feat: Preserve null values in old Polars versions for ewm_mean #1574
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awesome, thanks @DeaMariaLeon ! just got a minor comment, then good to go 🚀
| ) | ||
| if self._backend_version < (1,): # pragma: no cover | ||
| pl = get_polars() |
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we should be ok to just import polars here in _polars
| if self._backend_version < (1,): # pragma: no cover | ||
| pl = get_polars() | ||
| return self._from_native_expr( | ||
| pl.when(expr.is_null()).then(None).otherwise(native_expr).name.keep() |
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does
pl.when(~expr.is_null()).then(native_expr).otherwise(None)
work? then it would mirror what you did for series
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