yjhjstz commented on code in PR #1571:
URL: https://github.com/apache/cloudberry/pull/1571#discussion_r2789862682
##########
src/backend/executor/execMain.c:
##########
@@ -2741,6 +2741,18 @@ ExecutePlan(EState *estate,
if (!execute_once || GP_ROLE_DISPATCH == Gp_role)
use_parallel_mode = false;
+ /*
+ * If the plan contains Gather/GatherMerge nodes (parallelModeNeeded),
+ * enable PG-style parallel mode on segments even if CBDB MPP parallel
+ * mode (useMppParallelMode) didn't set it. This ensures ExecGather
+ * can launch parallel workers.
+ */
+ if (!use_parallel_mode &&
+ execute_once &&
+ Gp_role != GP_ROLE_DISPATCH &&
+ estate->es_plannedstmt->parallelModeNeeded)
+ use_parallel_mode = true;
Review Comment:
why change this?
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