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https://issues.apache.org/jira/browse/HIVE-4523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14105103#comment-14105103
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Zhan Zhang commented on HIVE-4523:
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I also met the same problem with the new round UDF in spark.
org.apache.hadoop.hive.ql.exec.UDFArgumentException: ROUND second argument only
takes constant.
Because when spark init the udf, it does not know this udf needs to be taken
special care. The round should follow the same contract of other UDF, which
needs ObjectInspector, instead of ConstObjectInspector.
Can we file a jira to get this fixed?
> 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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