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https://issues.apache.org/jira/browse/HIVE-21081?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wilson Lu resolved HIVE-21081.
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Resolution: Not A Problem
> 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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