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