issue_comments: 949401881

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https://github.com/pydata/xarray/issues/1603#issuecomment-949401881 https://api.github.com/repos/pydata/xarray/issues/1603 949401881 IC_kwDOAMm_X844lrkZ 38346144 2021-10-22T08:25:54Z 2021-10-22T08:25:54Z NONE

Thanks for the detailed description @weipeng1999. For the first 4 slides I don't see how this is different from how does S_res = S1.sel(C1=['a', 'b'] and S_res = S2.sel(C1=['a', 'b']) currently? And for the last 2 slides, I don't think that we always want such implicit broadcasting for dimensions that are not involved in the indexed coordinates.

thank you for figuring out the wrong things what I done. Well, it' is hard to explain the idea because it is a bit complicated, the last two picture is wrong and make misunderstanding, here are two images explain what I actuarily mean: 

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