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https://issues.apache.org/jira/browse/SPARK-7611?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15556417#comment-15556417
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Xiao Li commented on SPARK-7611:
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Now, we can support EqualNullSafe in ExtractEquiJoinKeys. Thanks!
> Support HashJoin if the join condition uses eqNullSafe/<=>
> ----------------------------------------------------------
>
> Key: SPARK-7611
> URL: https://issues.apache.org/jira/browse/SPARK-7611
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 1.3.1
> Reporter: David Tolnay
>
> Currently ExtractEquiJoinKeys only looks for EqualTo, not EqualNullSafe. So
> if your join condition uses eqNullSafe/<=> instead of equalTo/===, you end up
> with the CartesianProduct strategy instead of HashJoin.
> This requires many changes under org.apache.spark.sql.execution.joins, where
> code assumes rows can only join "if (!key.anyNull)".
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