code: function ExecuteWriter(queryId, params, consistency) {
    this.queryId = queryId;
    this.params = params || [];
    this.consistency = consistency;
    this.streamId = null;
    if (consistency === null || typeof consistency === 'undefined') {
      this.consistency = types.consistencies.getDefault();
    }
  }
docs: Writes a execute query (given a prepared queryId)