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From "Zheng Shao (JIRA)" <>
Subject [jira] Commented: (HIVE-205) file sink operator needs unique file names
Date Mon, 05 Jan 2009 19:23:44 GMT


Zheng Shao commented on HIVE-205:

The test runs in a different mode I think. I remember the output file names of the tests looks
different from what the file names are from the jobs on the cluster.

> file sink operator needs unique file names
> ------------------------------------------
>                 Key: HIVE-205
>                 URL:
>             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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