[jira] [Commented] (HIVE-7314) Wrong results of UDF when hive.cache.expr.evaluation is set

["Navis (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-7314?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14048494#comment-14048494 ] 

Navis commented on HIVE-7314:
-----------------------------

Currently, expr cache is applied per column basis for SELECT op. Seemed to be extended to apply it cross columns.

> Wrong results of UDF when hive.cache.expr.evaluation is set
> -----------------------------------------------------------
>
>                 Key: HIVE-7314
>                 URL: https://issues.apache.org/jira/browse/HIVE-7314
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 0.12.0, 0.13.0, 0.13.1
>            Reporter: dima machlin
>            Assignee: Navis
>         Attachments: HIVE-7314.1.patch.txt
>
>
> It seems that the expression caching doesn't work when using UDF inside another UDF or a hive function.
> For example :
> tbl has one row : 'a','b'
> The following query :
> {code:sql} select concat(custUDF(a),' ', custUDF(b)) from tbl; {code}
> returns 'a a'
> seems to cache custUDF(a)  and use it for custUDF(b).
> Same query without the concat works fine.
> Replacing the concat with another custom UDF also returns 'a a'



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