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https://issues.apache.org/jira/browse/SPARK-11469?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14992951#comment-14992951
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Yin Huai commented on SPARK-11469:
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Seems it is not very useful flag.
> Initial implementation of allowing users to define UDFs that will not be
> evaluated more than once
> -------------------------------------------------------------------------------------------------
>
> Key: SPARK-11469
> URL: https://issues.apache.org/jira/browse/SPARK-11469
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Yin Huai
>
> Right now, we have a projection collapsing optimization rule, that will
> collapse multiple project operators by evaluating an expression multiple
> times. However, there are cases that we do not want to do it (e.g. for rand).
> This work is to let users define such UDF functions.
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