Github user kaspersorensen commented on the issue:
https://github.com/apache/metamodel/pull/139
Alternatively we should deprecate DIFFERENT_FROM and not introduce NOT_IN.
That would technically speaking be fine. But my last argument is that from an
evolution perspective, it would be worse, because it forces a lot of existing
implementations to evaluate a new attribute which was not there before. It
would implicitly introduce a ton of bugs because data contexts out there would
no longer execute queries correctly.
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