issue_comments: 683634677

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https://github.com/pydata/xarray/pull/4392#issuecomment-683634677 https://api.github.com/repos/pydata/xarray/issues/4392 683634677 MDEyOklzc3VlQ29tbWVudDY4MzYzNDY3Nw== 5821660 2020-08-31T08:11:52Z 2020-08-31T08:12:25Z MEMBER

As laid out in #4372 the behaviour before #4060 was to run blockwise with automatically aligning non-core dimensions (permit rechunking). For multiple chunks in core dimensions a ValueError would have been thrown.

If I understand the comments of @dcherian and @shoyer in #4372 correctly, allow_rechunk should be set True in the first case but not in the second.

This PR just checks for the dask ValueError which is raised for non-core dimension chunk mismatch, issues a warning, that the behaviour will change in the future (not sure if this is intended, please recommend otherwise) and reruns apply_gufunc with allow_rechunk=True. For the second case the dask ValueError is raised. 

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