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12 changes: 10 additions & 2 deletions pandas/_libs/groupby_helper.pxi.in
Original file line number Diff line number Diff line change
Expand Up @@ -76,7 +76,11 @@ def group_last_{{name}}({{c_type}}[:, :] out,
val = values[i, j]

# not nan
if val == val and val != {{nan_val}}:
if (
{{if not name.startswith("int")}}
val == val and
{{endif}}
val != {{nan_val}}):
nobs[lab, j] += 1
resx[lab, j] = val

Expand Down Expand Up @@ -133,7 +137,11 @@ def group_nth_{{name}}({{c_type}}[:, :] out,
val = values[i, j]

# not nan
if val == val and val != {{nan_val}}:
if (
{{if not name.startswith("int")}}
val == val and
{{endif}}
val != {{nan_val}}):
nobs[lab, j] += 1
if nobs[lab, j] == rank:
resx[lab, j] = val
Expand Down
8 changes: 6 additions & 2 deletions pandas/_libs/hashtable_class_helper.pxi.in
Original file line number Diff line number Diff line change
Expand Up @@ -424,8 +424,12 @@ cdef class {{name}}HashTable(HashTable):
for i in range(n):
val = values[i]

if ignore_na and (val != val
or (use_na_value and val == na_value2)):
if ignore_na and (
{{if not name.lower().startswith(("uint", "int"))}}
val != val or
{{endif}}
(use_na_value and val == na_value2)
):
# if missing values do not count as unique values (i.e. if
# ignore_na is True), skip the hashtable entry for them,
# and replace the corresponding label with na_sentinel
Expand Down