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CLN: improve is_unique check in Index.intersection #38154

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Merged
merged 5 commits into from
Dec 2, 2020
Merged

CLN: improve is_unique check in Index.intersection #38154

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79d6a50
Improve is_unqiue check
phofl Nov 29, 2020
53e69f7
Improve assert
phofl Nov 29, 2020
6ec04c1
Remove index
phofl Nov 29, 2020
cd1acca
Add unique check to Index.unique
phofl Nov 29, 2020
aba0f2a
Add shallow copy
phofl Nov 29, 2020
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Add unique check to Index.unique
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@phofl
phofl committed Nov 29, 2020
commit cd1accad31d7ff2f13705c919f574c4caaa0288f
10 changes: 5 additions & 5 deletions pandas/core/indexes/base.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2379,6 +2379,10 @@ def unique(self, level=None):
"""
if level is not None:
self._validate_index_level(level)

if self.is_unique:
return self
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@jreback jreback Nov 29, 2020

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this needs to return self._shallow_copy()
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@phofl phofl Nov 29, 2020

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Thx.

result = super().unique()
return self._shallow_copy(result)

Expand Down Expand Up @@ -2858,11 +2862,7 @@ def _intersection(self, other, sort=False):
indexer = algos.unique1d(Index(rvals).get_indexer_non_unique(lvals)[0])
indexer = indexer[indexer != -1]

result = other.take(indexer)
if not result.is_unique:
result = result.unique()._values
else:
result = result._values
result = other.take(indexer).unique()._values

if sort is None:
result = algos.safe_sort(result)
Expand Down