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https://issues.apache.org/jira/browse/HIVE-308?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12677500#action_12677500
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Zheng Shao commented on HIVE-308:
---------------------------------
Explain extended also shows 2 file sink operator. But it's possible that there
is only 2 and get displayed TWICE (and also initialized TWICE during query
execution)
> UNION ALL should create different destination directories for different
> operands
> --------------------------------------------------------------------------------
>
> Key: HIVE-308
> URL: https://issues.apache.org/jira/browse/HIVE-308
> Project: Hadoop Hive
> Issue Type: Bug
> Components: Query Processor
> Affects Versions: 0.2.0, 0.3.0
> Reporter: Zheng Shao
> Priority: Blocker
>
> The following query hangs:
> {code}
> select * from (select 1 from zshao_lazy union all select 2 from zshao_lazy) a;
> {code}
> The following query produce wrong results: (one map-reduce job
> overwrite/cannot overwrite the result of the other)
> {code}
> select * from (select 1 as id from zshao_lazy cluster by id union all select
> 2 as id from zshao_meta) a;
> {code}
> The reason of both is that the destination directory of the file sink
> operator conflicts with each other.
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