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Revert "REF: remove special casing from Index.equals (always dispatchto subclass) (#35330)" #38560

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Merged
merged 1 commit into from
Dec 18, 2020
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Revert "REF: remove special casing from Index.equals (always dispatchto subclass) (#35330)" #38560

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19 changes: 10 additions & 9 deletions pandas/core/indexes/base.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4442,15 +4442,16 @@ def equals(self, other: object) -> bool:
if not isinstance(other, Index):
return False

# If other is a subclass of self and defines its own equals method, we
# dispatch to the subclass method. For instance for a MultiIndex,
# a d-level MultiIndex can equal d-tuple Index.
# Note: All EA-backed Index subclasses override equals
if (
isinstance(other, type(self))
and type(other) is not type(self)
and other.equals is not self.equals
):
if is_object_dtype(self.dtype) and not is_object_dtype(other.dtype):
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@jbrockmendel

let's make this an elif & put a big note that these are perf sensitive checks (followon)

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note that this also hits the MultiIndex path

# if other is not object, use other's logic for coercion
return other.equals(self)

if isinstance(other, ABCMultiIndex):
# d-level MultiIndex can equal d-tuple Index
return other.equals(self)

if is_extension_array_dtype(other.dtype):
# All EA-backed Index subclasses override equals
return other.equals(self)

return array_equivalent(self._values, other._values)
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