fix: nw.selectors.by_dtype(nw.Datetime) was excluding tz-aware for Polars
#1869
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MarcoGorelli
commented
Jan 26, 2025
narwhals/_polars/namespace.py
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| native_dtypes: list[pl.DataType | type[pl.DataType]] = [] | ||
| for dtype in dtypes: | ||
| native_dtype_instantiated = narwhals_to_native_dtype(dtype, self._version) | ||
| if isinstance(dtype, type) and issubclass(dtype, DType): | ||
| native_dtypes.append(native_dtype_instantiated.__class__) | ||
| else: | ||
| native_dtypes.append(native_dtype_instantiated) | ||
| return PolarsExpr( | ||
| pl.selectors.by_dtype( | ||
| [narwhals_to_native_dtype(dtype, self._version) for dtype in dtypes] | ||
| ), |
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the issue was that we were translating nw.Datetime to pl.Datetime(). In other parts of the codebase, that's fine. But here, we need to preserve whether the dtype is instantiated or not, as they behave differently
Like this, we keep the translation from nw.Datetime to pl.Datetime
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closes #1313
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