SQLAlchemy和Oracle-如何让VARCHAR2列使用BYTE而不是CHAR?

VARCHAR2 列作为 CHAR .我如何使用创建它 BYTE

from sqlalchemy import MetaData, Column, String
from sqlalchemy.ext.declarative import declarative_base

metadata = MetaData()
Base = declarative_base(metadata=metadata)

class Foo(Base):
    __tablename__ = 'foo'
    name = Column(String(10), primary_key=True)

Foo.__table__.create(bind=engine)

CREATE TABLE XXMD.FOO
(
  NAME  VARCHAR2(10 CHAR)                       NOT NULL
)

相反,我希望它创建以下内容:

CREATE TABLE XXMD.FOO
(
  NAME  VARCHAR2(10 BYTE)                       NOT NULL
)