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doc/enh: clarify whether nw.GroupBy maintains order or not / add maintain_order to DataFrame.group_by #3309
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What type of report is this?
Improvement
Please describe the issue.
I assume it doesn't, but it's not stated anywhere in the docs, and it lacks the maintain_order argument from Polars.
If you have a suggestion on how it should be, add it below.
No response
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MarcoGorelli commentedon Nov 28, 2025
currently there's no guarantees
i think i'd be open to adding the option for the
DataFrame(notLazyFrame) case[-][Doc]: clarify whether `nw.GroupBy` maintains order or not[/-][+]doc/enh: clarify whether `nw.GroupBy` maintains order or not / add `maintain_order` to `DataFrame.group_by`[/+]MarcoGorelli commentedon Sep 21, 2026
this came up here plotly/plotly.py#5766
I think that adding
maintain_orderto eagergroup_bywould be good 👍Add TODO pointing at the narwhals maintain_order follow up
Stewyn commentedon Oct 7, 2026
I've started working on this