issues: 299606951

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id node_id number title user state locked assignee milestone comments created_at updated_at closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
299606951 MDU6SXNzdWUyOTk2MDY5NTE= 1937 `isnull` loads dask array 6815844 closed 0     0 2018-02-23T05:54:58Z 2018-02-25T20:52:16Z 2018-02-25T20:52:16Z MEMBER      

From gitter cc. @davidh-ssec

python In [1]: import numpy as np ...: import xarray as xr ...: ...: da = xr.DataArray(np.arange(100), dims='x').chunk({'x': 10}) ...: da.isnull() ...: Out[1]: <xarray.DataArray (x: 100)> array([False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False], dtype=bool) Dimensions without coordinates: x

Problem description

DataArray.isnull() automatically computes dask arrays.

Expected Output

python Out[2]: <xarray.DataArray (x: 100)> dask.array<shape=(100,), dtype=bool, chunksize=(10,)> Dimensions without coordinates: x

Cause

https://github.com/pydata/xarray/blob/697cc74b9af5fbfedadd54fd07019ce7684553ec/xarray/core/ops.py#L322-L324

Here, getattr(pd, name) should be getattr(duck_array_ops, name).

 
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   completed 13221727 issue

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