mirrors/postgres
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

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

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
src/backend/optimizer/plan/planner.c
View File

@ -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 */