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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