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Posted to dev@hive.apache.org by "Vineet Garg (JIRA)" <ji...@apache.org> on 2018/10/30 21:30:00 UTC

[jira] [Created] (HIVE-20842) Fix logic introduced in HIVE-20660 to estimate statistics for group by

Vineet Garg created HIVE-20842:
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             Summary: Fix logic introduced in HIVE-20660 to estimate statistics for group by
                 Key: HIVE-20842
                 URL: https://issues.apache.org/jira/browse/HIVE-20842
             Project: Hive
          Issue Type: Bug
          Components: Statistics
    Affects Versions: 4.0.0
            Reporter: Vineet Garg
            Assignee: Vineet Garg


HIVE-20660 introduced better estimation for group by operator. But the logic did not account for Partial and Full group by separately.
For partial group by parallelism (i.e. number of tasks) should be taken into account.



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