yevgenypats commented on issue #34292:
URL: https://github.com/apache/arrow/issues/34292#issuecomment-1448398018

   Seems like it's a deeper rabbit hole here for custom json 
marshaling/unmarshaling for extensions. 
   
   For example here - 
https://github.com/apache/arrow/blob/main/go/arrow/array/extension.go#L228
   
   The extension 
[builder](https://github.com/apache/arrow/blob/main/go/arrow/array/extension.go#L228)
 is always calling the underlying storage builder which means we can't really 
control `unmarshal` for extensions.
   
   Don't have a good idea on top of my head but seems like the extension 
abstraction might need a bit of more work or maybe we need a storage extension?


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