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From "Laljo John Pullokkaran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-9320) Add UnionEliminatorRule on cbo path
Date Tue, 13 Jan 2015 18:42:34 GMT

    [ https://issues.apache.org/jira/browse/HIVE-9320?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14275682#comment-14275682
] 

Laljo John Pullokkaran commented on HIVE-9320:
----------------------------------------------

[~ashutoshc] Why do we need this (Constant propagation & Null branches?)
i.e why would you end up with union with single input?

> 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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