[jira] Commented: (HIVE-790) race condition related to ScriptOperator + UnionOperator

["He Yongqiang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-790?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12747455#action_12747455 ] 

He Yongqiang commented on HIVE-790:
-----------------------------------

This query can not be compiled with the truck 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}
> SELECT *
> FROM (
>     SELECT TRANSFORM(cola)
>     USING 'cat'
>     AS cola
>     FROM tablea
>   UNION ALL
>     SELECT cola
>     FROM tablea
> ) a;
> {code}

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