feat(collect): Collection.is_grouped / meta.grouped flag (#790) - #794
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collect_summaries(group_it=True) silently falls back to a wide, non-averaged frame when a group has < 2 cells. Surface whether averaging actually happened: CollectionMeta.grouped (set by collect_summaries) + a Collection.is_grouped property, so apps stop sniffing for a "mean" column. Field defaults False and round-trips through save/load. Closes #790 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
jepegit
enabled auto-merge (squash)
July 29, 2026 11:27
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collect_summaries(group_it=True)silently returns a wide, non-averaged frame when a group has < 2 cells. This surfaces whether averaging actually happened viaCollectionMeta.grouped+ aCollection.is_groupedproperty, so apps no longer sniff for ameancolumn. Defaults False; round-trips through save/load.Tests: grouped→True, single-cell fallback→False, default→False, save/load survives.
Closes #790
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