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• I have confirmed this bug exists on the latest version of pandas.

• I have confirmed this bug exists on the main branch of pandas.

Reproducible Example

This bug is fixed by adding np.uintc to _factorizers in pd.merge. Could someone upload it fixed please?. For me the bug is fixed by adding in line 114 of core/reshape/merge.py file: np.uintc:libhastable.UInt32Factorizer.

import numpy as np
import pandas as pd

df1 = pd.DataFrame({'a':['foo','bar'],'b':np.array([1,2], dtype=np.uintc)})
df2 = pd.DataFrame({'a':['foo','baz'],'b':np.array([3,4], dtype=np.uintc)})
df3=df1.merge(df2, how = 'outer')
print(df3)

Issue Description

Traceback (most recent call last):
File "C:\Users\noname37486\PycharmProjects\pythonProject3\main.py", line 10, in
df3=df1.merge(df2, how = 'outer')
File "C:\Users\noname37486\PycharmProjects\pythonProject3\venv\lib\site-packages\pandas\core\frame.py", line 10832, in merge
return merge(
File "C:\Users\noname37486\PycharmProjects\pythonProject3\venv\lib\site-packages\pandas\core\reshape\merge.py", line 184, in merge
return op.get_result(copy=copy)
File "C:\Users\noname37486\PycharmProjects\pythonProject3\venv\lib\site-packages\pandas\core\reshape\merge.py", line 886, in get_result
join_index, left_indexer, right_indexer = self._get_join_info()
File "C:\Users\noname37486\PycharmProjects\pythonProject3\venv\lib\site-packages\pandas\core\reshape\merge.py", line 1151, in _get_join_info
(left_indexer, right_indexer) = self._get_join_indexers()
File "C:\Users\noname37486\PycharmProjects\pythonProject3\venv\lib\site-packages\pandas\core\reshape\merge.py", line 1125, in _get_join_indexers
return get_join_indexers(
File "C:\Users\noname37486\PycharmProjects\pythonProject3\venv\lib\site-packages\pandas\core\reshape\merge.py", line 1740, in get_join_indexers
zipped = zip(*mapped)
File "C:\Users\v\PycharmProjects\pythonProject3\venv\lib\site-packages\pandas\core\reshape\merge.py", line 1737, in
_factorize_keys(left_keys[n], right_keys[n], sort=sort)
File "C:\Users\noname37486\PycharmProjects\pythonProject3\venv\lib\site-packages\pandas\core\reshape\merge.py", line 2539, in _factorize_keys
klass, lk, rk = _convert_arrays_and_get_rizer_klass(lk, rk)
File "C:\Users\noname37486\PycharmProjects\pythonProject3\venv\lib\site-packages\pandas\core\reshape\merge.py", line 2616, in _convert_arrays_and_get_rizer_klass
klass = _factorizers[lk.dtype.type]
KeyError: <class 'numpy.uintc'>

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