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* Combine InDimFilter, InFilter. There are two motivations: 1. Ensure that when HashJoinSegmentStorageAdapter compares its Filter to the original one, and it is an "in" type, the comparison is by reference and does not need to check deep equality. This is useful when the "in" filter is very large. 2. Simplify things. (There isn't a great reason for the DimFilter and Filter logic to be separate, and combining them reduces some duplication.) * Fix test.