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https://issues.apache.org/jira/browse/HIVE-4523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14012060#comment-14012060
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Xuefu Zhang commented on HIVE-4523:
-----------------------------------
Yes, the new round UDF restricted to a constant scale parameter so as to have
deterministic result metadata. This is especially important for decimal
rounding. If desirable, this is can be fixed to support variable scale.
However, special care is needed w.r.t decimal rounding.
> round() function with specified decimal places not consistent with mysql
> -------------------------------------------------------------------------
>
> Key: HIVE-4523
> URL: https://issues.apache.org/jira/browse/HIVE-4523
> Project: Hive
> Issue Type: Improvement
> Components: UDF
> Affects Versions: 0.7.1
> Reporter: Fred Desing
> Assignee: Xuefu Zhang
> Priority: Minor
> Fix For: 0.13.0
>
> Attachments: HIVE-4523.1.patch, HIVE-4523.2.patch, HIVE-4523.3.patch,
> HIVE-4523.4.patch, HIVE-4523.5.patch, HIVE-4523.6.patch, HIVE-4523.7.patch,
> HIVE-4523.8.patch, HIVE-4523.patch
>
>
> // hive
> hive> select round(150.000, 2) from temp limit 1;
> 150.0
> hive> select round(150, 2) from temp limit 1;
> 150.0
> // mysql
> mysql> select round(150.000, 2) from DUAL limit 1;
> round(150.000, 2)
> 150.00
> mysql> select round(150, 2) from DUAL limit 1;
> round(150, 2)
> 150
> http://dev.mysql.com/doc/refman/5.1/en/mathematical-functions.html#function_round
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