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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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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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