问题描述

今天试着在python3.7.2上安装最新的superset（0.28.1），在初始化数据库的时候报如下错误：

$ superset db upgrade

...

Traceback (most recent call last):

 File "/home/jhadmin/.pyenv/versions/myenv-3.7.2/bin/superset", line 15, in <module>

 cli()

 File "/home/jhadmin/.pyenv/versions/3.7.2/envs/myenv-3.7.2/lib/python3.7/site-packages/click/[core.py](core.py)", line 722, in __call__

 return self.main(*args, **kwargs)

 File "/home/jhadmin/.pyenv/versions/3.7.2/envs/myenv-3.7.2/lib/python3.7/site-packages/flask/[cli.py](cli.py)", line 380, in main

 return AppGroup.main(self, *args, **kwargs)

 File "/home/jhadmin/.pyenv/versions/3.7.2/envs/myenv-3.7.2/lib/python3.7/site-packages/click/[core.py](core.py)", line 697, in main

 rv = self.invoke(ctx)

 File "/home/jhadmin/.pyenv/versions/3.7.2/envs/myenv-3.7.2/lib/python3.7/site-packages/click/[core.py](core.py)", line 1066, in invoke

 return _process_result(sub_ctx.command.invoke(sub_ctx))

 File "/home/jhadmin/.pyenv/versions/3.7.2/envs/myenv-3.7.2/lib/python3.7/site-packages/click/[core.py](core.py)", line 1066, in invoke

 return _process_result(sub_ctx.command.invoke(sub_ctx))

 File "/home/jhadmin/.pyenv/versions/3.7.2/envs/myenv-3.7.2/lib/python3.7/site-packages/click/[core.py](core.py)", line 895, in invoke

 return ctx.invoke(self.callback, **ctx.params)

 File "/home/jhadmin/.pyenv/versions/3.7.2/envs/myenv-3.7.2/lib/python3.7/site-packages/click/[core.py](core.py)", line 535, in invoke
 return callback(*args, **kwargs)

 File "/home/jhadmin/.pyenv/versions/3.7.2/envs/myenv-3.7.2/lib/python3.7/site-packages/click/[decorators.py](decorators.py)", line 17, in new_func

 return f(get_current_context(), *args, **kwargs)

 File "/home/jhadmin/.pyenv/versions/3.7.2/envs/myenv-3.7.2/lib/python3.7/site-packages/flask/[cli.py](cli.py)", line 257, in decorator

 return __ctx.invoke(f, *args, **kwargs)

 File "/home/jhadmin/.pyenv/versions/3.7.2/envs/myenv-3.7.2/lib/python3.7/site-packages/click/[core.py](core.py)", line 535, in invoke

 return callback(*args, **kwargs)

 File "/home/jhadmin/.pyenv/versions/3.7.2/envs/myenv-3.7.2/lib/python3.7/site-packages/flask_migrate/[cli.py](cli.py)", line 134, in upgrade

 _upgrade(directory, revision, sql, tag, x_arg)

 File "/home/jhadmin/.pyenv/versions/3.7.2/envs/myenv-3.7.2/lib/python3.7/site-packages/flask_migrate/__[init__.py](init__.py)", line 95, in wrapped

 f(*args, **kwargs)

 File "/home/jhadmin/.pyenv/versions/3.7.2/envs/myenv-3.7.2/lib/python3.7/site-packages/flask_migrate/__[init__.py](init__.py)", line 280, in upgrade

 command.upgrade(config, revision, sql=sql, tag=tag)

 File "/home/jhadmin/.pyenv/versions/3.7.2/envs/myenv-3.7.2/lib/python3.7/site-packages/alembic/[command.py](command.py)", line 276, in upgrade

 script.run_env()

 File "/home/jhadmin/.pyenv/versions/3.7.2/envs/myenv-3.7.2/lib/python3.7/site-packages/alembic/script/[base.py](base.py)", line 475, in run_env
 util.load_python_file(self.dir, "[env.py](env.py)")

 File "/home/jhadmin/.pyenv/versions/3.7.2/envs/myenv-3.7.2/lib/python3.7/site-packages/alembic/util/[pyfiles.py](pyfiles.py)", line 90, in load_python_file

 module = load_module_py(module_id, path)

 File "/home/jhadmin/.pyenv/versions/3.7.2/envs/myenv-3.7.2/lib/python3.7/site-packages/alembic/util/[compat.py](compat.py)", line 156, in load_module_py

 spec.loader.exec_module(module)

 File "<frozen importlib._bootstrap_external>", line 728, in exec_module

 File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed

 File "/home/jhadmin/.pyenv/versions/3.7.2/envs/myenv-3.7.2/lib/python3.7/site-packages/superset/migrations/[env.py](env.py)", line 100, in <module>

 run_migrations_online()

 File "/home/jhadmin/.pyenv/versions/3.7.2/envs/myenv-3.7.2/lib/python3.7/site-packages/superset/migrations/[env.py](env.py)", line 93, in run_migrations_online

 context.run_migrations()

 File "<string>", line 8, in run_migrations

 File "/home/jhadmin/.pyenv/versions/3.7.2/envs/myenv-3.7.2/lib/python3.7/site-packages/alembic/runtime/[environment.py](environment.py)", line 839, in run_migrations

 self.get_context().run_migrations(**kw)

 File "/home/jhadmin/.pyenv/versions/3.7.2/envs/myenv-3.7.2/lib/python3.7/site-packages/alembic/runtime/[migration.py](migration.py)", line 361, in run_migrations

 step.migration_fn(**kw)

 File "/home/jhadmin/.pyenv/versions/3.7.2/envs/myenv-3.7.2/lib/python3.7/site-packages/superset/migrations/versions/[4451805bbaa1_remove_double_percents.py](4451805bbaa1_remove_double_percents.py)", line 82, in upgrade

 replace('%%', '%')

 File "/home/jhadmin/.pyenv/versions/3.7.2/envs/myenv-3.7.2/lib/python3.7/site-packages/superset/migrations/versions/[4451805bbaa1_remove_double_percents.py](4451805bbaa1_remove_double_percents.py)", line 53, in replace

 .join(Table)
 File "/home/jhadmin/.pyenv/versions/3.7.2/envs/myenv-3.7.2/lib/python3.7/site-packages/sqlalchemy/orm/[query.py](query.py)", line 2235, in join

 from_joinpoint=from_joinpoint,

 File "<string>", line 2, in _join

 File "/home/jhadmin/.pyenv/versions/3.7.2/envs/myenv-3.7.2/lib/python3.7/site-packages/sqlalchemy/orm/[base.py](base.py)", line 220, in generate

 fn(self, *args[1:], **kw)

 File "/home/jhadmin/.pyenv/versions/3.7.2/envs/myenv-3.7.2/lib/python3.7/site-packages/sqlalchemy/orm/[query.py](query.py)", line 2414, in _join

 left, right, onclause, prop, create_aliases, outerjoin, full

 File "/home/jhadmin/.pyenv/versions/3.7.2/envs/myenv-3.7.2/lib/python3.7/site-packages/sqlalchemy/orm/[query.py](query.py)", line 2437, in _join_left_to_right

 ) = self._join_determine_implicit_left_side(left, right, onclause)

 File "/home/jhadmin/.pyenv/versions/3.7.2/envs/myenv-3.7.2/lib/python3.7/site-packages/sqlalchemy/orm/[query.py](query.py)", line 2568, in _join_determine_implicit_left_side

 "Can't determine which FROM clause to join "

sqlalchemy.exc.InvalidRequestError: Can't determine which FROM clause to join from, there are multiple FROMS which can join to this entity. Try adding an explicit ON clause to help resolve the ambiguity.

问题原因

这是 SQLAlchemy 库版本太高导致的，需要安装低版本的 SQLAlchemy 库。

解决办法

# 查看当前 SQLAlchemy 版本
$ pip list | grep -i sqlalchemy
Flask-SQLAlchemy 2.3.2   
SQLAlchemy       1.3.2   
SQLAlchemy-Utils 0.33.11

# 安装低版本 SQLAlchemy
$ pip install SQLAlchemy==1.2.18

然后重新运行 “superset db upgrade” 命令初始化数据库。