diff --git a/src/backend/utils/cache/plancache.c b/src/backend/utils/cache/plancache.c
index ad8a82f1e3..cc99cf6dcc 100644
--- a/src/backend/utils/cache/plancache.c
+++ b/src/backend/utils/cache/plancache.c
@@ -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	plancache_mode;
 
 /*
  * InitPlanCache: initialize module during InitPostgres.
@@ -1031,6 +1033,12 @@ choose_custom_plan(CachedPlanSource *plansource, ParamListInfo boundParams)
 	if (IsTransactionStmtPlan(plansource))
 		return false;
 
+	/* See if settings wants to force the decision */
+	if (plancache_mode & PLANCACHE_FORCE_GENERIC_PLAN)
+		return false;
+	if (plancache_mode & PLANCACHE_FORCE_CUSTOM_PLAN)
+		return true;
+
 	/* See if caller wants to force the decision */
 	if (plansource->cursor_options & CURSOR_OPT_GENERIC_PLAN)
 		return false;
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index ae22185fbd..4ce275e39d 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -403,6 +403,13 @@ static const struct config_enum_entry force_parallel_mode_options[] = {
 	{NULL, 0, false}
 };
 
+static const struct config_enum_entry plancache_mode_options[] = {
+	{"default", PLANCACHE_DEFAULT, false},
+	{"force_generic_plan", PLANCACHE_FORCE_GENERIC_PLAN, false},
+	{"force_custom_plan", PLANCACHE_FORCE_CUSTOM_PLAN, false},
+	{NULL, 0, false}
+};
+
 /*
  * password_encryption used to be a boolean, so accept all the likely
  * variants of "on", too. "off" used to store passwords in plaintext,
@@ -3916,6 +3923,16 @@ static struct config_enum ConfigureNamesEnum[] =
 		NULL, NULL, NULL
 	},
 
+	{
+		{"plancache_mode", PGC_USERSET, QUERY_TUNING_OTHER,
+			gettext_noop("Forces use of custom or generic plans."),
+			gettext_noop("It can control query plan cache.")
+		},
+		&plancache_mode,
+		PLANCACHE_DEFAULT, plancache_mode_options,
+		NULL, NULL, NULL
+	},
+
 	/* End-of-list marker */
 	{
 		{NULL, 0, 0, NULL, NULL}, NULL, 0, NULL, NULL, NULL, NULL
diff --git a/src/include/utils/plancache.h b/src/include/utils/plancache.h
index 87fab19f3c..962895cc1a 100644
--- a/src/include/utils/plancache.h
+++ b/src/include/utils/plancache.h
@@ -143,7 +143,6 @@ typedef struct CachedPlan
 	MemoryContext context;		/* context containing this CachedPlan */
 } CachedPlan;
 
-
 extern void InitPlanCache(void);
 extern void ResetPlanCache(void);
 
@@ -182,4 +181,16 @@ extern CachedPlan *GetCachedPlan(CachedPlanSource *plansource,
 			  QueryEnvironment *queryEnv);
 extern void ReleaseCachedPlan(CachedPlan *plan, bool useResOwner);
 
+/* possible values for plancache_mode */
+typedef enum
+{
+	PLANCACHE_DEFAULT,
+	PLANCACHE_FORCE_GENERIC_PLAN,
+	PLANCACHE_FORCE_CUSTOM_PLAN
+}			PlanCacheMode;
+
+
+/* GUC parameter */
+extern int plancache_mode;
+
 #endif							/* PLANCACHE_H */