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https://issues.apache.org/jira/browse/HIVE-18021?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16419880#comment-16419880
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Sergey Shelukhin commented on HIVE-18021:
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Is there a correctness problem from separate directories?
> Insert overwrite on acid table with Union All optimizations
> -----------------------------------------------------------
>
> Key: HIVE-18021
> URL: https://issues.apache.org/jira/browse/HIVE-18021
> Project: Hive
> Issue Type: Bug
> Components: Transactions
> Affects Versions: 3.0.0
> Reporter: Eugene Koifman
> Priority: Major
>
> This is a followup from HIVE-14988.
> T is unbucketed acid table
> {noformat}
> insert into T select a,b from S union all select a,b from S1
> {noformat}
> will create a separate subdirectory for each leg of the union in the target
> table
> (automatically on Tez, with some props enabled on MR)
> Regular Insert will make each subdirectory be a delta_x_x_0, delta_x_x_1.
> See HIVE-15899.
> There is no such suffix mechanism for base_x/.
> Need to figure how this should work.
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