code: public <K, C> ColumnFamilyQuery<K, C> prepareQuery(ColumnFamily<K, C> cf, ConsistencyLevel consistency) {
          return _astyanaxKeyspace.prepareQuery(cf).setConsistencyLevel(clamp(consistency));
      }
docs: Starting point for constructing a query. From the column family the
  client can perform all 4 types of queries: get column, get key slice, get
  key range and and index query.