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https://issues.apache.org/jira/browse/HIVE-11775?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15065302#comment-15065302
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Lefty Leverenz commented on HIVE-11775:
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Doc note: This changes the names and descriptions of three parameters in
HiveConf.java, so the wiki needs to be updated.
* [Configuration Properties -- hive.optimize.limitjointranspose |
https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-hive.optimize.limitjointranspose]
(now *hive.optimize.limittranspose*)
* [Configuration Properties --
hive.optimize.limitjointranspose.reductionpercentage |
https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-hive.optimize.limitjointranspose.reductionpercentage]
(now *hive.optimize.limittranspose.reductionpercentage*)
* [Configuration Properties -- hive.optimize.limitjointranspose.reductiontuples
|
https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-hive.optimize.limitjointranspose.reductiontuples]
(now *hive.optimize.limittranspose.reductiontuples*)
> 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
> 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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