issue_comments: 302711547

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https://github.com/pydata/xarray/pull/1413#issuecomment-302711547 https://api.github.com/repos/pydata/xarray/issues/1413 302711547 MDEyOklzc3VlQ29tbWVudDMwMjcxMTU0Nw== 1217238 2017-05-19T14:04:05Z 2017-05-19T14:04:05Z MEMBER

What is xr.align(..., join='exact') supposed to do?

It verifies that all dimensions have the same length, and coordinates along all dimensions (used for indexing) also match. Unlike the normal version of align, it doesn't do any indexing -- the outputs are always the same as the inputs.

It does not check that the necessary dimensions and variables exist in all datasets. But we should do that as part of the logic in concat anyways, since the xarray data model always requires knowing variables and their dimensions.

 
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