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https://issues.apache.org/jira/browse/SPARK-9020?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14625929#comment-14625929
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Apache Spark commented on SPARK-9020:
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User 'cloud-fan' has created a pull request for this issue:
https://github.com/apache/spark/pull/7392
> Support mutable state in code gen expressions
> ---------------------------------------------
>
> Key: SPARK-9020
> URL: https://issues.apache.org/jira/browse/SPARK-9020
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Reynold Xin
> Assignee: Wenchen Fan
>
> Some expressions have state in them (e.g. Rand, MonotonicallyIncreasingID).
> We currently don't support code-gen any expressions that have mutable states.
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