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feat(v1): CSR-backed sparse groupby-sum - skew-independent build memory (6-9x on the #745 hub case)#870

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FBumann wants to merge 5 commits into
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feat/v1-sparse-groupby
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feat(v1): CSR-backed sparse groupby-sum - skew-independent build memory (6-9x on the #745 hub case)#870
FBumann wants to merge 5 commits into
feat/arithmetic-conventionfrom
feat/v1-sparse-groupby

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Commits on Jul 24, 2026