issues: 1119647191

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id node_id number title user state locked assignee milestone comments created_at updated_at closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
1119647191 I_kwDOAMm_X85CvHXX 6220 [FEATURE]: Use fast path when grouping by unique monotonic decreasing variable 2448579 open 0     1 2022-01-31T16:24:29Z 2023-01-09T16:48:58Z   MEMBER      

Is your feature request related to a problem?

See https://github.com/pydata/xarray/pull/6213/files#r795716713

We check whether the by variable for groupby is unique and monotonically increasing. But the fast path would also apply to unique and monotonically decreasing variables.

Describe the solution you'd like

Update the condition to is_monotonic_increasing or is_monotonic_decreasing and add a test.

Describe alternatives you've considered

No response

Additional context

No response

 
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     13221727 issue

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