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seletinload track on is using variable length for columns

See original GitHub issue

Hello,

After update sqlalchemy from version 1.3+ to version 1.4+ and running my tests I am getting randomly this error:

___________________ TestEventRegistration.test_company_data ____________________
[gw4] linux -- Python 3.8.0 /usr/local/bin/python

self = <src.coma.tests.social_api.test_custom_event_registration.TestEventRegistration object at 0x7fa09ad63eb0>
create_event = <function create_event.<locals>._create_event at 0x7fa098feab80>
create_user = <function create_user.<locals>._create_user at 0x7fa0a2bc35e0>
user_to_admin = <function user_to_admin.<locals>._user_to_admin at 0x7fa09a02bc10>
user_to_operator = <function user_to_operator.<locals>._user_to_operator at 0x7fa09948c1f0>
testapp = <webtest.app.TestApp object at 0x7fa0a78ed1c0>
get_form_nodes = <function get_form_nodes.<locals>._get_form_nodes at 0x7fa09948c160>
create_form_node = <function create_form_node.<locals>._create_form_node at 0x7fa09948c040>
prepare_valid_form_result = <function prepare_valid_form_result.<locals>.wrapped at 0x7fa09948c310>

    def test_company_data(
            self, create_event, create_user, user_to_admin, user_to_operator,
            testapp, get_form_nodes, create_form_node, prepare_valid_form_result):
        """ Create company data node """
        operator = create_user().json['user']
        user_to_admin(operator['id'])
        event = create_event({"custom_registration": True}).json
        event_id = event['id']

        # add node
        defined_company_data = {
            'defined_type': 'company-data',
            'required': True,
        }
>       response = create_form_node(event_id, 'registration', defined_company_data)

src/coma/tests/social_api/test_custom_event_registration.py:428:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
src/coma/tests/fixtures/forms.py:90: in _create_form_node
    return testapp.post_json(
/usr/local/lib/python3.8/site-packages/webtest/utils.py:36: in wrapper
    return self._gen_request(method, url, **kw)
/usr/local/lib/python3.8/site-packages/webtest/app.py:752: in _gen_request
    return self.do_request(req, status=status,
/usr/local/lib/python3.8/site-packages/webtest/app.py:623: in do_request
    res = req.get_response(app, catch_exc_info=True)
/usr/local/lib/python3.8/site-packages/webob/request.py:1309: in send
    status, headers, app_iter, exc_info = self.call_application(
/usr/local/lib/python3.8/site-packages/webob/request.py:1278: in call_application
    app_iter = application(self.environ, start_response)
/usr/local/lib/python3.8/site-packages/webtest/lint.py:201: in lint_app
    iterator = application(environ, start_response_wrapper)
/usr/local/lib/python3.8/site-packages/sentry_sdk/integrations/pyramid.py:131: in sentry_patched_wsgi_call
    return SentryWsgiMiddleware(sentry_patched_inner_wsgi_call)(
/usr/local/lib/python3.8/site-packages/sentry_sdk/integrations/wsgi.py:140: in __call__
    reraise(*_capture_exception(hub))
/usr/local/lib/python3.8/site-packages/sentry_sdk/_compat.py:54: in reraise
    raise value
/usr/local/lib/python3.8/site-packages/sentry_sdk/integrations/wsgi.py:133: in __call__
    rv = self.app(
/usr/local/lib/python3.8/site-packages/sentry_sdk/integrations/pyramid.py:129: in sentry_patched_inner_wsgi_call
    reraise(*einfo)
/usr/local/lib/python3.8/site-packages/sentry_sdk/_compat.py:54: in reraise
    raise value
/usr/local/lib/python3.8/site-packages/sentry_sdk/integrations/pyramid.py:125: in sentry_patched_inner_wsgi_call
    return old_wsgi_call(self, environ, start_response)
/usr/local/lib/python3.8/site-packages/pyramid/router.py:270: in __call__
    response = self.execution_policy(environ, self)
/usr/local/lib/python3.8/site-packages/pyramid/router.py:276: in default_execution_policy
    return router.invoke_request(request)
/usr/local/lib/python3.8/site-packages/pyramid/router.py:245: in invoke_request
    response = handle_request(request)
src/coma/tweens.py:29: in invalid_path_tween
    return handler(request)
src/coma/tweens.py:8: in conditional_http_tween
    response = handler(request)
/usr/local/lib/python3.8/site-packages/pyramid_tm/__init__.py:178: in tm_tween
    reraise(*exc_info)
/usr/local/lib/python3.8/site-packages/pyramid_tm/compat.py:36: in reraise
    raise value
/usr/local/lib/python3.8/site-packages/pyramid_tm/__init__.py:143: in tm_tween
    response = handler(request)
/usr/local/lib/python3.8/site-packages/pyramid/tweens.py:43: in excview_tween
    response = _error_handler(request, exc)
/usr/local/lib/python3.8/site-packages/pyramid/tweens.py:13: in _error_handler
    response = request.invoke_exception_view(exc_info)
/usr/local/lib/python3.8/site-packages/sentry_sdk/integrations/pyramid.py:99: in sentry_patched_invoke_exception_view
    rv = old_invoke_exception_view(self, *args, **kwargs)
/usr/local/lib/python3.8/site-packages/pyramid/view.py:765: in invoke_exception_view
    response = _call_view(
/usr/local/lib/python3.8/site-packages/pyramid/view.py:674: in _call_view
    response = view_callable(context, request)
/usr/local/lib/python3.8/site-packages/pyramid/viewderivers.py:392: in viewresult_to_response
    result = view(context, request)
/usr/local/lib/python3.8/site-packages/pyramid/tweens.py:41: in excview_tween
    response = handler(request)
src/coma/tweens.py:40: in invalid_json_tween
    return handler(request)
/usr/local/lib/python3.8/site-packages/pyramid/router.py:143: in handle_request
    response = _call_view(
/usr/local/lib/python3.8/site-packages/sentry_sdk/integrations/pyramid.py:90: in sentry_patched_call_view
    return old_call_view(registry, request, *args, **kwargs)
/usr/local/lib/python3.8/site-packages/pyramid/view.py:674: in _call_view
    response = view_callable(context, request)
/usr/local/lib/python3.8/site-packages/pyramid/config/views.py:151: in __call__
    return view(context, request)
/usr/local/lib/python3.8/site-packages/pyramid/config/views.py:170: in attr_view
    return view(context, request)
/usr/local/lib/python3.8/site-packages/pyramid/config/views.py:196: in predicate_wrapper
    return view(context, request)
/usr/local/lib/python3.8/site-packages/pyramid/viewderivers.py:319: in secured_view
    return view(context, request)
/usr/local/lib/python3.8/site-packages/pyramid/viewderivers.py:427: in rendered_view
    result = view(context, request)
/usr/local/lib/python3.8/site-packages/pyramid/viewderivers.py:141: in _requestonly_view
    response = view(request)
/usr/local/lib/python3.8/site-packages/cornice/service.py:590: in wrapper
    response = view_()
src/coma/webapi/event_forms.py:446: in collection_post
    item = self.service.create_node(form, self.request.validated, form_type=form_type)
src/coma/services/forms.py:105: in create_node
    self.__update_required(node, required=data.get('required', False))
src/coma/services/forms.py:223: in __update_required
    for n in node.nodes:
/usr/local/lib/python3.8/site-packages/sqlalchemy/orm/attributes.py:480: in __get__
    return self.impl.get(state, dict_)
/usr/local/lib/python3.8/site-packages/sqlalchemy/orm/attributes.py:927: in get
    value = self.callable_(state, passive)
/usr/local/lib/python3.8/site-packages/sqlalchemy/orm/strategies.py:878: in _load_for_state
    return self._emit_lazyload(
/usr/local/lib/python3.8/site-packages/sqlalchemy/orm/strategies.py:1045: in _emit_lazyload
    result = result.unique().scalars().all()
/usr/local/lib/python3.8/site-packages/sqlalchemy/engine/result.py:1320: in all
    return self._allrows()
/usr/local/lib/python3.8/site-packages/sqlalchemy/engine/result.py:400: in _allrows
    rows = self._fetchall_impl()
/usr/local/lib/python3.8/site-packages/sqlalchemy/engine/result.py:1233: in _fetchall_impl
    return self._real_result._fetchall_impl()
/usr/local/lib/python3.8/site-packages/sqlalchemy/engine/result.py:1620: in _fetchall_impl
    return list(self.iterator)
/usr/local/lib/python3.8/site-packages/sqlalchemy/orm/loading.py:131: in chunks
    post_load.invoke(context, path)
/usr/local/lib/python3.8/site-packages/sqlalchemy/orm/loading.py:1309: in invoke
    loader(context, path, states, self.load_keys, *arg, **kw)
/usr/local/lib/python3.8/site-packages/sqlalchemy/orm/strategies.py:2854: in _load_for_path
    q = sql.lambda_stmt(
/usr/local/lib/python3.8/site-packages/sqlalchemy/sql/lambdas.py:101: in lambda_stmt
    return StatementLambdaElement(
/usr/local/lib/python3.8/site-packages/sqlalchemy/sql/lambdas.py:161: in __init__
    rec = self._retrieve_tracker_rec(fn, apply_propagate_attrs, opts)
/usr/local/lib/python3.8/site-packages/sqlalchemy/sql/lambdas.py:187: in _retrieve_tracker_rec
    [
/usr/local/lib/python3.8/site-packages/sqlalchemy/sql/lambdas.py:188: in <listcomp>
    getter(closure, opts, anon_map, bindparams)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

closure = (<cell at 0x7fa09b24b280: Mapper object at 0x7fa0ad452df0>, <cell at 0x7fa09b24bd60: list object at 0x7fa0a15a3600>)
opts = LambdaOptions(enable_tracking=True, global_track_bound_values=False, lambda_cache={}, track_bound_values=True, track_c...fa0ad452df0; FormNode>, Column('parent_node_id', UUID(as_uuid=True), ForeignKey('form_nodes.id'), table=<form_nodes>)))
anon_map = {140328078485008: '0'}, bindparams = []

    def get(closure, opts, anon_map, bindparams):
>       return opts.track_on[idx]._gen_cache_key(anon_map, bindparams)
E       IndexError: tuple index out of range

I am getting them only if I ran my full test case no matter: parallel or in the sequence. When I ran a single test, single class or file, or even whole directory error did not occur. Please help me. Do you know what is happening?