Joris Van den Bossche created ARROW-7858:

             Summary: [C++][Python] Support casting an Extension type to its 
storage type
                 Key: ARROW-7858
             Project: Apache Arrow
          Issue Type: Test
          Components: C++, Python
            Reporter: Joris Van den Bossche

Currently, casting an extension type will always fail: "No cast implemented 
from extension<arrow.py_extension_type> to ...".

However, for casting, we could fall back to the storage array's casting rules?

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