JackieTien97 commented on code in PR #17652:
URL: https://github.com/apache/iotdb/pull/17652#discussion_r3238509018
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iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/planner/distribution/ExchangeNodeAdder.java:
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@@ -237,6 +241,10 @@ public PlanNode visitSingleDeviceView(SingleDeviceViewNode
node, NodeGroupContex
@Override
public PlanNode visitMergeSort(MergeSortNode node, NodeGroupContext context)
{
+ // Force Exchange if any child subtree contains InnerTimeJoin.
+ if (hasInnerTimeJoinInSubtree(node.getChildren())) {
Review Comment:
melt this judgement into previous DFS visit process
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