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https://issues.apache.org/jira/browse/HIVE-11684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15000513#comment-15000513
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Jesus Camacho Rodriguez commented on HIVE-11684:
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[~jpullokkaran], new patch (.17) addresses your comments.
* 1. It is not necessary: we push Project through Sort iff we had previously
pushed the Sort through the Project (this is checked through the "pushed"
flag). It is true that all these rules are tightly coupled, but I think we can
go this way at this moment.
* 2., 3.a, and 3.b: addressed. About 3.b, we do not merge multiple Sort
operations at the moment, i.e. the top Sort operator needs to be a pure Limit
operation.
> Implement limit pushdown through outer join in CBO
> --------------------------------------------------
>
> Key: HIVE-11684
> URL: https://issues.apache.org/jira/browse/HIVE-11684
> Project: Hive
> Issue Type: New Feature
> Components: CBO
> Affects Versions: 2.0.0
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Attachments: HIVE-11684.01.patch, HIVE-11684.02.patch,
> HIVE-11684.03.patch, HIVE-11684.04.patch, HIVE-11684.05.patch,
> HIVE-11684.07.patch, HIVE-11684.08.patch, HIVE-11684.09.patch,
> HIVE-11684.10.patch, HIVE-11684.11.patch, HIVE-11684.12.patch,
> HIVE-11684.12.patch, HIVE-11684.14.patch, HIVE-11684.15.patch,
> HIVE-11684.16.patch, HIVE-11684.17.patch, HIVE-11684.patch
>
>
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