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From "Hengyu Dai (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-18304) datediff() UDF returns a wrong result when dealing with a (date, string) input
Date Wed, 20 Dec 2017 15:11:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-18304?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16298619#comment-16298619
] 

Hengyu Dai commented on HIVE-18304:
-----------------------------------

my hive version is 2.1.1, this bug is  already fixed in [HIVE-15338|https://issues.apache.org/jira/browse/HIVE-15338]
close issue, thanks.

> datediff() UDF returns a wrong result when dealing with a (date, string) input
> ------------------------------------------------------------------------------
>
>                 Key: HIVE-18304
>                 URL: https://issues.apache.org/jira/browse/HIVE-18304
>             Project: Hive
>          Issue Type: Bug
>          Components: UDF
>            Reporter: Hengyu Dai
>            Assignee: Hengyu Dai
>            Priority: Minor
>         Attachments: 0001.patch
>
>
> for date type argument, datediff() use DateConverter to convert input to a java Date
object, 
> for example, a '2017-12-18' will get 2017-12-18T00:00:00.000+0800
> for string type argument, datediff() use TextConverter to convert a string to date,
> for '2012-01-01' we will get 2012-01-01T08:00:00.000+0800
> now, datediff() will return a number less than the real date diff
> we should use TextConverter to deal with date input too.
> reproduce:
> {code:java}
> select datediff(cast('2017-12-18' as date), '2012-01-01'); --2177
> select datediff('2017-12-18', '2012-01-01'); --2178
> {code}



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