@org.apache.thrift.annotation.Nullable
      public static _Fields findByThriftId(int fieldId) {
        switch(fieldId) {
          case 1: // EXPRESSION
            return EXPRESSION;
          case 2: // DO_TRUNC
            return DO_TRUNC;
          default:
            return null;
        }
      }
@org.apache.thrift.annotation.Nullable
      public static _Fields findByThriftId(int fieldId)