EmmyMiao87 commented on pull request #5521:
URL: https://github.com/apache/incubator-doris/pull/5521#issuecomment-803734110
> seems not need return null too many, may under code is better:
>
> ```
> if (this instanceof ScanNode && tupleIds.contains(tupleId)) {
> return (ScanNode) this;
> } else if (!(this instanceof ExchangeNode)) {
> for (PlanNode planNode : children) {
> ScanNode scanNode =
planNode.getScanNodeInOneFragmentByTupleId(tupleId);
> if (scanNode != null) {
> return scanNode;
> }
> }
> }
> return null;
> ```
changed
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