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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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47
src/backend/optimizer/util/clauses.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/util/clauses.c,v 1.158 2003/12/30 23:53:15 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/util/clauses.c,v 1.159 2004/01/04 03:51:52 tgl Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@@ -928,51 +928,6 @@ has_distinct_on_clause(Query *query)
* *
*****************************************************************************/
/*
* clause_get_relids_vars
* Retrieves distinct relids and vars appearing within a clause.
*
* '*relids' is set to the set of all distinct "varno"s appearing
* in Vars within the clause.
* '*vars' is set to a list of all distinct Vars appearing within the clause.
* Var nodes are considered distinct if they have different varno
* or varattno values. If there are several occurrences of the same
* varno/varattno, you get a randomly chosen one...
*
* Note that upper-level vars are ignored, since they normally will
* become Params with respect to this query level.
*/
void
clause_get_relids_vars(Node *clause, Relids *relids, List **vars)
{
List *clvars = pull_var_clause(clause, false);
Relids varnos = NULL;
List *var_list = NIL;
List *i;
foreach(i, clvars)
{
Var *var = (Var *) lfirst(i);
List *vi;
varnos = bms_add_member(varnos, var->varno);
foreach(vi, var_list)
{
Var *in_list = (Var *) lfirst(vi);
if (in_list->varno == var->varno &&
in_list->varattno == var->varattno)
break;
}
if (vi == NIL)
var_list = lcons(var, var_list);
}
freeList(clvars);
*relids = varnos;
*vars = var_list;
}
/*
* NumRelids
* (formerly clause_relids)