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From "Ashutosh Chauhan (JIRA)" <>
Subject [jira] [Commented] (HIVE-20503) Use datastructure aware estimations during mapjoin selection
Date Fri, 07 Sep 2018 06:00:06 GMT


Ashutosh Chauhan commented on HIVE-20503:

Actually longer term we will abandon optimized hashtable altogether. We cant just yet because
fast doesnt support decimals yet. With 20491 we do estimates using fast which is more conservative.
So, I think  its not worth the complexity in compiler to account for fast vs optimized. I
think we can stop at HIVE-20491 and not pursue this any further. Fast will also be made more
memory efficient with HIVE-20513 . 

> Use datastructure aware estimations during mapjoin selection
> ------------------------------------------------------------
>                 Key: HIVE-20503
>                 URL:
>             Project: Hive
>          Issue Type: Bug
>          Components: Statistics
>            Reporter: Zoltan Haindrich
>            Assignee: Zoltan Haindrich
>            Priority: Major
>         Attachments: HIVE-20503.01.patch, HIVE-20503.01wip01.patch, HIVE-20503.01wip01.patch,

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