TST: tz-aware grouper/map returning tz-naive (GH#57192)#65997
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Add regression tests covering DatetimeIndex.map and groupby with a function that strips the tz; the result should be tz-naive rather than re-localized to the original tz. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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…5997) Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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closes #57192
Grouping a tz-aware
DatetimeIndexby a function that strips the tz (e.g.ts.normalize().tz_convert(None)) used to give back group keys re-localized to the original tz instead of the tz-naive values the function returned. Same forDatetimeIndex.map.This was a regression introduced by
EA._from_scalars(GH-53089) and already fixed by theEA._cast_pointwise_resultrefactor (GH-62105), which no longer routes theNDArrayBackedmap path through_from_scalars. Adding regression tests at both themap(root cause) and groupby (reported) levels.