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https://issues.apache.org/jira/browse/SPARK-47411?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17830561#comment-17830561
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Milan Dankovic commented on SPARK-47411:
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I am working on this
> StringInstr, FindInSet (all collations)
> ---------------------------------------
>
> Key: SPARK-47411
> URL: https://issues.apache.org/jira/browse/SPARK-47411
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 4.0.0
> Reporter: Uroš Bojanić
> Priority: Major
>
> Enable collation support for the *StringInstr* and *FindInSet* built-in
> string functions in Spark. First confirm what is the expected behaviour for
> these functions when given collated strings, and then move on to
> implementation and testing. One way to go about this is to consider using
> {_}StringSearch{_}, an efficient ICU service for string matching. 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 *StringInstr* and
> *FindInSet* 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, as well as _StringSearch_ using the
> [ICU user
> guide|https://unicode-org.github.io/icu/userguide/collation/string-search.html]
> and [ICU
> docs|https://unicode-org.github.io/icu-docs/apidoc/released/icu4j/com/ibm/icu/text/StringSearch.html].
> Also, refer to the Unicode Technical Standard for string
> [searching|https://www.unicode.org/reports/tr10/#Searching] and
> [collation|https://www.unicode.org/reports/tr35/tr35-collation.html#Collation_Type_Fallback].
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