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c0ea98f922
Introduce a read_type enum (linearizable vs non_linearizable) and transform the existing "validate" function into a "parse" method - instead of checking if the consistency level is one of the accepted ones, we now also return the correcponding read type for strong consistency. The "parse" function maps CQL consistency levels to following read types: - CL=(LOCAL_)QUORUM -> linearizable (this is the default CL) - CL=(LOCAL_)ONE -> non_linearizable - all others -> throw The classification is performed in the CQL layer (select_statement) to keep the coordinator free of CL concepts.