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Posted to issues-all@impala.apache.org by "Balazs Jeszenszky (JIRA)" <ji...@apache.org> on 2018/09/19 12:48:00 UTC

[jira] [Created] (IMPALA-7592) Planner should correctly estimate UnionNode host count

Balazs Jeszenszky created IMPALA-7592:
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             Summary: Planner should correctly estimate UnionNode host count
                 Key: IMPALA-7592
                 URL: https://issues.apache.org/jira/browse/IMPALA-7592
             Project: IMPALA
          Issue Type: Improvement
          Components: Frontend
    Affects Versions: Impala 3.0
            Reporter: Balazs Jeszenszky


Currently, the planner estimates UnionNode host count to be the maximum of all its children. In reality, scheduler will put these nodes on the union of its inputs' hosts. We should update the planner to correctly account for this behaviour.



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