[jira] [Assigned] (HIVE-18215) Possible code optimization exists for "INSERT OVERWITE on MM table. SELECT FROM (SELECT .. UNION ALL SELECT ..)

["Steve Yeom (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-18215?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steve Yeom reassigned HIVE-18215:
---------------------------------

    Assignee: Steve Yeom

> 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: 3.0.0
>
>
> 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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