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https://issues.apache.org/jira/browse/SPARK-48157?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Uroš Bojanić updated SPARK-48157:
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Component/s: SQL
(was: Spark Core)
> CSV expressions (all collations)
> --------------------------------
>
> Key: SPARK-48157
> URL: https://issues.apache.org/jira/browse/SPARK-48157
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 4.0.0
> Reporter: Uroš Bojanić
> Priority: Major
>
> Enable collation support for *CSV* built-in string functions in Spark
> ({*}CsvToStructs{*}, {*}SchemaOfCsv{*}, {*}StructsToCsv{*}). First confirm
> what is the expected behaviour for these functions when given collated
> strings, and then move on to implementation and testing. You will find these
> expressions in the *csvExpressions.scala* file, and they should mostly be
> pass-through functions. 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 *CSV* expressions 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: 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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