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https://issues.apache.org/jira/browse/HIVE-11775?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15065555#comment-15065555
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Pengcheng Xiong commented on HIVE-11775:
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[~leftylev], thanks for your reminder. I have modified accordingly, could you
take a look and remove the label? Thanks.
> 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
> Affects Versions: 1.2.1
> Reporter: Pengcheng Xiong
> Assignee: Pengcheng Xiong
> Labels: TODOC2.0
> Fix For: 2.0.0, 2.1.0
>
> 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, HIVE-11775.13.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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