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