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https://issues.apache.org/jira/browse/SPARK-47358?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17828917#comment-17828917
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Milan Dankovic commented on SPARK-47358:
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I am working on this.
> StringRepeat (all collations)
> -----------------------------
>
> Key: SPARK-47358
> URL: https://issues.apache.org/jira/browse/SPARK-47358
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 4.0.0
> Reporter: Uroš Bojanić
> Priority: Major
>
> Enable collation support for the *StringRepeat* built-in string function in
> Spark. 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 *StringRepeat* function so
> 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: 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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