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From "Phabricator (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-2642) fix Hive-2566 and make union optimization more aggressive
Date Mon, 19 Dec 2011 03:46:31 GMT

    [ https://issues.apache.org/jira/browse/HIVE-2642?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13172020#comment-13172020
] 

Phabricator commented on HIVE-2642:
-----------------------------------

njain has commented on the revision "HIVE-2642 [jira] fix Hive-2566 and make union optimization
more aggressive".

  still reviewing

INLINE COMMENTS
  ql/src/java/org/apache/hadoop/hive/ql/optimizer/GenMRProcContext.java:105 can you add some
comments here ?

  This is not really the top operators - this contains the list of intermediate tables also.
This code is difficult to debug later on, so more comments would be helpful

REVISION DETAIL
  https://reviews.facebook.net/D735

                
> fix Hive-2566 and make union optimization more aggressive 
> ----------------------------------------------------------
>
>                 Key: HIVE-2642
>                 URL: https://issues.apache.org/jira/browse/HIVE-2642
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: He Yongqiang
>            Assignee: He Yongqiang
>         Attachments: HIVE-2642.D735.1.patch
>
>
> Hive-2566 did some optimizations to union, but cause some problems. And then got reverted.
This is to get it back and fix the problems we saw, and also make union optimization more
aggressive.

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