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