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Make planner safe for recursive calls --- needed for cases where

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eval_const_expressions tries to simplify an SQL function.
This commit is contained in:
Tom Lane
2000-07-27 23:16:04 +00:00
parent faa4171728
commit ff7da2f498
3 changed files with 32 additions and 54 deletions
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24
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 1.85 2000/06/20 04:22:21 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/planner.c,v 1.86 2000/07/27 23:15:57 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -50,6 +50,22 @@ Plan *
planner(Query *parse)
{
Plan *result_plan;
Index save_PlannerQueryLevel;
List *save_PlannerInitPlan;
List *save_PlannerParamVar;
int save_PlannerPlanId;
/*
* The planner can be called recursively (an example is when
* eval_const_expressions tries to simplify an SQL function).
* So, global state variables must be saved and restored.
*
* (Perhaps these should be moved into the Query structure instead?)
*/
save_PlannerQueryLevel = PlannerQueryLevel;
save_PlannerInitPlan = PlannerInitPlan;
save_PlannerParamVar = PlannerParamVar;
save_PlannerPlanId = PlannerPlanId;
/* Initialize state for subselects */
PlannerQueryLevel = 1;
@ -78,6 +94,12 @@ planner(Query *parse)
/* final cleanup of the plan */
set_plan_references(result_plan);
/* restore state for outer planner, if any */
PlannerQueryLevel = save_PlannerQueryLevel;
PlannerInitPlan = save_PlannerInitPlan;
PlannerParamVar = save_PlannerParamVar;
PlannerPlanId = save_PlannerPlanId;
return result_plan;
}