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https://issues.apache.org/jira/browse/HIVE-9320?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14275861#comment-14275861
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Ashutosh Chauhan commented on HIVE-9320:
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yeah.. it is for null branches. Its true that we don't generate plans with null
branches (in a way eligible for this particular rule) so we can postpone adding
this rule. But sooner or later we will, so I thought its good to have this
rule. If you think its better to not add the rule now, thats fine too. I am ok
either way.
> 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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