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https://issues.apache.org/jira/browse/SPARK-49204?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-49204.
---------------------------------
Fix Version/s: 4.0.0
Resolution: Fixed
Issue resolved by pull request 47713
[https://github.com/apache/spark/pull/47713]
> Handle surrogate pairs properly
> -------------------------------
>
> Key: SPARK-49204
> URL: https://issues.apache.org/jira/browse/SPARK-49204
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 4.0.0
> Reporter: Uroš Bojanić
> Assignee: Uroš Bojanić
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0
>
>
> Fix the following string expressions to handle one-to-many case mapping
> properly:
> * StringReplace
> * StringInstr
> * StringLocate
> * SubstringIndex
> * StringTrim
> * StringTrimLeft
> * StringTrimRight
>
> Examples of incorrect results (under {{ICU}} collations):
> {code:java}
> StringReplace("😄a", "a", "b") // returns: "😄ab" (incorrect), instead of: "😄b"
> (correct){code}
>
> {code:java}
> StringInstr("😄a", "a") // returns: 3 (incorrect), instead of: 2
> (correct){code}
>
> {code:java}
> StringLocate("a", "😄a") // returns: 3 (incorrect), instead of: 2
> (correct){code}
>
> {code:java}
> SubstringIndex("😄a", "a") // returns: "😄a" (incorrect), instead of: "😄"
> (correct){code}
>
> {code:java}
> StringTrim("😄", "😄") // returns: "😄" (incorrect), instead of: ""
> (correct){code}
>
> {code:java}
> StringTrimLeft("😄", "😄") // returns: "😄" (incorrect), instead of: ""
> (correct){code}
>
> {code:java}
> StringTrimRight("😄", "😄") // returns: "😄" (incorrect), instead of: ""
> (correct){code}
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