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https://issues.apache.org/jira/browse/SPARK-16419?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15366281#comment-15366281
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Apache Spark commented on SPARK-16419:
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User 'MasterDDT' has created a pull request for this issue:
https://github.com/apache/spark/pull/14092
> EnsureRequirements adds extra Sort to already sorted cached table
> -----------------------------------------------------------------
>
> Key: SPARK-16419
> URL: https://issues.apache.org/jira/browse/SPARK-16419
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.6.2
> Reporter: Mitesh
> Priority: Minor
>
> EnsureRequirements compares the required and given sort ordering, but uses
> Scala equals instead of a semantic equals, so column capitalization isn't
> considered, and also fails for a cached table. This results in a
> SortMergeJoin of a cached already-sorted table to add an extra sort.
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