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Add plan_cache_mode setting

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This allows overriding the choice of custom or generic plan.

Author: Pavel Stehule <pavel.stehule@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/CAFj8pRAGLaiEm8ur5DWEBo7qHRWTk9HxkuUAz00CZZtJj-LkCA%40mail.gmail.com
This commit is contained in:
Peter Eisentraut
2018-07-16 13:35:41 +02:00
parent a06e56b247
commit f7cb2842bf
7 changed files with 179 additions and 0 deletions
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8
src/backend/utils/cache/plancache.c vendored
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@ -106,6 +106,8 @@ static void PlanCacheRelCallback(Datum arg, Oid relid);
static void PlanCacheFuncCallback(Datum arg, int cacheid, uint32 hashvalue);
static void PlanCacheSysCallback(Datum arg, int cacheid, uint32 hashvalue);
/* GUC parameter */
int plan_cache_mode;
/*
* InitPlanCache: initialize module during InitPostgres.
@ -1033,6 +1035,12 @@ choose_custom_plan(CachedPlanSource *plansource, ParamListInfo boundParams)
if (IsTransactionStmtPlan(plansource))
return false;
/* Let settings force the decision */
if (plan_cache_mode == PLAN_CACHE_MODE_FORCE_GENERIC_PLAN)
return false;
if (plan_cache_mode == PLAN_CACHE_MODE_FORCE_CUSTOM_PLAN)
return true;
/* See if caller wants to force the decision */
if (plansource->cursor_options & CURSOR_OPT_GENERIC_PLAN)
return false;