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BUG: hash_array TypeError instead of AttributeError on Index GH#42003 #45301

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Merged
jreback merged 4 commits into from
Jan 16, 2022
Merged

BUG: hash_array TypeError instead of AttributeError on Index GH#42003 #45301

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8d0d11c
BUG: hash_array TypeError instead of AttributeError on Index GH#42003
jbrockmendel Jan 10, 2022
a52bffd
Merge branch 'main' into err-42003
jbrockmendel Jan 13, 2022
3f9bd85
check for EA
jbrockmendel Jan 13, 2022
1d2fbb6
Merge branch 'main' into err-42003
jbrockmendel Jan 14, 2022
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12 changes: 10 additions & 2 deletions pandas/core/util/hashing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,7 @@
)
from pandas.core.dtypes.generic import (
ABCDataFrame,
ABCExtensionArray,
ABCIndex,
ABCMultiIndex,
ABCSeries,
Expand Down Expand Up @@ -286,10 +287,17 @@ def hash_array(
if is_categorical_dtype(dtype):
vals = cast("Categorical", vals)
return _hash_categorical(vals, encoding, hash_key)
elif not isinstance(vals, np.ndarray):
# i.e. ExtensionArray

elif isinstance(vals, ABCExtensionArray):
vals, _ = vals._values_for_factorize()

elif not isinstance(vals, np.ndarray):
# GH#42003
raise TypeError(
"hash_array requires np.ndarray or ExtensionArray, not "
f"{type(vals).__name__}. Use hash_pandas_object instead."
)

return _hash_ndarray(vals, encoding, hash_key, categorize)


Expand Down
9 changes: 9 additions & 0 deletions pandas/tests/util/test_hashing.py
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Expand Up @@ -71,6 +71,15 @@ def test_hash_array_errors(val):
hash_array(val)


def test_hash_array_index_exception():
# GH42003 TypeError instead of AttributeError
obj = pd.DatetimeIndex(["2018-10-28 01:20:00"], tz="Europe/Berlin")

msg = "Use hash_pandas_object instead"
with pytest.raises(TypeError, match=msg):
hash_array(obj)


def test_hash_tuples():
tuples = [(1, "one"), (1, "two"), (2, "one")]
result = hash_tuples(tuples)
Expand Down