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Posted to dev@hive.apache.org by "Gopal V (JIRA)" <ji...@apache.org> on 2014/05/30 20:27:01 UTC

[jira] [Created] (HIVE-7151) NULL keys should not be shuffled for inner equi joins

Gopal V created HIVE-7151:
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             Summary: NULL keys should not be shuffled for inner equi joins
                 Key: HIVE-7151
                 URL: https://issues.apache.org/jira/browse/HIVE-7151
             Project: Hive
          Issue Type: Bug
          Components: Query Processor
    Affects Versions: 0.14.0
            Reporter: Gopal V


There is a huge skew in reducer load for NULL keys in shuffle joins, resulting in one slow reducer out of many.

The NULL keys will not contribute towards the inner JOIN condition for equality (unless using null-safes).




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