diff --git a/src/backend/executor/nodeGather.c b/src/backend/executor/nodeGather.c
index e4cfc44..ed9c71f 100644
--- a/src/backend/executor/nodeGather.c
+++ b/src/backend/executor/nodeGather.c
@@ -312,6 +312,7 @@ gather_getnext(GatherState *gatherstate)
 
 		if (gatherstate->need_to_scan_locally)
 		{
+			elog(LOG, "EXECLOCAL");
 			outerTupleSlot = ExecProcNode(outerPlan);
 
 			if (!TupIsNull(outerTupleSlot))
@@ -385,15 +386,18 @@ gather_readnext(GatherState *gatherstate)
 
 		/* Have we visited every (surviving) TupleQueueReader? */
 		nvisited++;
+		elog(LOG, "NEXT");
 		if (nvisited >= gatherstate->nreaders)
 		{
 			/*
 			 * If (still) running plan locally, return NULL so caller can
 			 * generate another tuple from the local copy of the plan.
 			 */
+			elog(LOG, "WAIT0");
 			if (gatherstate->need_to_scan_locally)
 				return NULL;
 
+			elog(LOG, "WAIT");
 			/* Nothing to do except wait for developments. */
 			WaitLatch(MyLatch, WL_LATCH_SET, 0);
 			ResetLatch(MyLatch);
diff --git a/src/include/nodes/relation.h b/src/include/nodes/relation.h
index fcfb0d4..b6b9779 100644
--- a/src/include/nodes/relation.h
+++ b/src/include/nodes/relation.h
@@ -1189,7 +1189,7 @@ typedef struct GatherPath
 {
 	Path		path;
 	Path	   *subpath;		/* path for each worker */
-	bool		single_copy;	/* path must not be executed >1x */
+	bool		single_copy;	/* path must not span on multiple processes */
 } GatherPath;
 
 /*