issue_comments: 327886998

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https://github.com/pydata/xarray/issues/1560#issuecomment-327886998 https://api.github.com/repos/pydata/xarray/issues/1560 327886998 MDEyOklzc3VlQ29tbWVudDMyNzg4Njk5OA== 1217238 2017-09-07T18:36:48Z 2017-09-07T18:36:48Z MEMBER

This is still somewhat annoyingly slow, but for a 8000 x 9000 MultiIndex on pandas 0.21-dev, I measure 41 seconds for get_indexer() vs 3.8 seconds for equals().

So a fast-path might still be a good idea, but to get to truly interactive speeds, we might need a faster way to validate a MultiIndex as equal to the outer-product of its levels. Potentially we could save some metadata in PandasIndexAdapter as part of stack() to indicate that the levels are from an outer product: https://github.com/pydata/xarray/blob/98a05f11c6f38489c82e86c9e9df796e7fb65fd2/xarray/core/indexing.py#L502-L505

 
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