[jira] [Created] (SPARK-30857) Wrong truncations of timestamps before the epoch to hours and days

["Maxim Gekk (Jira)" <ji...@apache.org>]

Maxim Gekk created SPARK-30857:
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             Summary: 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: 2.4.5
            Reporter: Maxim Gekk


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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