We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
BUG: File pseudo-backends failing for missing pandas option
The next code is failing in master since #2833:

```python
>>> import ibis
>>> con = ibis.csv.connect('/home/mgarcia/src/ibis/ci/ibis-testing-data/')
>>> expr = con.table('functional_alltypes')['double_col'] * 2
>>> print(expr.execute())
OptionError: "No such keys(s): 'pandas.enable_trace'"
```

The problem is when the `csv` backend  (or other file backends) are loaded, but the pandas backend is not. This is because `ibis.pandas` loads the pandas options, which looks like they are needed by the file pseudo-backends.

The CI is not failing, I guess because we test pandas and the file backends are tested together, and pandas is loaded when the file backends are tested.

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `ibis/backends/base/file/__init__.py`
Content:
```
1 from pathlib import Path
2 
3 import ibis.expr.types as ir
4 from ibis.backends.base import BaseBackend, Client, Database
5 from ibis.backends.pandas.core import execute_and_reset
6 
7 
8 class FileClient(Client):
9     def __init__(self, backend, root):
10         self.backend = backend
11         self.extension = backend.extension
12         self.table_class = backend.table_class
13         self.root = Path(str(root))
14         self.dictionary = {}
15 
16     def insert(self, path, expr, **kwargs):
17         raise NotImplementedError
18 
19     def table(self, name, path):
20         raise NotImplementedError
21 
22     def database(self, name=None, path=None):
23         if name is None:
24             return FileDatabase('root', self, path=path)
25 
26         if name not in self.list_databases(path):
27             raise AttributeError(name)
28         if path is None:
29             path = self.root
30 
31         new_name = "{}.{}".format(name, self.extension)
32         if (self.root / name).is_dir():
33             path /= name
34         elif not str(path).endswith(new_name):
35             path /= new_name
36 
37         return FileDatabase(name, self, path=path)
38 
39     def execute(self, expr, params=None, **kwargs):  # noqa
40         assert isinstance(expr, ir.Expr)
41         return execute_and_reset(expr, params=params, **kwargs)
42 
43     def list_tables(self, path=None):
44         raise NotImplementedError
45 
46     def _list_tables_files(self, path=None):
47         # tables are files in a dir
48         if path is None:
49             path = self.root
50 
51         tables = []
52         if path.is_dir():
53             for d in path.iterdir():
54                 if d.is_file():
55                     if str(d).endswith(self.extension):
56                         tables.append(d.stem)
57         elif path.is_file():
58             if str(path).endswith(self.extension):
59                 tables.append(path.stem)
60         return tables
61 
62     def list_databases(self, path=None):
63         raise NotImplementedError
64 
65     def _list_databases_dirs(self, path=None):
66         # databases are dir
67         if path is None:
68             path = self.root
69 
70         tables = []
71         if path.is_dir():
72             for d in path.iterdir():
73                 if d.is_dir():
74                     tables.append(d.name)
75         return tables
76 
77     def _list_databases_dirs_or_files(self, path=None):
78         # databases are dir & file
79         if path is None:
80             path = self.root
81 
82         tables = []
83         if path.is_dir():
84             for d in path.iterdir():
85                 if d.is_dir():
86                     tables.append(d.name)
87                 elif d.is_file():
88                     if str(d).endswith(self.extension):
89                         tables.append(d.stem)
90         elif path.is_file():
91             # by definition we are at the db level at this point
92             pass
93 
94         return tables
95 
96 
97 class FileDatabase(Database):
98     def __init__(self, name, client, path=None):
99         super().__init__(name, client)
100         self.path = path
101 
102     def __str__(self):
103         return '{0.__class__.__name__}({0.name})'.format(self)
104 
105     def __dir__(self):
106         dbs = self.list_databases(path=self.path)
107         tables = self.list_tables(path=self.path)
108         return sorted(set(dbs).union(set(tables)))
109 
110     def __getattr__(self, name):
111         try:
112             return self.table(name, path=self.path)
113         except AttributeError:
114             return self.database(name, path=self.path)
115 
116     def table(self, name, path):
117         return self.client.table(name, path=path)
118 
119     def database(self, name=None, path=None):
120         return self.client.database(name=name, path=path)
121 
122     def list_databases(self, path=None):
123         if path is None:
124             path = self.path
125         return sorted(self.client.list_databases(path=path))
126 
127     def list_tables(self, path=None):
128         if path is None:
129             path = self.path
130         return sorted(self.client.list_tables(path=path))
131 
132 
133 class BaseFileBackend(BaseBackend):
134     """
135     Base backend class for pandas pseudo-backends for file formats.
136     """
137 
138     def connect(self, path):
139         """Create a Client for use with Ibis
140 
141         Parameters
142         ----------
143         path : str or pathlib.Path
144 
145         Returns
146         -------
147         Client
148         """
149         return self.client_class(backend=self, root=path)
150
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/ibis/backends/base/file/__init__.py b/ibis/backends/base/file/__init__.py
--- a/ibis/backends/base/file/__init__.py
+++ b/ibis/backends/base/file/__init__.py
@@ -1,9 +1,13 @@
 from pathlib import Path
 
+import ibis
 import ibis.expr.types as ir
 from ibis.backends.base import BaseBackend, Client, Database
 from ibis.backends.pandas.core import execute_and_reset
 
+# Load options of pandas backend
+ibis.pandas
+
 
 class FileClient(Client):
     def __init__(self, backend, root):

{"golden_diff": "diff --git a/ibis/backends/base/file/__init__.py b/ibis/backends/base/file/__init__.py\n--- a/ibis/backends/base/file/__init__.py\n+++ b/ibis/backends/base/file/__init__.py\n@@ -1,9 +1,13 @@\n from pathlib import Path\n \n+import ibis\n import ibis.expr.types as ir\n from ibis.backends.base import BaseBackend, Client, Database\n from ibis.backends.pandas.core import execute_and_reset\n \n+# Load options of pandas backend\n+ibis.pandas\n+\n \n class FileClient(Client):\n     def __init__(self, backend, root):\n", "issue": "BUG: File pseudo-backends failing for missing pandas option\nThe next code is failing in master since #2833:\r\n\r\n```python\r\n>>> import ibis\r\n>>> con = ibis.csv.connect('/home/mgarcia/src/ibis/ci/ibis-testing-data/')\r\n>>> expr = con.table('functional_alltypes')['double_col'] * 2\r\n>>> print(expr.execute())\r\nOptionError: \"No such keys(s): 'pandas.enable_trace'\"\r\n```\r\n\r\nThe problem is when the `csv` backend  (or other file backends) are loaded, but the pandas backend is not. This is because `ibis.pandas` loads the pandas options, which looks like they are needed by the file pseudo-backends.\r\n\r\nThe CI is not failing, I guess because we test pandas and the file backends are tested together, and pandas is loaded when the file backends are tested.\n", "before_files": [{"content": "from pathlib import Path\n\nimport ibis.expr.types as ir\nfrom ibis.backends.base import BaseBackend, Client, Database\nfrom ibis.backends.pandas.core import execute_and_reset\n\n\nclass FileClient(Client):\n    def __init__(self, backend, root):\n        self.backend = backend\n        self.extension = backend.extension\n        self.table_class = backend.table_class\n        self.root = Path(str(root))\n        self.dictionary = {}\n\n    def insert(self, path, expr, **kwargs):\n        raise NotImplementedError\n\n    def table(self, name, path):\n        raise NotImplementedError\n\n    def database(self, name=None, path=None):\n        if name is None:\n            return FileDatabase('root', self, path=path)\n\n        if name not in self.list_databases(path):\n            raise AttributeError(name)\n        if path is None:\n            path = self.root\n\n        new_name = \"{}.{}\".format(name, self.extension)\n        if (self.root / name).is_dir():\n            path /= name\n        elif not str(path).endswith(new_name):\n            path /= new_name\n\n        return FileDatabase(name, self, path=path)\n\n    def execute(self, expr, params=None, **kwargs):  # noqa\n        assert isinstance(expr, ir.Expr)\n        return execute_and_reset(expr, params=params, **kwargs)\n\n    def list_tables(self, path=None):\n        raise NotImplementedError\n\n    def _list_tables_files(self, path=None):\n        # tables are files in a dir\n        if path is None:\n            path = self.root\n\n        tables = []\n        if path.is_dir():\n            for d in path.iterdir():\n                if d.is_file():\n                    if str(d).endswith(self.extension):\n                        tables.append(d.stem)\n        elif path.is_file():\n            if str(path).endswith(self.extension):\n                tables.append(path.stem)\n        return tables\n\n    def list_databases(self, path=None):\n        raise NotImplementedError\n\n    def _list_databases_dirs(self, path=None):\n        # databases are dir\n        if path is None:\n            path = self.root\n\n        tables = []\n        if path.is_dir():\n            for d in path.iterdir():\n                if d.is_dir():\n                    tables.append(d.name)\n        return tables\n\n    def _list_databases_dirs_or_files(self, path=None):\n        # databases are dir & file\n        if path is None:\n            path = self.root\n\n        tables = []\n        if path.is_dir():\n            for d in path.iterdir():\n                if d.is_dir():\n                    tables.append(d.name)\n                elif d.is_file():\n                    if str(d).endswith(self.extension):\n                        tables.append(d.stem)\n        elif path.is_file():\n            # by definition we are at the db level at this point\n            pass\n\n        return tables\n\n\nclass FileDatabase(Database):\n    def __init__(self, name, client, path=None):\n        super().__init__(name, client)\n        self.path = path\n\n    def __str__(self):\n        return '{0.__class__.__name__}({0.name})'.format(self)\n\n    def __dir__(self):\n        dbs = self.list_databases(path=self.path)\n        tables = self.list_tables(path=self.path)\n        return sorted(set(dbs).union(set(tables)))\n\n    def __getattr__(self, name):\n        try:\n            return self.table(name, path=self.path)\n        except AttributeError:\n            return self.database(name, path=self.path)\n\n    def table(self, name, path):\n        return self.client.table(name, path=path)\n\n    def database(self, name=None, path=None):\n        return self.client.database(name=name, path=path)\n\n    def list_databases(self, path=None):\n        if path is None:\n            path = self.path\n        return sorted(self.client.list_databases(path=path))\n\n    def list_tables(self, path=None):\n        if path is None:\n            path = self.path\n        return sorted(self.client.list_tables(path=path))\n\n\nclass BaseFileBackend(BaseBackend):\n    \"\"\"\n    Base backend class for pandas pseudo-backends for file formats.\n    \"\"\"\n\n    def connect(self, path):\n        \"\"\"Create a Client for use with Ibis\n\n        Parameters\n        ----------\n        path : str or pathlib.Path\n\n        Returns\n        -------\n        Client\n        \"\"\"\n        return self.client_class(backend=self, root=path)\n", "path": "ibis/backends/base/file/__init__.py"}], "after_files": [{"content": "from pathlib import Path\n\nimport ibis\nimport ibis.expr.types as ir\nfrom ibis.backends.base import BaseBackend, Client, Database\nfrom ibis.backends.pandas.core import execute_and_reset\n\n# Load options of pandas backend\nibis.pandas\n\n\nclass FileClient(Client):\n    def __init__(self, backend, root):\n        self.backend = backend\n        self.extension = backend.extension\n        self.table_class = backend.table_class\n        self.root = Path(str(root))\n        self.dictionary = {}\n\n    def insert(self, path, expr, **kwargs):\n        raise NotImplementedError\n\n    def table(self, name, path):\n        raise NotImplementedError\n\n    def database(self, name=None, path=None):\n        if name is None:\n            return FileDatabase('root', self, path=path)\n\n        if name not in self.list_databases(path):\n            raise AttributeError(name)\n        if path is None:\n            path = self.root\n\n        new_name = \"{}.{}\".format(name, self.extension)\n        if (self.root / name).is_dir():\n            path /= name\n        elif not str(path).endswith(new_name):\n            path /= new_name\n\n        return FileDatabase(name, self, path=path)\n\n    def execute(self, expr, params=None, **kwargs):  # noqa\n        assert isinstance(expr, ir.Expr)\n        return execute_and_reset(expr, params=params, **kwargs)\n\n    def list_tables(self, path=None):\n        raise NotImplementedError\n\n    def _list_tables_files(self, path=None):\n        # tables are files in a dir\n        if path is None:\n            path = self.root\n\n        tables = []\n        if path.is_dir():\n            for d in path.iterdir():\n                if d.is_file():\n                    if str(d).endswith(self.extension):\n                        tables.append(d.stem)\n        elif path.is_file():\n            if str(path).endswith(self.extension):\n                tables.append(path.stem)\n        return tables\n\n    def list_databases(self, path=None):\n        raise NotImplementedError\n\n    def _list_databases_dirs(self, path=None):\n        # databases are dir\n        if path is None:\n            path = self.root\n\n        tables = []\n        if path.is_dir():\n            for d in path.iterdir():\n                if d.is_dir():\n                    tables.append(d.name)\n        return tables\n\n    def _list_databases_dirs_or_files(self, path=None):\n        # databases are dir & file\n        if path is None:\n            path = self.root\n\n        tables = []\n        if path.is_dir():\n            for d in path.iterdir():\n                if d.is_dir():\n                    tables.append(d.name)\n                elif d.is_file():\n                    if str(d).endswith(self.extension):\n                        tables.append(d.stem)\n        elif path.is_file():\n            # by definition we are at the db level at this point\n            pass\n\n        return tables\n\n\nclass FileDatabase(Database):\n    def __init__(self, name, client, path=None):\n        super().__init__(name, client)\n        self.path = path\n\n    def __str__(self):\n        return '{0.__class__.__name__}({0.name})'.format(self)\n\n    def __dir__(self):\n        dbs = self.list_databases(path=self.path)\n        tables = self.list_tables(path=self.path)\n        return sorted(set(dbs).union(set(tables)))\n\n    def __getattr__(self, name):\n        try:\n            return self.table(name, path=self.path)\n        except AttributeError:\n            return self.database(name, path=self.path)\n\n    def table(self, name, path):\n        return self.client.table(name, path=path)\n\n    def database(self, name=None, path=None):\n        return self.client.database(name=name, path=path)\n\n    def list_databases(self, path=None):\n        if path is None:\n            path = self.path\n        return sorted(self.client.list_databases(path=path))\n\n    def list_tables(self, path=None):\n        if path is None:\n            path = self.path\n        return sorted(self.client.list_tables(path=path))\n\n\nclass BaseFileBackend(BaseBackend):\n    \"\"\"\n    Base backend class for pandas pseudo-backends for file formats.\n    \"\"\"\n\n    def connect(self, path):\n        \"\"\"Create a Client for use with Ibis\n\n        Parameters\n        ----------\n        path : str or pathlib.Path\n\n        Returns\n        -------\n        Client\n        \"\"\"\n        return self.client_class(backend=self, root=path)\n", "path": "ibis/backends/base/file/__init__.py"}]}