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https://issues.apache.org/jira/browse/SPARK-47567?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot reassigned SPARK-47567:
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Assignee: (was: Apache Spark)
> StringLocate
> ------------
>
> Key: SPARK-47567
> URL: https://issues.apache.org/jira/browse/SPARK-47567
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 4.0.0
> Reporter: Milan Dankovic
> Priority: Major
> Labels: pull-request-available
>
> Enable collation support for the *StringLocate* built-in string function 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 *StringLocate* 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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