[GitHub] [incubator-doris] kangkaisen edited a comment on issue #4772: [Bug] UNION ALL query return wrong empty set

[GitBox <gi...@apache.org>]

kangkaisen edited a comment on issue #4772:
URL: https://github.com/apache/incubator-doris/issues/4772#issuecomment-716987878


   @ccoffline Sorry. you could add this method to `PlanNode`:
   
   ```
       protected List<TupleId> getAllScanTupleIds() {
           List<TupleId> tupleIds = Lists.newArrayList();
           List<ScanNode> scanNodes = Lists.newArrayList();
           collectAll(Predicates.instanceOf(ScanNode.class), scanNodes);
           for(ScanNode node: scanNodes) {
               tupleIds.addAll(node.getTupleIds());
           }
           return tupleIds;
       }
   ```


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