Maxim Gekk created SPARK-30793:
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Summary: Wrong truncations of timestamps before the epoch to
minutes and seconds
Key: SPARK-30793
URL: https://issues.apache.org/jira/browse/SPARK-30793
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 3.0.0
Reporter: Maxim Gekk
Truncations to seconds and minutes of timestamps after the epoch are correct:
{code:sql}
spark-sql> select date_trunc('SECOND', '2020-02-11 00:01:02.123'),
date_trunc('SECOND', '2020-02-11 00:01:02.789');
2020-02-11 00:01:02 2020-02-11 00:01:02
{code}
but truncations of timestamps before the epoch are incorrect:
{code:sql}
spark-sql> select date_trunc('SECOND', '1960-02-11 00:01:02.123'),
date_trunc('SECOND', '1960-02-11 00:01:02.789');
1960-02-11 00:01:03 1960-02-11 00:01:03
{code}
The result must be *1960-02-11 00:01:02 1960-02-11 00:01:02*
The same for the MINUTE level:
{code:sql}
spark-sql> select date_trunc('MINUTE', '1960-02-11 00:01:01'),
date_trunc('MINUTE', '1960-02-11 00:01:50');
1960-02-11 00:02:00 1960-02-11 00:02:00
{code}
The result must be 1960-02-11 00:01:00 1960-02-11 00:01:00
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