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Add COST and ROWS options to CREATE/ALTER FUNCTION, plus underlying pg_proc

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columns procost and prorows, to allow simple user adjustment of the estimated
cost of a function call, as well as control of the estimated number of rows
returned by a set-returning function.  We might eventually wish to extend this
to allow function-specific estimation routines, but there seems to be
consensus that we should try a simple constant estimate first.  In particular
this provides a relatively simple way to control the order in which different
WHERE clauses are applied in a plan node, which is a Good Thing in view of the
fact that the recent EquivalenceClass planner rewrite made that much less
predictable than before.
This commit is contained in:
Tom Lane
2007-01-22 01:35:23 +00:00
parent a85e9c61e5
commit 5a7471c307
27 changed files with 2550 additions and 2090 deletions
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3
src/include/optimizer/clauses.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/optimizer/clauses.h,v 1.85 2007/01/05 22:19:56 momjian Exp $
* $PostgreSQL: pgsql/src/include/optimizer/clauses.h,v 1.86 2007/01/22 01:35:22 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -51,6 +51,7 @@ extern bool contain_agg_clause(Node *clause);
extern void count_agg_clauses(Node *clause, AggClauseCounts *counts);
extern bool expression_returns_set(Node *clause);
extern double expression_returns_set_rows(Node *clause);
extern bool contain_subplans(Node *clause);

3
src/include/optimizer/cost.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/optimizer/cost.h,v 1.83 2007/01/05 22:19:56 momjian Exp $
* $PostgreSQL: pgsql/src/include/optimizer/cost.h,v 1.84 2007/01/22 01:35:22 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -89,6 +89,7 @@ extern void cost_nestloop(NestPath *path, PlannerInfo *root);
extern void cost_mergejoin(MergePath *path, PlannerInfo *root);
extern void cost_hashjoin(HashPath *path, PlannerInfo *root);
extern void cost_qual_eval(QualCost *cost, List *quals);
extern void cost_qual_eval_node(QualCost *cost, Node *qual);
extern void set_baserel_size_estimates(PlannerInfo *root, RelOptInfo *rel);
extern void set_joinrel_size_estimates(PlannerInfo *root, RelOptInfo *rel,
RelOptInfo *outer_rel,

3
src/include/optimizer/planmain.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/optimizer/planmain.h,v 1.98 2007/01/20 20:45:40 tgl Exp $
* $PostgreSQL: pgsql/src/include/optimizer/planmain.h,v 1.99 2007/01/22 01:35:22 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -97,5 +97,6 @@ extern List *set_returning_clause_references(List *rlist,
Index resultRelation);
extern void fix_opfuncids(Node *node);
extern void set_opfuncid(OpExpr *opexpr);
extern void set_sa_opfuncid(ScalarArrayOpExpr *opexpr);
#endif /* PLANMAIN_H */