pitrou commented on issue #29309:
URL: https://github.com/apache/arrow/issues/29309#issuecomment-4798656017

   I agree with @shreyans800755 here:
   
   > I tried to work on this, but I think current implementation might be 
intentional
   
   If you want to build an extension array, you should first build the storage 
array and then wrap it explicitly with the extension type.
   
   This issue is basically asking for all Builder classes to handle extension 
types, which is going to add a lot of logic for little benefit.


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