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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-9030) CBO: Plans with comparison of values with different types
Date Sat, 06 Dec 2014 00:14:13 GMT

    [ https://issues.apache.org/jira/browse/HIVE-9030?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14236343#comment-14236343
] 

Ashutosh Chauhan commented on HIVE-9030:
----------------------------------------

This I think is a useful change. Because of casts introduced on cbo path, this comparison
became known at compile time to Hive and thus Hive was able to emit this warning. On non-cbo,
comparison would have still happened, but rather implicitly at runtime and Hive would miss
the opportunity to generate this warning. 
My suggestion is to close this as 'Not a problem'.

> CBO: Plans with comparison of values with different types
> ---------------------------------------------------------
>
>                 Key: HIVE-9030
>                 URL: https://issues.apache.org/jira/browse/HIVE-9030
>             Project: Hive
>          Issue Type: Sub-task
>          Components: CBO
>    Affects Versions: 0.15.0
>            Reporter: Jesus Camacho Rodriguez
>              Labels: cbo
>             Fix For: 0.15.0
>
>
> If CBO is enabled, tests {{correlationoptimizer8.q}} and {{filter_join_breaktask2.q}}
throw the following warning:
> {noformat}
> WARNING: Comparing a bigint and a string may result in a loss of precision.
> {noformat}



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