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https://issues.apache.org/jira/browse/HIVE-2642?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13172854#comment-13172854
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Namit Jain commented on HIVE-2642:
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Look at union22.q.out.
map-join followed by union, an extra stage is introduced.
We dont hsve to optimize this - just wanted to make sure it is intentional.
> 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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