BUG: unhashable type error produced by pandas query
### 

- [X] I have checked that this issue has not already been reported.

- [X] I have confirmed this bug exists on the [latest version](https://pandas.pydata.org/docs/whatsnew/index.html) of pandas.

- [ ] I have confirmed this bug exists on the master branch of pandas.


### Reproducible Example

```python
import pandas as pd
x = pd.DataFrame({'a': [1,2]})
x = x.query('a.isna()')
```


### Issue Description

The code above produces the following error. This is in being run in a fresh (nothing else) conda environment with only python3.7 and pandas 1.3.3 installed.


Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/project_folder/env/lib/python3.7/site-packages/pandas/core/frame.py", line 4060, in query
    res = self.eval(expr, **kwargs)
  File "/project_folder/env/lib/python3.7/site-packages/pandas/core/frame.py", line 4191, in eval
    return _eval(expr, inplace=inplace, **kwargs)
  File "/project_folder/env/lib/python3.7/site-packages/pandas/core/computation/eval.py", line 353, in eval
    ret = eng_inst.evaluate()
  File "/project_folder/env/lib/python3.7/site-packages/pandas/core/computation/engines.py", line 80, in evaluate
    res = self._evaluate()
  File "/project_folder/env/lib/python3.7/site-packages/pandas/core/computation/engines.py", line 120, in _evaluate
    _check_ne_builtin_clash(self.expr)
  File "/project_folder/env/lib/python3.7/site-packages/pandas/core/computation/engines.py", line 36, in _check_ne_builtin_clash
    names = expr.names
  File "/project_folder/env/lib/python3.7/site-packages/pandas/core/computation/expr.py", line 833, in names
    return frozenset([self.terms.name])
TypeError: unhashable type: 'Series'

### Expected Behavior

Did not expect an error. Pretty sure this used to work, but now it does not. Considering that this happening in a fresh conda environment, not sure what in my setup could be causing this.



### Installed Versions

<details>

INSTALLED VERSIONS
------------------
commit           : 73c68257545b5f8530b7044f56647bd2db92e2ba
python           : 3.7.0.final.0
python-bits      : 64
OS               : Darwin
OS-release       : 19.6.0
Version          : Darwin Kernel Version 19.6.0: Thu Sep 16 20:58:47 PDT 2021; root:xnu-6153.141.40.1~1/RELEASE_X86_64
machine          : x86_64
processor        : i386
byteorder        : little
LC_ALL           : None
LANG             : en_US.UTF-8
LOCALE           : en_US.UTF-8

pandas           : 1.3.3
numpy            : 1.20.3
pytz             : 2021.1
dateutil         : 2.8.2
pip              : 21.2.2
setuptools       : 58.0.4
Cython           : None
pytest           : None
hypothesis       : None
sphinx           : None
blosc            : None
feather          : None
xlsxwriter       : None
lxml.etree       : None
html5lib         : None
pymysql          : None
psycopg2         : None
jinja2           : None
IPython          : None
pandas_datareader: None
bs4              : None
bottleneck       : 1.3.2
fsspec           : None
fastparquet      : None
gcsfs            : None
matplotlib       : None
numexpr          : 2.7.3
odfpy            : None
openpyxl         : None
pandas_gbq       : None
pyarrow          : None
pyxlsb           : None
s3fs             : None
scipy            : None
sqlalchemy       : None
tables           : None
tabulate         : None
xarray           : None
xlrd             : None
xlwt             : None
numba            : None

</details>
