presto-cassandra/src/main/java/io/prestosql/plugin/cassandra/CassandraClientConfig.java/CassandraClientConfig/setProtocolVersion
class CassandraClientConfig:    @Config("cassandra.protocol-version")
    public CassandraClientConfig setProtocolVersion(ProtocolVersion version)
    {
        this.protocolVersion = version;
        return this;
    }