_key != 2 && better_sort == 1)) &&
new_path->path_cost <= path->path_cost))
{
/*
* Replace pathkeys that match exactly, (1,2), (1,2).
* Replace pathkeys (1,2) with (1,2,3) if the latter is not
* more expensive and replace unordered path with ordered
* path if it is not more expensive. Favor sorted keys
* over unsorted keys in the same way.
*/
/* same keys, and new is cheaper, use it */
if ((better_key == 0 && better_sort == 0 &&
new_path->path_cost < path->path_cost) ||
*is_new = false;
return new_path;
}
/* new is better, and cheaper, use it */
(((better_key == 1 && better_sort != 2) ||
(better_key != 2 && better_sort == 1)) &&
new_path->path_cost <= path->path_cost))
{
*is_new = false;
return new_path;
}
/* same keys, new is more expensive, stop */
else if
((better_key == 0 && better_sort == 0 &&
new_path->path_cost >= path->path_cost) ||
/* same keys, new is more expensive, stop */
else if
((better_key == 0 && better_sort == 0 &&
new_path->path_cost >= path->path_cost) ||
/* old is better, and less expensive, stop */
(((better_key == 2 && better_sort != 1) ||
(better_key != 1 && better_sort == 2)) &&
new_path->path_cost >= path->path_cost))
{
*is_new = false;
return NULL;
}
/* old is better, and less expensive, stop */
(((better_key == 2 && better_sort != 1) ||
(better_key != 1 && better_sort == 2)) &&
new_path->path_cost >= path->path_cost))
{
*is_new = false;
return NULL;
}
}
}