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First cut at unifying regular selectivity estimation with indexscan

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selectivity estimation wasn't right.  This is better...
This commit is contained in:
Tom Lane
2000-01-23 02:07:00 +00:00
parent 49581f9848
commit 8449df8a67
5 changed files with 136 additions and 72 deletions
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5
src/backend/utils/adt/selfuncs.c
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@ -14,7 +14,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/selfuncs.c,v 1.49 2000/01/22 23:50:20 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/selfuncs.c,v 1.50 2000/01/23 02:06:56 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -725,7 +725,8 @@ genericcostestimate(Query *root, RelOptInfo *rel,
double numIndexPages;
/* Estimate the fraction of main-table tuples that will be visited */
*indexSelectivity = clauselist_selec(root, indexQuals);
*indexSelectivity = clauselist_selectivity(root, indexQuals,
lfirsti(rel->relids));
/* Estimate the number of index tuples that will be visited */
numIndexTuples = *indexSelectivity * index->tuples;