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https://issues.apache.org/jira/browse/HIVE-790?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Zheng Shao updated HIVE-790:
----------------------------
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.
{code}
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;
{code}
was:
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}
> 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}
> 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;
> {code}
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