robdiciuccio commented on issue #8396: pyarrow does not know how to serialize objects of type URL: https://github.com/apache/incubator-superset/issues/8396#issuecomment-544020796 Thanks for reporting this issue. This may be related to https://github.com/apache/incubator-superset/issues/8225. Are you using Presto by chance? You can disable msgpack and pyarrow serialization by setting `RESULTS_BACKEND_USE_MSGPACK = False` in `superset_config.py` until this issue is resolved.
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