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https://issues.apache.org/jira/browse/HIVE-9320?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14275682#comment-14275682
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Laljo John Pullokkaran commented on HIVE-9320:
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[~ashutoshc] Why do we need this (Constant propagation & Null branches?)
i.e why would you end up with union with single input?
> Add UnionEliminatorRule on cbo path
> -----------------------------------
>
> Key: HIVE-9320
> URL: https://issues.apache.org/jira/browse/HIVE-9320
> Project: Hive
> Issue Type: Improvement
> Components: CBO, Logical Optimizer
> Affects Versions: 0.14.0
> Reporter: Ashutosh Chauhan
> Assignee: Ashutosh Chauhan
> Attachments: HIVE-9320.patch
>
>
> Shorten the pipeline, where possible.
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