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Backport PR #41972 on branch 1.3.x (PERF: indexing on UInt64Index with int64s) #42029

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Merged
merged 1 commit into from
Jun 15, 2021
Merged

Backport PR #41972 on branch 1.3.x (PERF: indexing on UInt64Index with int64s) #42029

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7 changes: 7 additions & 0 deletions pandas/core/indexes/base.py
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Original file line number Diff line number Diff line change
Expand Up @@ -5303,6 +5303,13 @@ def _maybe_promote(self, other: Index) -> tuple[Index, Index]:
if not is_object_dtype(self.dtype):
return self.astype("object"), other.astype("object")

elif self.dtype.kind == "u" and other.dtype.kind == "i":
# GH#41873
if other.min() >= 0:
# lookup min as it may be cached
# TODO: may need itemsize check if we have non-64-bit Indexes
return self, other.astype(self.dtype)

if not is_object_dtype(self.dtype) and is_object_dtype(other.dtype):
# Reverse op so we dont need to re-implement on the subclasses
other, self = other._maybe_promote(self)
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