issue_comments: 372544809

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https://github.com/pydata/xarray/issues/1985#issuecomment-372544809 https://api.github.com/repos/pydata/xarray/issues/1985 372544809 MDEyOklzc3VlQ29tbWVudDM3MjU0NDgwOQ== 6815844 2018-03-13T04:39:47Z 2018-03-13T04:39:47Z MEMBER

When I load the sub-dataset after using the indexing routines, does xarray need to read the whole original 4D variable?

I don't think so. We support lazy indexing for any dimensional arrays (but not coordinate variables). What does your data (especially '4Dvariable.nc') look like? Is Xp1 coordinate or sufficiently small? ds['Xp1'].values loads Xp1 into the memory.

 
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