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Make GEQO use dependent on table and index count.

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This commit is contained in:
Bruce Momjian
1999-02-02 20:30:18 +00:00
parent eb3415538e
commit f1b7823471
4 changed files with 37 additions and 15 deletions
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25
src/backend/optimizer/path/allpaths.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/allpaths.c,v 1.23 1998/09/01 04:29:27 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/allpaths.c,v 1.24 1999/02/02 20:30:05 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -78,7 +78,6 @@ find_paths(Query *root, List *rels)
if (levels_needed <= 1)
{
/*
* Unsorted single relation, no more processing is required.
*/
@ -86,7 +85,6 @@ find_paths(Query *root, List *rels)
}
else
{
/*
* this means that joins or sorts are required. set selectivities
* of clauses that have not been set by an index.
@ -123,7 +121,7 @@ find_rel_paths(Query *root, List *rels)
rel_index_scan_list = find_index_paths(root,
rel,
find_relation_indices(root, rel),
find_relation_indices(root, rel),
rel->clauseinfo,
rel->joininfo);
@ -182,18 +180,27 @@ find_join_paths(Query *root, List *outer_rels, int levels_needed)
* genetic query optimizer entry point *
* <utesch@aut.tu-freiberg.de> *
*******************************************/
{
List *temp;
int paths_to_consider = 0;
if ((_use_geqo_) && length(root->base_rel_list) >= _use_geqo_rels_)
return lcons(geqo(root), NIL); /* returns *one* RelOptInfo, so
* lcons it */
foreach(temp, outer_rels)
{
RelOptInfo *rel = (RelOptInfo *) lfirst(temp);
paths_to_consider += length(rel->pathlist);
}
if ((_use_geqo_) && paths_to_consider >= _use_geqo_rels_)
/* returns _one_ RelOptInfo, so lcons it */
return lcons(geqo(root), NIL);
}
/*******************************************
* rest will be deprecated in case of GEQO *
*******************************************/
while (--levels_needed)
{
/*
* Determine all possible pairs of relations to be joined at this
* level. Determine paths for joining these relation pairs and
@ -207,7 +214,6 @@ find_join_paths(Query *root, List *outer_rels, int levels_needed)
prune_joinrels(new_rels);
#if 0
/*
* * for each expensive predicate in each path in each distinct
* rel, * consider doing pullup -- JMH
@ -247,7 +253,6 @@ find_join_paths(Query *root, List *outer_rels, int levels_needed)
if (BushyPlanFlag)
{
/*
* prune rels that have been completely incorporated into new
* join rels