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Date: Sat, 14 Mar 2009 21:54:50 -0700 (PDT)
From: "Raghotham Murthy (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
Subject: [jira] Updated: (HIVE-253) rand() gets precomputated in compilation
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     [ https://issues.apache.org/jira/browse/HIVE-253?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Raghotham Murthy updated HIVE-253:
----------------------------------

    Status: Patch Available  (was: Open)

> 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: Raghotham Murthy
>            Priority: Blocker
>             Fix For: 0.2.0
>
>         Attachments: hive-253.1.patch
>
>
> 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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