diff --git a/src/backend/optimizer/path/costsize.c b/src/backend/optimizer/path/costsize.c
index ef475d95a18..31771dfba46 100644
--- a/src/backend/optimizer/path/costsize.c
+++ b/src/backend/optimizer/path/costsize.c
@@ -153,6 +153,7 @@ bool		enable_parallel_hash = true;
 bool		enable_partition_pruning = true;
 bool		enable_presorted_aggregate = true;
 bool		enable_async_append = true;
+bool 		enable_cost_size = true;
 
 typedef struct
 {
@@ -4033,11 +4034,22 @@ final_cost_hashjoin(PlannerInfo *root, HashPath *path,
 				thismcvfreq = restrictinfo->left_mcvfreq;
 			}
 
+			if (enable_cost_size)
+			{
+				innerbucketsize *= thisbucketsize;
+				innermcvfreq *= thismcvfreq;
+			}
+			else
+			{
 			if (innerbucketsize > thisbucketsize)
 				innerbucketsize = thisbucketsize;
 			if (innermcvfreq > thismcvfreq)
 				innermcvfreq = thismcvfreq;
+			}
 		}
+
+		if (enable_cost_size && innerbucketsize > virtualbuckets)
+			innerbucketsize = 1.0 / virtualbuckets;
 	}
 
 	/*
diff --git a/src/backend/utils/misc/guc_tables.c b/src/backend/utils/misc/guc_tables.c
index 71e27f8eb05..ded9ba3b7a9 100644
--- a/src/backend/utils/misc/guc_tables.c
+++ b/src/backend/utils/misc/guc_tables.c
@@ -1007,6 +1007,19 @@ struct config_bool ConfigureNamesBool[] =
 		true,
 		NULL, NULL, NULL
 	},
+	{
+		{"enable_cost_size", PGC_USERSET, QUERY_TUNING_OTHER,
+			gettext_noop("set the optimizer coefficient"
+						 "so that custom or generic plan is selected more often. "
+						 "by default, the value is set to 1, which means that "
+						 "the choice of using both depends on the calculated cost"),
+			NULL,
+			GUC_EXPLAIN
+		},
+		&enable_cost_size,
+		true,
+		NULL, NULL, NULL
+	},
 	{
 		{"enable_async_append", PGC_USERSET, QUERY_TUNING_METHOD,
 			gettext_noop("Enables the planner's use of async append plans."),
diff --git a/src/include/optimizer/cost.h b/src/include/optimizer/cost.h
index 6cf49705d3a..c79ec12e6d5 100644
--- a/src/include/optimizer/cost.h
+++ b/src/include/optimizer/cost.h
@@ -71,6 +71,7 @@ extern PGDLLIMPORT bool enable_partition_pruning;
 extern PGDLLIMPORT bool enable_presorted_aggregate;
 extern PGDLLIMPORT bool enable_async_append;
 extern PGDLLIMPORT int constraint_exclusion;
+extern PGDLLIMPORT bool enable_cost_size;
 
 extern double index_pages_fetched(double tuples_fetched, BlockNumber pages,
 								  double index_pages, PlannerInfo *root);