Fix a bug where queries would incorrectly get executed on the coordinator.

Report by Krzysztof Nienartowicz, patch by me.

diff --git a/src/backend/optimizer/plan/createplan.c b/src/backend/optimizer/plan/createplan.c
index f8b325032345134170c026438af08f7c78b3a49f..7797040183cb8b143d2bcb3680303c65ceebda18 100644 (file)
--- a/src/backend/optimizer/plan/createplan.c
+++ b/src/backend/optimizer/plan/createplan.c
@@ -1277,13 +1277,13 @@ create_remotescan_plan(PlannerInfo *root,
 
 
 static RemoteSubplan *
-find_push_down_plan_int(PlannerInfo *root, Plan *plan, bool force, Plan **parent)
+find_push_down_plan_int(PlannerInfo *root, Plan *plan, bool force, bool delete, Plan **parent)
 {
        if (IsA(plan, RemoteSubplan) &&
                        (force || (list_length(((RemoteSubplan *) plan)->nodeList) > 1 &&
                                           ((RemoteSubplan *) plan)->execOnAll)))
        {
-               if (parent)
+               if (delete && (parent))
                        *parent = plan->lefttree;
                return (RemoteSubplan *) plan;
        }
@@ -1292,7 +1292,7 @@ find_push_down_plan_int(PlannerInfo *root, Plan *plan, bool force, Plan **parent
                        IsA(plan, Material) ||
                        IsA(plan, Unique) ||
                        IsA(plan, Limit))
-               return find_push_down_plan_int(root, plan->lefttree, force, &plan->lefttree);
+               return find_push_down_plan_int(root, plan->lefttree, force, delete, &plan->lefttree);
 
        /*
         * If its a subquery scan and we are looking to replace RemoteSubplan then
@@ -1301,7 +1301,8 @@ find_push_down_plan_int(PlannerInfo *root, Plan *plan, bool force, Plan **parent
        if (parent && IsA(plan, SubqueryScan))
        {
                Plan *subplan = ((SubqueryScan *)plan)->subplan;
-               RemoteSubplan *remote_plan = find_push_down_plan_int(root, ((SubqueryScan *)plan)->subplan, force,
+               RemoteSubplan *remote_plan = find_push_down_plan_int(root,
+                               ((SubqueryScan *)plan)->subplan, force, delete,
                                &((SubqueryScan *)plan)->subplan);
 
                /*
@@ -1323,7 +1324,7 @@ find_push_down_plan_int(PlannerInfo *root, Plan *plan, bool force, Plan **parent
 RemoteSubplan *
 find_push_down_plan(Plan *plan, bool force)
 {
-       return find_push_down_plan_int(NULL, plan, force, NULL);
+       return find_push_down_plan_int(NULL, plan, force, false, NULL);
 }
 
 RemoteSubplan *
@@ -1332,7 +1333,7 @@ find_delete_push_down_plan(PlannerInfo *root,
                bool force,
                Plan **parent)
 {
-       return find_push_down_plan_int(root, plan, force, parent);
+       return find_push_down_plan_int(root, plan, force, true, parent);
 }
 #endif