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From "Zheng Shao (JIRA)" <j...@apache.org>
Subject [jira] Created: (HIVE-790) race condition related to ScriptOperator + UnionOperator
Date Tue, 25 Aug 2009 00:56:59 GMT
race condition related to ScriptOperator + UnionOperator
--------------------------------------------------------

                 Key: HIVE-790
                 URL: https://issues.apache.org/jira/browse/HIVE-790
             Project: Hadoop Hive
          Issue Type: Bug
            Reporter: Zheng Shao


ScriptOperator uses a second thread to output the rows to the children operators. In a corner
case which contains a union, 2 threads might be outputting data into the same operator hierarchy
and caused race conditions.

{code}
SELECT *
FROM (
    SELECT TRANSFORM(cola)
    USING 'cat'
    AS cola
    FROM tablea
  UNION ALL
    SELECT cola
    FROM tablea
) a;
{code}


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