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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