file sink operator needs unique file names
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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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