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From "Namit Jain (Commented) (JIRA)" <>
Subject [jira] [Commented] (HIVE-2642) fix Hive-2566 and make union optimization more aggressive
Date Tue, 20 Dec 2011 02:11:32 GMT


Namit Jain commented on HIVE-2642:

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:
>             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

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