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https://issues.apache.org/jira/browse/SPARK-8599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14600315#comment-14600315
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Burak Yavuz commented on SPARK-8599:
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cc [~marmbrus] [~rxin]

> Use a Random operator to handle Random distribution generating expressions
> --------------------------------------------------------------------------
>
>                 Key: SPARK-8599
>                 URL: https://issues.apache.org/jira/browse/SPARK-8599
>             Project: Spark
>          Issue Type: Improvement
>    Affects Versions: 1.4.0
>            Reporter: Yin Huai
>            Priority: Critical
>
> Right now, we are using expressions for Random distribution generating 
> expressions. But, we have to track them in lots of places in the optimizer to 
> handle them carefully. Otherwise, these expressions will be treated as 
> stateless expressions and have unexpected behaviors (e.g. SPARK-8023). 



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