We would like to use the new driver feature "speculative query execution" for some of our queries (http://datastax.github.io/java-driver/2.1.7/features/speculative_execution/). Unfortunately we found no way to execute our Accessor queries with the setIdempotent=true flag.
It would be great if you could add support for setIdempotent() in Accessor queries. Probably via the QueryParameter annotation.
Added @QueryParameters(idempotent=true) as you suggested. If not set, the default will be taken from QueryOptions.
In addition, we made all the queries generated by Mapper idempotent.