Kent Yao created SPARK-31892:
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Summary: Disable week-base date filed for parsing
Key: SPARK-31892
URL: https://issues.apache.org/jira/browse/SPARK-31892
Project: Spark
Issue Type: Sub-task
Components: SQL
Affects Versions: 3.0.0, 3.1.0
Reporter: Kent Yao
It's an un-fixable behavior change to fill the gap between SimpleDateFormat and
DateTimeFormater and backward-compatibility for different JDKs.
A lot of effort has been made to prove this at
https://github.com/apache/spark/pull/28674
The existing behavior itself in 2.4 is confusing, e.g.
{code:sql}
spark-sql> select to_timestamp('1', 'w');
1969-12-28 00:00:00
spark-sql> select to_timestamp('1', 'u');
1970-01-05 00:00:00
{code}
the 'u' here seems not to go to the Monday of the first week in week-based form
or the first day of the year in non-week-based form but go to the Monday of the
second week in week-based form.
{code:sql}
spark-sql> select to_timestamp('2020 2020', 'YYYY yyyy');
2020-01-01 00:00:00
spark-sql> select to_timestamp('2020 2020', 'yyyy YYYY');
2019-12-29 00:00:00
spark-sql> select to_timestamp('2020 2020 1', 'YYYY yyyy w');
NULL
spark-sql> select to_timestamp('2020 2020 1', 'yyyy YYYY w');
2019-12-29 00:00:00
{code}
I think we don't need to introduce all the weird behavior from Java.
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