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Query pager needs to handle results that contain partitions with possibly multiple clustering rows quite differently than results with just one row per partition (for example a page may end in a middle of partition). However, the logic dealing with partitions with clustering rows doesn't work correctly for SELECT DISTINCT queries, which are much more similar to the ones for schemas without clustering key. The solution is to set _has_clustering_keys to false in case of SELECT DISTINCT queries regardless of the schema which will make pager correctly expect each partition to return at most one rows. Fixes #1822. Signed-off-by: Paweł Dziepak <pdziepak@scylladb.com> Message-Id: <1478612486-13421-1-git-send-email-pdziepak@scylladb.com>