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https://issues.apache.org/jira/browse/HIVE-790?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12748229#action_12748229
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Zheng Shao commented on HIVE-790:
---------------------------------
@Hive-790.patch:
1547: If this operator can be closed only if all parents are in the state
FINISHED.
An extra "If" at the beginning?
Do we need a new state? I think "CLOSE" is enough - it means CLOSE is called on
an operator. A child just need to check if all parents' states are CLOSE.
We just need another function "areAllParentsClosed".
The result of the test case is non-deterministic. Can you add a "SORT BY" at
the end?
> 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
> Assignee: Ning Zhang
> Attachments: Hive-790.patch
>
>
> 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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