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Fix performance regression in Coordinates.to_index #11306

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Merged
ianhi merged 2 commits into from
Apr 22, 2026
+5 −1
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Fix performance regression in Coordinates.to_index #11306

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f647a5c
Fix Coordinates.to_index performance regression
thodson-usgs Apr 18, 2026
941690a
Re-trigger CI
thodson-usgs Apr 22, 2026
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4 changes: 4 additions & 0 deletions doc/whats-new.rst
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Expand Up @@ -26,6 +26,10 @@ Deprecations
Bug Fixes
~~~~~~~~~

- Fix a major performance regression in :py:meth:`Coordinates.to_index` (and
consequently :py:meth:`Dataset.to_dataframe`) caused by converting the cached
code ndarrays into Python lists (:issue:`11305`).


Documentation
~~~~~~~~~~~~~
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2 changes: 1 addition & 1 deletion xarray/core/coordinates.py
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Expand Up @@ -194,7 +194,7 @@ def to_index(self, ordered_dims: Sequence[Hashable] | None = None) -> pd.Index:

return pd.MultiIndex(
levels=level_list, # type: ignore[arg-type,unused-ignore]
codes=[list(c) for c in code_list],
codes=code_list, # type: ignore[arg-type,unused-ignore]
names=names,
)

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