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Backport PR #29243 on branch 1.0.x (Follow up PR: #28097 Simplify branch statement) #31689

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Merged
merged 1 commit into from
Feb 5, 2020
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Backport PR #29243 on branch 1.0.x (Follow up PR: #28097 Simplify branch statement) #31689

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6 changes: 3 additions & 3 deletions pandas/core/indexes/multi.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1270,10 +1270,10 @@ def _get_grouper_for_level(self, mapper, level):
# on the output of a groupby doesn't reflect back here.
level_index = level_index.copy()

if len(level_index):
grouper = level_index.take(codes)
else:
if level_index._can_hold_na:
grouper = level_index.take(codes, fill_value=True)
else:
grouper = level_index.take(codes)

return grouper, codes, level_index

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