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From "Prasad Chakka (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-533) predicate clauses with rand() should not be pushed down
Date Tue, 02 Jun 2009 21:51:07 GMT

    [ https://issues.apache.org/jira/browse/HIVE-533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12715708#action_12715708

Prasad Chakka commented on HIVE-533:

we didn't push rand() but we pushed all other predicates in the clause. so rand() is getting
applied after rows are filtered. the current behavior seems to be rand() gets applied before
rows are filtered. not sure if there is a ANSI semantics, but this fix keeps the current behavior
of Hive even when PPD is applied.

> predicate clauses with rand() should not be pushed down
> -------------------------------------------------------
>                 Key: HIVE-533
>                 URL: https://issues.apache.org/jira/browse/HIVE-533
>             Project: Hadoop Hive
>          Issue Type: Bug
>          Components: Query Processor
>    Affects Versions: 0.4.0
>            Reporter: Prasad Chakka
>            Assignee: Prasad Chakka
> in the following query, all predicates except the rand() is pushed down where in rand()
is applied after filter which should not be the case.
> select a.* from srcpart a where rand(1) < 0.1 and a.ds = '2008-04-08' and not(key
> 50 or key < 10) and a.hr like '%2';

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