ffill does not spread chunks when used with dask.array #6997
Description
What is your issue?
When using xarray with dask.array as in the following example:
import numpy as np
import xarray as xr
import dask
ds_ = xr.Dataset()
ds_["test"] = ("dim_0",), dask.array.from_array(
[0, 1, np.nan, np.nan, np.nan], chunks=2
)
then the ffill method does not seem to propagate through the underlying chunks used by dask.array.
In the example above, this means that
ds_.ffill("dim_0").compute().test.values
gives
>>> array([ 0., 1., 1., 1., nan])
where
ds_.compute().ffill("dim_0").test.values
gives
>>> array([0., 1., 1., 1., 1., 1.])
Is it an expected behavior ?