issue_comments: 541138033

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https://github.com/pydata/xarray/issues/3381#issuecomment-541138033 https://api.github.com/repos/pydata/xarray/issues/3381 541138033 MDEyOklzc3VlQ29tbWVudDU0MTEzODAzMw== 1217238 2019-10-11T16:42:11Z 2019-10-11T16:42:11Z MEMBER

Sparse only lets you combine arrays with different fill values if the result would also have a fixed value. That's why you can multiply or add but not concatenate, e.g., assert x.fill_value == 1 and y.fill_value == 2 assert (x + y).fill_value == 3 assert (x * y).fill_value == 2 np.stack([x, y]) # error, would need a mixture of different fill values to represent

Multiple fill values simply aren't representable by sparse's data model.

I think you could work this by wrapping the sparse arrays in dask first.

 
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