@org.apache.thrift.annotation.Nullable
  public _Fields fieldForId(int fieldId) {
    return _Fields.findByThriftId(fieldId);
  }
Returns true if field corresponding to fieldID is set (has been assigned a value) and false otherwise
service-rpc/src/gen/thrift/gen-javabean/org/apache/hive/service/rpc/thrift/TGetTablesResp.java