issue_comments: 392649605

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https://github.com/pydata/xarray/issues/1603#issuecomment-392649605 https://api.github.com/repos/pydata/xarray/issues/1603 392649605 MDEyOklzc3VlQ29tbWVudDM5MjY0OTYwNQ== 1217238 2018-05-29T04:28:45Z 2018-05-29T04:28:45Z MEMBER

I started thinking about how to do this incrementally, and it occurs to me that a good place to start would be to write some of the utility functions we'll need for this: 1. Normalizing and creating default indexes in the Dataset/DataArray constructor. 2. Combining indexes from all xarray objects that are inputs for an operations into indexes for the outputs. 3. Extracting MultiIndex objects from arguments into Dataset/DataArray and expanding them into multiple variables.

I drafted up docstrings for each of these functions and did a little bit of working starting to think through implementations in https://github.com/pydata/xarray/pull/2195. So this would be a great place for others to help out. Each of these could be separate PRs.

 
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