如何在sqlalchemy中根据postgres数组类型长度进行过滤？

from sqlalchemy import create_engine, Column, Integer
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
from sqlalchemy.dialects.postgresql import ARRAY

Base = declarative_base()

class MyTable(Base):
    __tablename__ = 'my_table'
    id = Column(Integer, primary_key=True)
    my_array = Column(ARRAY(Integer))

# 创建数据库连接
engine = create_engine('postgresql://username:password@host:port/database')
Session = sessionmaker(bind=engine)
session = Session()

# 查询长度为3的数组
result = session.query(MyTable).filter(array_length(MyTable.my_array, 1) == 3).all()

# 打印结果
for row in result:
    print(row.id, row.my_array)