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https://issues.apache.org/jira/browse/SPARK-22746?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16284793#comment-16284793
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Apache Spark commented on SPARK-22746:
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User 'kiszk' has created a pull request for this issue:
https://github.com/apache/spark/pull/19937
> Avoid the generation of useless mutable states by SortMergeJoin
> ---------------------------------------------------------------
>
> Key: SPARK-22746
> URL: https://issues.apache.org/jira/browse/SPARK-22746
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: Kazuaki Ishizaki
>
> Generated code in {{SortMergeJoin}} uses global mutable variables to extend
> lifetime of variables in a nested loop. The generated code can use local
> variables instead of global mutable variables.
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