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https://issues.apache.org/jira/browse/SPARK-13249?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15192723#comment-15192723
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Liang-Chi Hsieh commented on SPARK-13249:
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I think this can be closed?
> Filter null keys for inner join
> -------------------------------
>
> Key: SPARK-13249
> URL: https://issues.apache.org/jira/browse/SPARK-13249
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Davies Liu
>
> For inner join, the join key with null in it will not match each other, so we
> could insert a Filter before inner join (could be pushed down), then we don't
> need to check nullability of keys while joining.
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