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Posted to dev@hive.apache.org by "Jesus Camacho Rodriguez (JIRA)" <ji...@apache.org> on 2019/03/12 23:25:00 UTC

[jira] [Created] (HIVE-21434) Extend HiveAggregatePullUpConstantsRule to remove all grouping columns if possible

Jesus Camacho Rodriguez created HIVE-21434:
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             Summary: Extend HiveAggregatePullUpConstantsRule to remove all grouping columns if possible
                 Key: HIVE-21434
                 URL: https://issues.apache.org/jira/browse/HIVE-21434
             Project: Hive
          Issue Type: Improvement
          Components: CBO
            Reporter: Jesus Camacho Rodriguez
            Assignee: Jesus Camacho Rodriguez


Currently there is a limitation in the rule implementation.
{code}
...
      // No room for optimization since we cannot convert from non-empty
      // GROUP BY list to the empty one.
...
{code}
The rule extension should try to overcome the limitation by implementing this specific case calculating count(*) on Aggregate and applying Filter on top of it.



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