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Cause planner to include costs of InitPlans in startup cost of parent 

plan node.  Not sure why this oversight has persisted so long ...
This commit is contained in:
Tom Lane 2002-12-19 23:25:01 +00:00
parent abf6f48319
commit 6d6c9fd9a4
1 changed files with 20 additions and 7 deletions
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27
src/backend/optimizer/plan/planner.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/planner.c,v 1.135 2002/12/14 00:17:55 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/planner.c,v 1.136 2002/12/19 23:25:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -264,25 +264,38 @@ subquery_planner(Query *parse, double tuple_fraction)
/*
* If any subplans were generated, or if we're inside a subplan, build
* subPlan, extParam and locParam lists for plan nodes.
* initPlan, extParam and locParam lists for plan nodes.
*/
if (PlannerPlanId != saved_planid || PlannerQueryLevel > 1)
{
Cost initplan_cost = 0;
/* Prepare extParam/locParam data for all nodes in tree */
(void) SS_finalize_plan(plan, parse->rtable);
/*
* At the moment, SS_finalize_plan doesn't handle initPlans and so
* we assign them to the topmost plan node.
* SS_finalize_plan doesn't handle initPlans, so we have to manually
* attach them to the topmost plan node, and add their extParams to
* the topmost node's, too.
*
* We also add the total_cost of each initPlan to the startup cost
* of the top node. This is a conservative overestimate, since in
* fact each initPlan might be executed later than plan startup, or
* even not at all.
*/
plan->initPlan = PlannerInitPlan;
/* Must add the initPlans' extParams to the topmost node's, too */
foreach(lst, plan->initPlan)
{
SubPlan *subplan = (SubPlan *) lfirst(lst);
SubPlan *initplan = (SubPlan *) lfirst(lst);
plan->extParam = set_unioni(plan->extParam,
subplan->plan->extParam);
initplan->plan->extParam);
initplan_cost += initplan->plan->total_cost;
}
plan->startup_cost += initplan_cost;
plan->total_cost += initplan_cost;
}
/* Return to outer subquery context */