如何在SQL Alchemy中仅将Python表达式用作混合属性

from sqlalchemy.ext.hybrid import hybrid_property
from sqlalchemy import Column, Integer, String

class User(Base):
    __tablename__ = 'users'
    id = Column(Integer, primary_key=True)
    first_name = Column(String)
    last_name = Column(String)

class User(Base):
    __tablename__ = 'users'
    id = Column(Integer, primary_key=True)
    first_name = Column(String)
    last_name = Column(String)

    @hybrid_property
    def full_name(self):
        return self.first_name + ' ' + self.last_name

from sqlalchemy import select

class User(Base):
    __tablename__ = 'users'
    id = Column(Integer, primary_key=True)
    first_name = Column(String)
    last_name = Column(String)

    @hybrid_property
    def full_name(self):
        return self.first_name + ' ' + self.last_name

    @full_name.expression
    def full_name(cls):
        return select([cls.first_name + ' ' + cls.last_name])

user = User(first_name='John', last_name='Doe')
print(user.full_name)  # 输出：John Doe

users = session.query(User).filter(User.full_name == 'John Doe').all()