jakromm commented on issue #4297: [Filter Box] Boolean values show up blank in selector URL: https://github.com/apache/incubator-superset/issues/4297#issuecomment-374390816 I'm sure the root cause on this is different, but since you are addressing this code area it might be an easy fix. When exploring a slice and "Enable Filter Select" is enabled, the NULL case in the drop down also shows up as Empty like is shown above. There also doesn't seem to be a way to filter for IS NULL, if you try to use the 'in' predicate it creates an empty set and simply does 1 != 1 (or however you have empty_in_strategy configured for the connection).
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