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From "Zoltan Haindrich (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-20491) Fix mapjoin size estimations for Fast implementation
Date Wed, 05 Sep 2018 08:10:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-20491?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Zoltan Haindrich updated HIVE-20491:
------------------------------------
       Resolution: Fixed
    Fix Version/s: 4.0.0
           Status: Resolved  (was: Patch Available)

pushed to master. Thank you Ashutosh for reviewing the changes!

> 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
>             Fix For: 4.0.0
>
>         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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