Do not use RemoteSubplan for simple Result plan which can be evaluated on any

node

This should reduce connections for a single INSERT statements

diff --git a/src/backend/optimizer/plan/planner.c b/src/backend/optimizer/plan/planner.c
index 06cd9703c723dcbd48cd38c783583b5f0b46660e..40201918a277bad5eaf649ab214ee773fa15ebc2 100644 (file)
--- a/src/backend/optimizer/plan/planner.c
+++ b/src/backend/optimizer/plan/planner.c
@@ -2713,7 +2713,9 @@ grouping_planner(PlannerInfo *root, double tuple_fraction)
                                                        distributePlan->distributionNodes, nodenum);
                                bms_free(tmpset);
                        }
-                       else
+                       else if (!(IsA(result_plan, Result) && result_plan->lefttree ==
+                                               NULL &&
+                                               bms_num_members(root->distribution->restrictNodes) == 1))
                                result_plan = (Plan *) make_remotesubplan(root,
                                                                                                                  result_plan,
                                                                                                                  root->distribution,