Est-il possible d'obtenir la longueur maximale possible d'une variable

Je me demandais si une fonction donnant la longueur maximale d'une variable existe dans PLSQL.

Par exemple, si je déclare P>

create or replace 
TYPE ENREG_320_03 UNDER ENREG_320_BASE(
date_creation VARCHAR2(8),
raison_sociale_emetteur VARCHAR2(35),
adresse_emetteur_1 VARCHAR2(35),
adresse_emetteur_2 VARCHAR2(35),
adresse_emetteur_3 VARCHAR2(35),
num_siret VARCHAR2(14),
ref_remise VARCHAR2(16),
code_bic_emetteur VARCHAR2(11),
type_ident_compte_debit VARCHAR2(1),
ident_compte_debit VARCHAR2(34),
code_devise_compte_debit VARCHAR2(3),
ident_client VARCHAR2(16),
type_ident_compte_frais VARCHAR2(1),
ident_compte_frais VARCHAR2(34),
code_devise_compte_frais VARCHAR2(3),
zone_reserve VARCHAR2(16),
indice_type_debit_remise VARCHAR2(1),
indice_type_remise  VARCHAR2(1),
date_execution_souhait VARCHAR2(8),
devise_transfert VARCHAR2(3),

MEMBER FUNCTION get_date_creation RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.date_creation IS NULL THEN lpad(' ', 8, ' ') ELSE   rpad(SELF.date_creation, 8, ' ') END;
END get_date_creation;

MEMBER FUNCTION get_raison_sociale_emetteur RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.raison_sociale_emetteur IS NULL THEN lpad(' ', 35, ' ') ELSE rpad(SELF.raison_sociale_emetteur, 35, ' ') END;
END get_raison_sociale_emetteur;

MEMBER FUNCTION get_adresse_emetteur_1 RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.adresse_emetteur_1 IS NULL THEN lpad(' ', 35, ' ') ELSE rpad(SELF.adresse_emetteur_1, 35, ' ') END;
END get_adresse_emetteur_1;

MEMBER FUNCTION get_adresse_emetteur_2 RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.adresse_emetteur_2 IS NULL THEN lpad(' ', 35, ' ') ELSE rpad(SELF.adresse_emetteur_2, 35, ' ') END;
END get_adresse_emetteur_2;

MEMBER FUNCTION get_adresse_emetteur_3 RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.adresse_emetteur_3 IS NULL THEN lpad(' ', 35, ' ') ELSE rpad(SELF.adresse_emetteur_3, 35, ' ') END;
END get_adresse_emetteur_3;

MEMBER FUNCTION get_num_siret RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.num_siret IS NULL THEN lpad(' ', 14, ' ') ELSE rpad(SELF.num_siret, 14, ' ') END;
END get_num_siret;

MEMBER FUNCTION get_ref_remise RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.ref_remise IS NULL THEN lpad(' ', 16, ' ') ELSE rpad(SELF.ref_remise, 16, ' ') END;
END get_ref_remise;

MEMBER FUNCTION get_code_bic_emetteur RETURN VARCHAR2 AS
BEGIN
   RETURN CASE WHEN SELF.code_bic_emetteur IS NULL THEN lpad(' ', 11, ' ') ELSE rpad(SELF.code_bic_emetteur, 11, ' ') END;
END get_code_bic_emetteur;

MEMBER FUNCTION get_type_ident_compte_debit RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.type_ident_compte_debit IS NULL THEN lpad(' ', 1, ' ') ELSE rpad(SELF.type_ident_compte_debit, 1, ' ') END;
END get_type_ident_compte_debit;

MEMBER FUNCTION get_ident_compte_debit RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.ident_compte_debit IS NULL THEN lpad(' ', 34, ' ') ELSE rpad(SELF.ident_compte_debit, 34, ' ') END;
END get_ident_compte_debit;

MEMBER FUNCTION get_code_devise_compte_debit RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.code_devise_compte_debit IS NULL THEN lpad(' ', 3, ' ') ELSE rpad(SELF.code_devise_compte_debit, 3, ' ') END;
END get_code_devise_compte_debit;

MEMBER FUNCTION get_ident_client RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.ident_client IS NULL THEN lpad(' ', 16, ' ') ELSE rpad(SELF.ident_client, 16, ' ') END;
END get_ident_client;

MEMBER FUNCTION get_type_ident_compte_frais RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.type_ident_compte_frais IS NULL THEN lpad(' ', 1, ' ') ELSE rpad(SELF.type_ident_compte_frais, 1, ' ') END;
END get_type_ident_compte_frais;

MEMBER FUNCTION get_ident_compte_frais RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.ident_compte_frais IS NULL THEN lpad(' ', 34, ' ') ELSE rpad(SELF.ident_compte_frais, 34, ' ') END;
END get_ident_compte_frais;

MEMBER FUNCTION get_code_devise_compte_frais RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.code_devise_compte_frais IS NULL THEN lpad(' ', 3, ' ') ELSE rpad(SELF.code_devise_compte_frais, 3, ' ') END;
END get_code_devise_compte_frais;

MEMBER FUNCTION get_zone_reserve RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.zone_reserve IS NULL THEN lpad(' ', 16, ' ') ELSE rpad(SELF.zone_reserve, 16, ' ') END;
END get_zone_reserve;

MEMBER FUNCTION get_indice_type_debit_remise RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.indice_type_debit_remise IS NULL THEN lpad(' ', 1, ' ') ELSE rpad(SELF.indice_type_debit_remise, 1, ' ') END;
END get_indice_type_debit_remise;

MEMBER FUNCTION get_indice_type_remise RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.indice_type_remise IS NULL THEN lpad(' ', 1, ' ') ELSE rpad(SELF.indice_type_remise, 1, ' ') END;
END get_indice_type_remise;

MEMBER FUNCTION get_date_execution_souhait RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.date_execution_souhait IS NULL THEN lpad(' ', 8, ' ') ELSE rpad(SELF.date_execution_souhait, 8, ' ') END;
END get_date_execution_souhait;

MEMBER FUNCTION get_devise_transfert RETURN VARCHAR2 AS
BEGIN
  RETURN CASE WHEN SELF.devise_transfert IS NULL THEN lpad(' ', 3, ' ') ELSE rpad(SELF.devise_transfert, 3, ' ') END;
END get_devise_transfert;