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Posted to issues@spark.apache.org by "Yin Huai (JIRA)" <ji...@apache.org> on 2015/11/06 03:10:27 UTC

[jira] [Resolved] (SPARK-11469) Initial implementation of allowing users to define UDFs that will not be evaluated more than once

     [ https://issues.apache.org/jira/browse/SPARK-11469?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yin Huai resolved SPARK-11469.
------------------------------
    Resolution: Won't Fix

> 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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