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Posted to dev@hive.apache.org by "Kevin Wilfong (JIRA)" <ji...@apache.org> on 2012/06/29 22:23:44 UTC

[jira] [Commented] (HIVE-2378) Warn user that precision is lost when bigint is implicitly cast to double.

    [ https://issues.apache.org/jira/browse/HIVE-2378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13404172#comment-13404172 ] 

Kevin Wilfong commented on HIVE-2378:
-------------------------------------

As part of HIVE-2427 I want to make this controlled by a new config hive.mapred.bigint.comparison.mode instead of hive.mapred.mode because hive.mapred.mode is used to control too many things.
                
> Warn user that precision is lost when bigint is implicitly cast to double.
> --------------------------------------------------------------------------
>
>                 Key: HIVE-2378
>                 URL: https://issues.apache.org/jira/browse/HIVE-2378
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Kevin Wilfong
>            Assignee: Kevin Wilfong
>             Fix For: 0.8.0
>
>         Attachments: HIVE-2378.1.patch.txt, HIVE-2378.2.patch.txt, HIVE-2378.3.patch.txt
>
>
> When a bigint is implicitly cast to a double (when a bigint is involved in an equality expression with a string or double) precision may be lost, resulting in unexpected behavior.  Until we fix the underlying issue we should throw an error in strict mode, and a warning in nonstrict mode alerting the user about this.

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