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https://issues.apache.org/jira/browse/HIVE-11775?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15063018#comment-15063018
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Laljo John Pullokkaran commented on HIVE-11775:
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+1 conditional on clean QA run based on latest patch.
> Implement limit push down through union all in CBO
> --------------------------------------------------
>
> Key: HIVE-11775
> URL: https://issues.apache.org/jira/browse/HIVE-11775
> Project: Hive
> Issue Type: New Feature
> Reporter: Pengcheng Xiong
> Assignee: Pengcheng Xiong
> Attachments: HIVE-11775.01.patch, HIVE-11775.02.patch,
> HIVE-11775.03.patch, HIVE-11775.04.patch, HIVE-11775.05.patch,
> HIVE-11775.06.patch, HIVE-11775.07.patch, HIVE-11775.08.patch,
> HIVE-11775.09.patch, HIVE-11775.10.patch, HIVE-11775.11.patch,
> HIVE-11775.12.patch
>
>
> Enlightened by HIVE-11684 (Kudos to [~jcamachorodriguez]), we can actually
> push limit down through union all, which reduces the intermediate number of
> rows in union branches.
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