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A view could only map source rows one to one, or one to many through a FROM-position item, so nothing could see all the rows sharing a key. A view query now takes `GROUP BY expr, ...` with aggregate projections, planned and executed by DataFusion over the lance scan. A group spans fragments, so a grouped view is recomputed in full whenever its source changes; each row's provenance is its group's smallest source row id. Such a query is stored as definition format 2, so a reader that predates grouping reports the view as unrefreshable instead of failing to parse it. Stacked on #4190.