ArnavBalyan opened a new pull request, #9328:
URL: https://github.com/apache/paimon/pull/9328

   ### Purpose
    - Substring operations use UTF-16 indexes, which count certain unicode 
characters as two positions.
    - This splits 2 character positions incorrectly (such as emojis) and return 
an invalid result.
    - Fix this by counting and extracting complete unicode characters.
   
   ### Tests
    - UT
   


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