[jira] [Commented] (HIVE-12812) Enable mapred.input.dir.recursive by default to support union with aggregate function

["Wang Haihua (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-12812?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16658913#comment-16658913 ] 

Wang Haihua commented on HIVE-12812:
------------------------------------

For those who use tez and mapreduce mixed in Hive, you should use the old patch instead of patch merged.

> Enable mapred.input.dir.recursive by default to support union with aggregate function
> -------------------------------------------------------------------------------------
>
>                 Key: HIVE-12812
>                 URL: https://issues.apache.org/jira/browse/HIVE-12812
>             Project: Hive
>          Issue Type: Bug
>          Components: Hive
>    Affects Versions: 1.2.1, 2.1.0
>            Reporter: Chaoyu Tang
>            Assignee: Alice Fan
>            Priority: Major
>             Fix For: 4.0.0
>
>         Attachments: HIVE-12812.1.patch, HIVE-12812.2.patch, HIVE-12812.patch, HIVE-12812.patch, HIVE-12812.patch
>
>
> When union remove optimization is enabled, union query with aggregate function writes its subquery intermediate results to subdirs which needs mapred.input.dir.recursive to be enabled in order to be fetched. This property is not defined by default in Hive and often ignored by user, which causes the query failure and is hard to be debugged.
> So we need set mapred.input.dir.recursive to true whenever union remove optimization is enabled.



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