[jira] [Commented] (HIVE-22099) GenericUDFDateFormat can't handle Julian dates properly

["Adam Szita (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-22099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16905016#comment-16905016 ] 

Adam Szita commented on HIVE-22099:
-----------------------------------

Note that the change introduces java.time.format.DateTimeFormatter to be used instead of java.text.SimpleDateFormat. Although most formats are denoted the same way, there are a few differences, e.g. how number of the day within the week can be printed - thus adding backward-incompatible label.

 

[~jcamachorodriguez], can you take a look please?

> GenericUDFDateFormat can't handle Julian dates properly
> -------------------------------------------------------
>
>                 Key: HIVE-22099
>                 URL: https://issues.apache.org/jira/browse/HIVE-22099
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Adam Szita
>            Assignee: Adam Szita
>            Priority: Major
>              Labels: backward-incompatible
>         Attachments: HIVE-22099.0.patch
>
>
> Currently dates that belong to Julian calendar (before Oct 15, 1582) are handled improperly by DateFormat UDF:
> Although the dates are in Julian calendar, the formatter insists to print these according to Gregorian calendar causing multiple days of difference in some cases:
>  
> {code:java}
> beeline> select date_format('1001-01-05','dd---MM--yyyy');
> +----------------+
> | _c0 |
> +----------------+
> | 30---12--1000 |
> +----------------+{code}
>  
>  



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