[jira] Assigned: (HIVE-253) rand() gets precomputated in compilation phase

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

     [ https://issues.apache.org/jira/browse/HIVE-253?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ashish Thusoo reassigned HIVE-253:
----------------------------------

    Assignee: Ashish Thusoo

> rand() gets precomputated in compilation phase
> ----------------------------------------------
>
>                 Key: HIVE-253
>                 URL: https://issues.apache.org/jira/browse/HIVE-253
>             Project: Hadoop Hive
>          Issue Type: Bug
>          Components: Query Processor
>    Affects Versions: 0.2.0
>            Reporter: Zheng Shao
>            Assignee: Ashish Thusoo
>            Priority: Blocker
>             Fix For: 0.2.0
>
>
> SELECT * FROM t WHERE rand() < 0.01;
> Hive will say: "No need to submit job", because the condition evaluates to false.
> The rand() function is special in the sense that every time it evaluates to a different value. We should disallow computing the value in the compiling phase.
> One way to do that is to add an annotation in the UDFRand and check that in the compiling phase.

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