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https://issues.apache.org/jira/browse/HIVE-6956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13977564#comment-13977564
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Ashutosh Chauhan commented on HIVE-6956:
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+1
> Duplicate partitioning column for union when dynamic partition sort
> optimization is enabled
> -------------------------------------------------------------------------------------------
>
> Key: HIVE-6956
> URL: https://issues.apache.org/jira/browse/HIVE-6956
> Project: Hive
> Issue Type: Bug
> Affects Versions: 0.13.0, 0.14.0
> Reporter: Prasanth J
> Assignee: Prasanth J
> Labels: optimization
> Attachments: HIVE-6956.1.patch
>
>
> HIVE-6455 optimization uses PreOrder graph walker resulting in double
> invocation of SortedDynPartitionOptimizer(). Because of this there are
> duplicate partitioning columns in RSOp for few test cases (union_remove_17.q
> and similar test cases..)..
> HIVE-6455 optimization does not actually need a PreOrder graph walker. The
> fix is to revert it to DefaultGraphWalker.
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