Details
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Type:
Bug
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Status: Closed
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Priority:
Major
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Resolution: Fixed
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Affects Version/s: None
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Fix Version/s: 0.4.0
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Component/s: Query Processor
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Labels:None
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Hadoop Flags:Reviewed
Description
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.
CREATE TABLE tablea (cola STRING);
SELECT *
FROM (
SELECT TRANSFORM(cola)
USING 'cat'
AS cola
FROM tablea
UNION ALL
SELECT cola as cola
FROM tablea
) a;