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https://issues.apache.org/jira/browse/HIVE-205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12660781#action_12660781
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Ashish Thusoo commented on HIVE-205:
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what happens in the test
./ql/src/test/queries/clientpositive/union.q
the seems to have the same general pattern as the reported query...
> file sink operator needs unique file names
> ------------------------------------------
>
> Key: HIVE-205
> URL: https://issues.apache.org/jira/browse/HIVE-205
> Project: Hadoop Hive
> Issue Type: Bug
> Components: Query Processor
> Reporter: Zheng Shao
>
> a query like "SELECT * FROM (SELECT 'a' from table UNION ALL SELECT 'b' from
> table) c" will fail, because the 2 sub queries of "UNION" will be executed
> inside the same mapper (because the input is the same) towards the same
> destination table, and the 2 file sink operators will have the same output
> file name.
> We need to append the file sink operator id to the file name to make it
> unique.
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