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Fix group_sum NaN comparison warnings #60749

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Merged
merged 1 commit into from
Jan 21, 2025
Merged

Fix group_sum NaN comparison warnings #60749

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20 changes: 9 additions & 11 deletions pandas/_libs/groupby.pyx
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Original file line number Diff line number Diff line change
Expand Up @@ -712,7 +712,7 @@ def group_sum(
int64_t[:, ::1] nobs
Py_ssize_t len_values = len(values), len_labels = len(labels)
bint uses_mask = mask is not None
bint isna_entry
bint isna_entry, isna_result

if len_values != len_labels:
raise ValueError("len(index) != len(labels)")
Expand Down Expand Up @@ -744,20 +744,18 @@ def group_sum(
for j in range(K):
val = values[i, j]

if not skipna and (
(uses_mask and result_mask[lab, j]) or
(is_datetimelike and sumx[lab, j] == NPY_NAT) or
_treat_as_na(sumx[lab, j], False)
):
# If sum is already NA, don't add to it. This is important for
# datetimelikebecause adding a value to NPY_NAT may not result
# in a NPY_NAT
continue

if uses_mask:
isna_entry = mask[i, j]
isna_result = result_mask[lab, j]
else:
isna_entry = _treat_as_na(val, is_datetimelike)
isna_result = _treat_as_na(sumx[lab, j], is_datetimelike)

if not skipna and isna_result:
# If sum is already NA, don't add to it. This is important for
# datetimelikebecause adding a value to NPY_NAT may not result
# in a NPY_NAT
continue

if not isna_entry:
nobs[lab, j] += 1
Expand Down
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