issue_comments: 387771898

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https://github.com/pydata/xarray/issues/2109#issuecomment-387771898 https://api.github.com/repos/pydata/xarray/issues/2109 387771898 MDEyOklzc3VlQ29tbWVudDM4Nzc3MTg5OA== 1217238 2018-05-09T15:08:38Z 2018-05-09T15:08:38Z MEMBER

You need to explicitly indicate that you want lazy loading with dask by specifying the chunks keyword argument to open_dataset(), or by calling .chunk() afterwards. If you do that, then yes operations like expand_dims() will be lazy.

Otherwise, files are opened with xarray's built-in lazy loading capabilities, which only supports lazy indexing (expand_dims() could potentially be supported, too, with some effort, but you are really best off switching to dask).

 
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