使用Cubes库钻取Cube时抛出AttributeError错误求助

我在使用Cubes官方教程代码时遇到问题，具体报错信息：

AttributeError: 'Subquery' object has no attribute 'count'

报错触发代码行：
result = browser.aggregate(cell, drilldown={"item":"subcategory", "year":None})

环境配置 #

• SQLAlchemy版本1.4.4
• Python 3.9
• Cubes v1.1

完整代码 #

engine = create_engine('sqlite:///data.sqlite')
create_table_from_csv(engine,
                         "../data/data.csv",
                         table_name="irbd_balance",
                         fields=[
                            ("category", "string"),
                            ("category_label", "string"),
                             ("subcategory", "string"),
                              ("subcategory_label", "string"),
                              ("line_item", "string"),
                             ("year", "integer"),
                             ("amount", "integer")],
                        create_id=True
                  )
print("done. file data.sqlite created")
workspace = Workspace()
workspace.register_default_store("sql", url="sqlite:///data.sqlite")
workspace.import_model("../model.json")
cube = workspace.cube("irbd_balance")
full_cube = Cell(cube)
result = browser.aggregate(full_cube, drilldown=["item"])#error here throwing: AttributeError: 'Subquery' object has no attribute 'count'

for record in result.drilldown:
   print(record)

完整堆栈跟踪信息 #

Traceback (most recent call last):
  File "C:\Users\path\tests\test_cube.py", line 60, in <module>
    result = browser.aggregate(cell, drilldown=["item"])
  File "C:\Users\path\venv\lib\site-packages\cubes\browser.py", line 145, in aggregate
    result = self.provide_aggregate(cell,
  File "C:\Users\path\venv\lib\site-packages\cubes\sql\browser.py", line 437, in provide_aggregate
    count_statement = statement.alias().count()
AttributeError: 'Subquery' object has no attribute 'count'

内容的提问来源于stack exchange，提问作者marc nicole