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  • encode_cf_datetime() casts dask arrays to NumPy arrays · 2 ✖

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595519344 https://github.com/pydata/xarray/issues/3834#issuecomment-595519344 https://api.github.com/repos/pydata/xarray/issues/3834 MDEyOklzc3VlQ29tbWVudDU5NTUxOTM0NA== shoyer 1217238 2020-03-06T00:47:45Z 2020-03-06T00:47:45Z MEMBER

Right, it casts to NumPy because it needs to look at the data to figure out units and calendar.

That said, if you pre-supply units and calendar there's no reason why it couldn't work with dask arrays. That would probably be a worthwhile refactor.

 
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   encode_cf_datetime() casts dask arrays to NumPy arrays 576502871
595466020 https://github.com/pydata/xarray/issues/3834#issuecomment-595466020 https://api.github.com/repos/pydata/xarray/issues/3834 MDEyOklzc3VlQ29tbWVudDU5NTQ2NjAyMA== jhamman 2443309 2020-03-05T21:52:16Z 2020-03-05T21:52:16Z MEMBER

Thanks @andersy005 for the clear example. Looking at encode_cf_datetime(), it seems like we didn't intend to make this function dask friendly. Perhaps @spencerkclark or @shoyer have thoughts on the prospects of making this work. My guess is that this will be pretty tricky, mostly because in some cases, we infer the units/dtype/etc on the fly. 

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   encode_cf_datetime() casts dask arrays to NumPy arrays 576502871

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