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REF: Defer creating Index._engine until needed #58370

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Merged
merged 1 commit into from
Apr 23, 2024
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REF: Defer creating Index._engine until needed #58370

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3 changes: 1 addition & 2 deletions pandas/core/frame.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4012,7 +4012,6 @@ def _get_value(self, index, col, takeable: bool = False) -> Scalar:
return series._values[index]

series = self._get_item(col)
engine = self.index._engine

if not isinstance(self.index, MultiIndex):
# CategoricalIndex: Trying to use the engine fastpath may give incorrect
Expand All @@ -4023,7 +4022,7 @@ def _get_value(self, index, col, takeable: bool = False) -> Scalar:

# For MultiIndex going through engine effectively restricts us to
# same-length tuples; see test_get_set_value_no_partial_indexing
loc = engine.get_loc(index)
loc = self.index._engine.get_loc(index)
return series._values[loc]

def isetitem(self, loc, value) -> None:
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3 changes: 2 additions & 1 deletion pandas/core/indexes/base.py
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Expand Up @@ -832,7 +832,8 @@ def _reset_identity(self) -> None:

@final
def _cleanup(self) -> None:
self._engine.clear_mapping()
if "_engine" in self._cache:
self._engine.clear_mapping()

@cache_readonly
def _engine(
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