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Merge restrictlist_selectivity into clauselist_selectivity by

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teaching the latter to accept either RestrictInfo nodes or bare
clause expressions; and cache the selectivity result in the RestrictInfo
node when possible.  This extends the caching behavior of approx_selectivity
to many more contexts, and should reduce duplicate selectivity
calculations.
This commit is contained in:
Tom Lane
2004-01-04 03:51:52 +00:00
parent 21a1202281
commit 82b4dd394f
12 changed files with 196 additions and 200 deletions
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10
src/backend/optimizer/plan/initsplan.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/plan/initsplan.c,v 1.95 2004/01/04 00:07:32 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/plan/initsplan.c,v 1.96 2004/01/04 03:51:52 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -375,15 +375,15 @@ distribute_qual_to_rels(Query *root, Node *clause,
Relids qualscope)
{
Relids relids;
List *vars;
bool can_be_equijoin;
RestrictInfo *restrictinfo;
RelOptInfo *rel;
List *vars;
/*
* Retrieve all relids and vars contained within the clause.
* Retrieve all relids mentioned within the clause.
*/
clause_get_relids_vars(clause, &relids, &vars);
relids = pull_varnos(clause);
/*
* Cross-check: clause should contain no relids not within its scope.
@@ -571,7 +571,9 @@ distribute_qual_to_rels(Query *root, Node *clause,
* that scan those relations (else they won't be available at
* the join node!).
*/
vars = pull_var_clause(clause, false);
add_vars_to_targetlist(root, vars, relids);
freeList(vars);
break;
default: