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https://issues.apache.org/jira/browse/SPARK-13337?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15175097#comment-15175097
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Xiao Li commented on SPARK-13337:
---------------------------------
What is the null columns? If you are using full outer joins, all the columns in
the result sets of joins could be null columns.
> DataFrame join-on-columns function should support null-safe equal
> -----------------------------------------------------------------
>
> Key: SPARK-13337
> URL: https://issues.apache.org/jira/browse/SPARK-13337
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 1.6.0
> Reporter: Zhong Wang
> Priority: Minor
>
> Currently, the join-on-columns function:
> {code}
> def join(right: DataFrame, usingColumns: Seq[String], joinType: String):
> DataFrame
> {code}
> performs a null-insafe join. It would be great if there is an option for
> null-safe join.
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