issue_comments: 381728814

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https://github.com/pydata/xarray/issues/2064#issuecomment-381728814 https://api.github.com/repos/pydata/xarray/issues/2064 381728814 MDEyOklzc3VlQ29tbWVudDM4MTcyODgxNA== 1217238 2018-04-16T19:55:24Z 2018-04-16T19:55:24Z MEMBER

I stand corrected. in 0.10.1, I also see the Time variable getting added to refBottomDepth when I open multiple files. So maybe this is not in fact a new problem but an existing issue that happened to behave as I expected only when opening a single file in previous versions. Sorry for not noticing that sooner.

OK, in that case I think #2048 was still the right change/bug-fix, making multi-file and single-file behavior consistent.

But you certainly have exposed a real issue here.

But this issue raises an important basic point: we might want different behavior for variables in which concat_dim is already a dimension vs. variables for which it is not.

Yes, we shouldn't implicitly add a new dimensions to variables in the case where the dimension already exists in the dataset. We only need the heuristics/comparisons when an entirely new dimension is being added.

 
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