Zoltan Haindrich created HIVE-25311:
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             Summary: Slow compilation of union operators with >100 branches
                 Key: HIVE-25311
                 URL: https://issues.apache.org/jira/browse/HIVE-25311
             Project: Hive
          Issue Type: Improvement
            Reporter: Zoltan Haindrich
            Assignee: Zoltan Haindrich


during the processing of an N way union operator the full plan is cloned N 
times; which might hurt compilation time performance



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