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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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14
src/backend/optimizer/plan/createplan.c
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@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/createplan.c,v 1.79 2000/01/15 02:59:30 petere Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/createplan.c,v 1.80 2000/01/23 02:07:00 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -305,6 +305,7 @@ create_indexscan_node(Query *root,
List *scan_clauses)
{
List *indxqual = best_path->indexqual;
Index baserelid;
List *qpqual;
List *fixed_indxqual;
List *ixid;
@ -314,6 +315,7 @@ create_indexscan_node(Query *root,
/* there should be exactly one base rel involved... */
Assert(length(best_path->path.parent->relids) == 1);
baserelid = lfirsti(best_path->path.parent->relids);
/* check to see if any of the indices are lossy */
foreach(ixid, best_path->indexid)
@ -382,7 +384,9 @@ create_indexscan_node(Query *root,
{
/* recompute output row estimate using all available quals */
plan_rows = best_path->path.parent->tuples *
clauselist_selec(root, lcons(indxqual_expr, qpqual));
clauselist_selectivity(root,
lcons(indxqual_expr, qpqual),
baserelid);
}
if (lossy)
@ -401,7 +405,9 @@ create_indexscan_node(Query *root,
{
/* recompute output row estimate using all available quals */
plan_rows = best_path->path.parent->tuples *
clauselist_selec(root, nconc(listCopy(indxqual_list), qpqual));
clauselist_selectivity(root,
nconc(listCopy(indxqual_list), qpqual),
baserelid);
}
if (lossy)
@ -417,7 +423,7 @@ create_indexscan_node(Query *root,
scan_node = make_indexscan(tlist,
qpqual,
lfirsti(best_path->path.parent->relids),
baserelid,
best_path->indexid,
fixed_indxqual,
indxqual);