issue_comments: 789090356

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https://github.com/pydata/xarray/issues/2237#issuecomment-789090356 https://api.github.com/repos/pydata/xarray/issues/2237 789090356 MDEyOklzc3VlQ29tbWVudDc4OTA5MDM1Ng== 2448579 2021-03-02T17:48:01Z 2021-03-02T17:48:47Z MEMBER

Reading up on fusion, the docstring says

This optimization applies to all reductions–tasks that have at most one dependent–so it may be viewed as fusing “multiple input, single output” groups of tasks into a single task.

So we need the opposite : fuse "single input, multiple output" to a single task when some appropriate heuristic is satisfied. 

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