Java Database Connectivity (JDBC)

Description of getDatabaseMetadata()["COLUMN_SIZE"] in Javadoc:
"The COLUMN_SIZE column specifies the column size for the given column.
For character data, this is the ***length in characters***."

Scenario:
- Check that database encoding is multiple bytes per character.
- Create column with the definition VARCHAR2(4 BYTE).
- Try to insert 4 characters each of which is encoded as multiple bytes.
- DBMS correctly generates ORA-12899: value too large for column (actual: 8, maximum: 4)
- Issue: Oracle JDBC driver getDatabaseMetadata()["COLUMN_SIZE"] returns 4, should return 1.

Steps to reproduce:

select * from NLS_DATABASE_PARAMETERS where PARAMETER = 'NLS_CHARACTERSET'; 
-- NLS_LENGTH_SEMANTICS = BYTE 
-- NLS_CHARACTERSET = AL32UTF8 

create table T { 
C VARCHAR2(4 BYTE) 
); 

insert into T(C) values ('1234'); 
-- OK 

insert into T(C) values ('яяяя'); 
-- SQL Error: ORA-12899: value too large for column "T"."C" (actual: 8, maximum: 4) 

Write Java program where you get getDatabaseMetadata()["COLUMN_SIZE"]. 
-- It returns 4, should return 1.