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https://issues.apache.org/jira/browse/SPARK-19994?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15931546#comment-15931546
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Apache Spark commented on SPARK-19994:
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User 'wzhfy' has created a pull request for this issue:
https://github.com/apache/spark/pull/17331
> Wrong outputOrdering for right/full outer smj
> ---------------------------------------------
>
> Key: SPARK-19994
> URL: https://issues.apache.org/jira/browse/SPARK-19994
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Zhenhua Wang
>
> For right outer join, values of the left key will be filled with nulls if it
> can't match the value of the right key, so `nullOrdering` of the left key
> can't be guaranteed. We should output right key order.
> For full outer join, neither left key nor right key guarantees
> `nullOrdering`. We should not output any ordering.
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