bug in DataFrame._set_index when the value is MultiIndex

[ajpotts]

See the example:

size = 10**8


arrays = [(np.arange(size)//2).tolist(), np.arange(size).tolist(),]

tuples = list(zip(*arrays))

tuples


index = pd.MultiIndex.from_tuples(tuples, names=["first", "second"])


s = pd.Series(np.random.randn(size), index=index)
s


df = s.to_frame()

Results in:

In [7]: ak.DataFrame(df)
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
File ~/git/arkouda/arkouda/pdarraycreation.py:279, in array(a, dtype, max_bits)
    278 while any(a != 0) and len(uint_arrays) < early_out:
--> 279     low, a = a % 2**64, a // 2**64
    280     uint_arrays.append(array(np.array(low, dtype=np.uint), dtype=akuint64))

TypeError: unsupported operand type(s) for %: 'tuple' and 'int'

During handling of the above exception, another exception occurred:

RuntimeError                              Traceback (most recent call last)
Cell In[7], line 1
----> 1 ak.DataFrame(df)

File ~/git/arkouda/arkouda/dataframe.py:928, in DataFrame.__init__(self, initialdata, index, columns)
    925 self._columns = initialdata.columns.tolist()
    927 if index is None:
--> 928     self._set_index(initialdata.index)
    929 else:
    930     self._set_index(index)

File ~/git/arkouda/arkouda/dataframe.py:1891, in DataFrame._set_index(self, value)
   1889     self._index = value
   1890 elif isinstance(value, (pdarray, Strings, pd.Index)):
-> 1891     self._index = Index(value)
   1892 elif isinstance(value, list):
   1893     self._index = Index(array(value))

File ~/anaconda3/envs/arkouda-dev/lib/python3.12/site-packages/typeguard/__init__.py:891, in typechecked.<locals>.wrapper(*args, **kwargs)
    889 memo = _CallMemo(python_func, _localns, args=args, kwargs=kwargs)
    890 check_argument_types(memo)
--> 891 retval = func(*args, **kwargs)
    892 check_return_type(retval, memo)
    894 # If a generator is returned, wrap it if its yield/send/return types can be checked

File ~/git/arkouda/arkouda/index.py:93, in Index.__init__(self, values, name, allow_list, max_list_size)
     91     self.values = Categorical(values.values)
     92 else:
---> 93     self.values = array(values.values)
     94 self.size = values.size
     95 self.dtype = self.values.dtype

File ~/git/arkouda/arkouda/pdarraycreation.py:283, in array(a, dtype, max_bits)
    281         return bigint_from_uint_arrays(uint_arrays[::-1], max_bits=max_bits)
    282     except TypeError:
--> 283         raise RuntimeError(f"Unhandled dtype {a.dtype}")
    284 else:
    285     from arkouda.util import _infer_shape_from_size

RuntimeError: Unhandled dtype object