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https://issues.apache.org/jira/browse/SPARK-9448?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14646839#comment-14646839
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Apache Spark commented on SPARK-9448:
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User 'rxin' has created a pull request for this issue:
https://github.com/apache/spark/pull/7759
> GenerateUnsafeProjection should not share expressions across instances
> ----------------------------------------------------------------------
>
> Key: SPARK-9448
> URL: https://issues.apache.org/jira/browse/SPARK-9448
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Reynold Xin
> Assignee: Reynold Xin
> Priority: Blocker
>
> We accidentally moved the list of expressions from the generated code
> instance to the class wrapper, and as a result, different threads are sharing
> the same set of expressions, which cause problems when the expressions have
> mutable state.
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