Peter Toth created SPARK-27882:
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Summary: Support SQL:2016 compatible datetime patterns
Key: SPARK-27882
URL: https://issues.apache.org/jira/browse/SPARK-27882
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 3.0.0
Reporter: Peter Toth
Date and time related functions in Spark use
[DateTimeFormatter|https://docs.oracle.com/javase/8/docs/api/java/time/format/DateTimeFormatter.html]
to parse and format dates. Unfortunately, it is not entirely compatible with
the SQL:2016 standard.
There is an initiative in Impala: IMPALA-4018 and Hive HIVE-21575 to support
SQL:2016 patterns as both these systems lack this feature currently.
The [Impala design
document|https://docs.google.com/document/d/1V7k6-lrPGW7_uhqM-FhKl3QsxwCRy69v2KIxPsGjc1k/edit]
and [compatibility
matrix|https://docs.google.com/spreadsheets/d/1lD4EcVaTp-qtm0JYPTPfhqYrwwNl0qJHHYP8dICS9EY/edit#gid=0]
created by [~gaborkaszab] covers how the compliance with the standard can be
achieved and how do other databases support this standard. I believe these
documents are very useful for Spark community as well.
Since Hive is also JVM based I also see an option to share some code that does
the parsing/formatting according to the standard.
(Please note that format patterns are just one part of these tickets, the other
part about `CAST (... FORMAT <pattern>)` function, which is also part of the
SQL:2016 standard, is covered here: SPARK-27881)
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