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https://issues.apache.org/jira/browse/SPARK-47413?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17834800#comment-17834800
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Gideon P commented on SPARK-47413:
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[~uros-db] can you find me an additional ticket to work on, for once I finish
this one?
> Substring, Right, Left (all collations)
> ---------------------------------------
>
> Key: SPARK-47413
> URL: https://issues.apache.org/jira/browse/SPARK-47413
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 4.0.0
> Reporter: Uroš Bojanić
> Priority: Major
> Labels: pull-request-available
>
> Enable collation support for the *Substring* built-in string function in
> Spark (including *Right* and *Left* functions). First confirm what is the
> expected behaviour for these functions when given collated strings, then move
> on to the implementation that would enable handling strings of all collation
> types. Implement the corresponding unit tests
> (CollationStringExpressionsSuite) and E2E tests (CollationSuite) 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 {*}Substring{*},
> {*}Right{*}, and *Left* functions so that they support 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: Contains, StartsWith, EndsWith).
>
> Read more about ICU [Collation Concepts|http://example.com/] and
> [Collator|http://example.com/] class. Also, refer to the Unicode Technical
> Standard for
> [collation|https://www.unicode.org/reports/tr35/tr35-collation.html#Collation_Type_Fallback].
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