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Values of the v3 unknown type are always null. Binding IS NULL on an unknown column now returns AlwaysTrue and NOT NULL returns AlwaysFalse.
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BoundUnaryPredicate, and since unknown columns have no metrics,NOT NULLcould not prune any data files.unknowntype are always null, soIS NULLon an unknown column now binds toAlwaysTrueandNOT NULLbinds toAlwaysFalse.TODO(gangwu): deal with UnknownTypeinBindUnaryOperationand matches Java'sUnboundPredicate#bindUnaryOperation.