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https://github.com/pydata/xarray/issues/2064#issuecomment-511987332 https://api.github.com/repos/pydata/xarray/issues/2064 511987332 MDEyOklzc3VlQ29tbWVudDUxMTk4NzMzMg== 10638475 2019-07-16T21:06:58Z 2019-07-16T21:06:58Z NONE

@shoyer I'm sorry I didn't look at your examples more closely at first. I see now that your first example of using data_vars='minimal' is already preserving one instance of the variable x, and I was suggesting earlier that this variable was not being included in the concatenation.

So I am not clear on why so many unit tests fail when I switch the default value for data_vars to 'minimal'. The output from your examples seems compatible with Pandas concat, though I don't understand Pandas very well yet.

I wonder if the unit tests that fail are written correctly. I have to add that I spent an entire day trying to understand the code in concat.py, by stepping through it for several unit tests. I found the code quite difficult to understand.

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