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https://issues.apache.org/jira/browse/SPARK-30857?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Wenchen Fan resolved SPARK-30857.
---------------------------------
Fix Version/s: 2.4.6
Resolution: Fixed
Issue resolved by pull request 27612
[https://github.com/apache/spark/pull/27612]
> Wrong truncations of timestamps before the epoch to hours and days
> ------------------------------------------------------------------
>
> Key: SPARK-30857
> URL: https://issues.apache.org/jira/browse/SPARK-30857
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.3.0, 2.3.4, 2.4.5
> Reporter: Maxim Gekk
> Assignee: Maxim Gekk
> Priority: Major
> Labels: correctness
> Fix For: 2.4.6
>
>
> Truncations to seconds and minutes of timestamps after the epoch are correct:
> {code:sql}
> spark-sql> select date_trunc('HOUR', '2020-02-11 00:01:02.123'),
> date_trunc('HOUR', '2020-02-11 00:01:02.789');
> 2020-02-11 00:00:00 2020-02-11 00:00:00
> {code}
> but truncations of timestamps before the epoch are incorrect:
> {code:sql}
> spark-sql> select date_trunc('HOUR', '1960-02-11 00:01:02.123'),
> date_trunc('HOUR', '1960-02-11 00:01:02.789');
> 1960-02-11 01:00:00 1960-02-11 01:00:00
> {code}
> The result must be *1960-02-11 00:00:00 1960-02-11 00:00:00*
> The same for the DAY level:
> {code:sql}
> spark-sql> select date_trunc('DAY', '1960-02-11 00:01:02.123'),
> date_trunc('DAY', '1960-02-11 00:01:02.789');
> 1960-02-12 00:00:00 1960-02-12 00:00:00
> {code}
> The result must be *1960-02-11 00:00:00 1960-02-11 00:00:00*
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