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https://issues.apache.org/jira/browse/HIVE-18215?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vineet Garg updated HIVE-18215:
-------------------------------
    Fix Version/s:     (was: 3.0.0)
                   3.1.0

Deferring this to 3.1.0 since the branch for 3.0.0 has been cut off. Please 
update the JIRA if you would like to get your patch in 3.0.0.

> Possible code optimization exists for "INSERT OVERWITE on MM table. SELECT 
> FROM (SELECT .. UNION ALL SELECT ..)
> ---------------------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-18215
>                 URL: https://issues.apache.org/jira/browse/HIVE-18215
>             Project: Hive
>          Issue Type: Bug
>          Components: HiveServer2
>    Affects Versions: 3.0.0
>            Reporter: Steve Yeom
>            Assignee: Steve Yeom
>            Priority: Minor
>             Fix For: 3.1.0
>
>
> removeTempOrDuplicateFiles(.) has an opportunity for performance code 
> optimization for the 
> test case of "INSERT OVERWITE on MM table. SELECT FROM (SELECT .. UNION ALL 
> SELECT ..)" from dp_counter_mm.q.
> This is MM table specific and we can avoid calling fs.exists() by creating a 
> specific mmDirectories
> list for the current SELECT statement (out of two SELECTs in our test case 
> from 
> the dp_counter_mm.q) from the IOW union all query.



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