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Code Issues Releases Wiki Activity

Fix OR index selectivity problem.

This commit is contained in:
Bruce Momjian 1999-03-08 14:01:57 +00:00
parent c831d08fac
commit f7430af934
2 changed files with 19 additions and 27 deletions
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43
src/backend/optimizer/path/orindxpath.c
View File

@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/orindxpath.c,v 1.22 1999/03/08 13:35:50 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/orindxpath.c,v 1.23 1999/03/08 14:01:55 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -33,8 +33,7 @@
static void
best_or_subclause_indices(Query *root, RelOptInfo *rel, List *subclauses,
List *indices, List *examined_indexids, Cost subcost, List *selectivities,
List **indexids, Cost *cost, List **selecs);
List *indices, List **indexids, Cost *cost, Cost *selec);
static void best_or_subclause_index(Query *root, RelOptInfo *rel, Expr *subclause,
List *indices, int *indexid, Cost *cost, Cost *selec);
@ -87,20 +86,17 @@ create_or_index_paths(Query *root,
if (index_flag)
{ /* used to be a lisp every function */
IndexPath *pathnode = makeNode(IndexPath);
List *indexids;
List *indexids = NIL;
Cost cost;
List *selecs;
Cost selec;
best_or_subclause_indices(root,
rel,
clausenode->clause->args,
clausenode->indexids,
NIL,
(Cost) 0,
NIL,
&indexids,
&cost,
&selecs);
&selec);
pathnode->path.pathtype = T_IndexScan;
pathnode->path.parent = rel;
@ -132,7 +128,7 @@ create_or_index_paths(Query *root,
((Path *) pathnode)->path_cost += xfunc_get_path_cost((Path) pathnode);
}
#endif
clausenode->selectivity = (Cost) floatVal(lfirst(selecs));
clausenode->selectivity = (Cost) selec;
t_list = lappend(t_list, pathnode);
}
}
@ -154,8 +150,7 @@ create_or_index_paths(Query *root,
* 'examined_indexids' is a list of those index ids to be used with
* subclauses that have already been examined
* 'subcost' is the cost of using the indices in 'examined_indexids'
* 'selectivities' is a list of the selectivities of subclauses that
* have already been examined
* 'selec' is a list of all subclauses that have already been examined
*
* Returns a list of the indexids, cost, and selectivities of each
* subclause, e.g., ((i1 i2 i3) cost (s1 s2 s3)), where 'i' is an OID,
@ -166,15 +161,15 @@ best_or_subclause_indices(Query *root,
RelOptInfo *rel,
List *subclauses,
List *indices,
List *examined_indexids,
Cost subcost,
List *selectivities,
List **indexids, /* return value */
Cost *cost, /* return value */
List **selecs) /* return value */
Cost *cost, /* return value */
Cost *selec) /* return value */
{
List *slist;
List *slist;
*selec = (Cost) 0.0;
*cost = (Cost) 0.0;
foreach(slist, subclauses)
{
int best_indexid;
@ -184,17 +179,15 @@ best_or_subclause_indices(Query *root,
best_or_subclause_index(root, rel, lfirst(slist), lfirst(indices),
&best_indexid, &best_cost, &best_selec);
examined_indexids = lappendi(examined_indexids, best_indexid);
subcost += best_cost;
selectivities = lappend(selectivities, makeFloat(best_selec));
*indexids = lappendi(*indexids, best_indexid);
*cost += best_cost;
*selec += best_selec;
if (*selec > (Cost) 1.0)
*selec = (Cost) 1.0;
indices = lnext(indices);
}
*indexids = examined_indexids;
*cost = subcost;
*selecs = selectivities;
return;
}

3
src/backend/optimizer/util/plancat.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/plancat.c,v 1.26 1999/02/21 03:48:54 scrappy Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/plancat.c,v 1.27 1999/03/08 14:01:57 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -545,7 +545,6 @@ IndexSelectivity(Oid indexrelid,
select = 1.0;
for (n = 0; n < nIndexKeys; ++n)
{
/*
* Find the AM class for this key.
*