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Query result digest is used to verify that all replicas have the same data. Therefore, it needs to contain more information than the query result itself in order to ensure proper detection of disagreements. Generally, adding clustering keys to the digest regardless of whether the client asked for them will guarantee correctness. However, adding tombstones as well improves the chances of early detection of nodes containing stale data. Signed-off-by: Paweł Dziepak <pdziepak@scylladb.com>