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https://issues.apache.org/jira/browse/HIVE-21081?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16765672#comment-16765672
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Rahul Pathak commented on HIVE-21081:
-------------------------------------
This looks like expected behavior.
Y represent week year and y is used to represent calendar year.
A week year is in sync with a WEEK_OF_YEAR cycle.
All weeks between the first and last weeks (inclusive) have the same week year
value.
Therefore, the first and last days of a week year may have different calendar
year values.
https://docs.oracle.com/javase/9/docs/api/java/util/GregorianCalendar.html#week_year
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF
> DATE_FORMAT incorrectly returns results on the last week of the calendar year
> -----------------------------------------------------------------------------
>
> Key: HIVE-21081
> URL: https://issues.apache.org/jira/browse/HIVE-21081
> Project: Hive
> Issue Type: Bug
> Components: Hive
> Affects Versions: 2.1.1, 2.3.2, 2.3.3
> Reporter: Wilson Lu
> Priority: Minor
>
> The Hive DATE_FORMAT does not perform the correct operation on the last week
> of the calendar year. The following statements incorrectly formats the data:
> select DATE_FORMAT('2017-12-31', 'YYYYMM')
> select DATE_FORMAT('2018-12-30', 'YYYYMM')
> select DATE_FORMAT('2018-12-31', 'YYYYMM')
> select DATE_FORMAT('2019-12-29', 'YYYYMM')
> select DATE_FORMAT('2019-12-30', 'YYYYMM')
> select DATE_FORMAT('2019-12-31', 'YYYYMM')
> select DATE_FORMAT( '2019-12-29', 'YYYYMMdd')
>
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