gstvg opened a new issue, #11081:
URL: https://github.com/apache/datafusion/issues/11081

   ### Is your feature request related to a problem or challenge?
   
   Retrieve the value of the given union variant, or `NULL` if it's not 
currently selected
   
   ### Describe the solution you'd like
   
   _No response_
   
   ### Describe alternatives you've considered
   
   _No response_
   
   ### Additional context
   
   DuckDB has such function, I propose using the same name
   
[https://duckdb.org/docs/sql/functions/nested.html#union_extractunion-tag](https://duckdb.org/docs/sql/functions/nested.html#union_extractunion-tag)


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