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https://issues.apache.org/jira/browse/SPARK-48215?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-48215.
---------------------------------
Fix Version/s: 4.0.0
Resolution: Fixed
Issue resolved by pull request 46561
[https://github.com/apache/spark/pull/46561]
> DateFormatClass (all collations)
> --------------------------------
>
> Key: SPARK-48215
> URL: https://issues.apache.org/jira/browse/SPARK-48215
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 4.0.0
> Reporter: Uroš Bojanić
> Assignee: Nebojsa Savic
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0
>
>
> Enable collation support for the *DateFormatClass* built-in function in
> Spark. First confirm what is the expected behaviour for this expression when
> given collated strings, and then move on to implementation and testing. You
> will find this expression in the *datetimeExpressions.scala* file, and it
> should be considered a pass-through function with respect to collation
> awareness. Implement the corresponding E2E SQL tests
> (CollationSQLExpressionsSuite) to reflect how this function should be used
> with collation in SparkSQL, and feel free to use your chosen Spark SQL Editor
> to experiment with the existing functions to learn more about how they work.
> In addition, look into the possible use-cases and implementation of similar
> functions within other other open-source DBMS, such as
> [PostgreSQL|https://www.postgresql.org/docs/].
>
> The goal for this Jira ticket is to implement the *DateFormatClass*
> expression so that it supports all collation types currently supported in
> Spark. To understand what changes were introduced in order to enable full
> collation support for other existing functions in Spark, take a look at the
> Spark PRs and Jira tickets for completed tasks in this parent (for example:
> Ascii, Chr, Base64, UnBase64, Decode, StringDecode, Encode, ToBinary,
> FormatNumber, Sentences).
>
> Read more about ICU [Collation Concepts|http://example.com/] and
> [Collator|http://example.com/] class. Also, refer to the Unicode Technical
> Standard for string
> [collation|https://www.unicode.org/reports/tr35/tr35-collation.html#Collation_Type_Fallback].
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