comment about a place adding unnecessary top-level RemoteSubpans

diff --git a/src/backend/optimizer/plan/planner.c b/src/backend/optimizer/plan/planner.c
index 1bb2bcb1ce49728953a50ed194d48b07874220be..4cab3aea93aecbd91cc3adf66f55b4c601d891b2 100644 (file)
--- a/src/backend/optimizer/plan/planner.c
+++ b/src/backend/optimizer/plan/planner.c
@@ -330,6 +330,11 @@ standard_planner(Query *parse, int cursorOptions, ParamListInfo boundParams)
 #ifdef XCP
        if (root->distribution)
        {
+               /*
+                * FIXME, this keeps adding RemoteSubplan at a top of queries that
+                * don't really need it (e.g above a MergeAppend with subplans pushed
+                * to remote nodes). Not sure why it's happening, though ...
+                */
                top_plan = (Plan *) make_remotesubplan(root, top_plan, NULL,
                                                                                           root->distribution,
                                                                                           root->query_pathkeys);