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a4275cf8bc
The main difficulty was in making sure that emitted range tombstone changes reflect range tombstones trimmed to clustering restrictions. This is handled by mutation_fragment_filter and clustering_ranges_walker. They return a list of range_tombstone_change fragments to emit for each hop as the reader walks over the clustering domain. Tests which were using a normalizing reader expected range tombstones to be split around rows. Drop this an adjust the tests accoridngly. No reader splits range tombstones around rows now.