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https://issues.apache.org/jira/browse/HIVE-7151?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gopal V resolved HIVE-7151.
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Resolution: Duplicate
Closing this as a duplicate of [~rhbutani]'s patch
> 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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