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From "Zoltan Haindrich (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-20491) Fix mapjoin size estimations for Fast implementation
Date Tue, 04 Sep 2018 16:14:12 GMT

    [ https://issues.apache.org/jira/browse/HIVE-20491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16603259#comment-16603259
] 

Zoltan Haindrich commented on HIVE-20491:
-----------------------------------------

yes; I was planning to do that - right now this patch only fixes the estimations; and sets
the most conservative estimate(fast3) by default.

I'm still working on deciding and forwarding that decision...right now I think that will not
be in this patch....

> Fix mapjoin size estimations for Fast implementation
> ----------------------------------------------------
>
>                 Key: HIVE-20491
>                 URL: https://issues.apache.org/jira/browse/HIVE-20491
>             Project: Hive
>          Issue Type: Improvement
>          Components: Statistics
>            Reporter: Zoltan Haindrich
>            Assignee: Zoltan Haindrich
>            Priority: Major
>         Attachments: HIVE-20491.01.patch, HIVE-20491.01wip02.patch, HIVE-20491.02.patch
>
>
> HIVE-19824 have fixed the estimations; but it calculated for the "optimized" impl; the
"fast" one has a little bit bigger footprint.
> It also seems like fast is a bit overestimated at runtime...that should be also taken
care of.
> | numkeys | implementation | compiler estimation | runtime estimation | runtime measurement
| ce / rm | re / rm |
> | 25M | FAST | 1168435456 | 2189433712 | 1513584984 | .77 | 1.44 |
> | 25M | OPTIMIZED | 1168435456 | 1191203764 | 1168439664 | 100% | 1.01 |



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