diff --git a/src/backend/executor/nodeAppend.c b/src/backend/executor/nodeAppend.c
index 246a0b2..4c4355b 100644
--- a/src/backend/executor/nodeAppend.c
+++ b/src/backend/executor/nodeAppend.c
@@ -463,6 +463,12 @@ choose_next_subplan_for_worker(AppendState *node)
 
 	LWLockAcquire(&pstate->pa_lock, LW_EXCLUSIVE);
 
+	elog(LOG, "choose_next_subplan_for_worker: whichplan %d, nextplan %d, fpp %d, nplans %d",
+		 node->as_whichplan,
+		 pstate->pa_next_plan,
+		 append->first_partial_plan,
+		 node->as_nplans);
+
 	/* Mark just-completed subplan as finished. */
 	if (node->as_whichplan != INVALID_SUBPLAN_INDEX)
 		node->as_pstate->pa_finished[node->as_whichplan] = true;
@@ -502,6 +508,11 @@ choose_next_subplan_for_worker(AppendState *node)
 		}
 	}
 
+	elog(LOG, "choose_next_subplan_for_worker: picking nextplan %d, fpp %d, nplans %d",
+		 pstate->pa_next_plan,
+		 append->first_partial_plan,
+		 node->as_nplans);
+
 	/* Pick the plan we found, and advance pa_next_plan one more time. */
 	node->as_whichplan = pstate->pa_next_plan++;
 	if (pstate->pa_next_plan >= node->as_nplans)