Replace hash groupby internals with HashCSR - #24050

Draft

PointKernel wants to merge 9 commits into

NVIDIA:mainfrom

PointKernel:hashcsr-groupby

Commits on Sep 9, 2026

Replace hash groupby internals with HashCSR
PointKernel
committed
b77c006
Store only row indices in the groupby HashCSR table
PointKernel
committed
7d546ba
Fuse sum and sum of squares on the by-key groupby path
PointKernel
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67c719a
Read HashCSR slots through L1 in the groupby build
PointKernel
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8a906f2
Size the groupby HashCSR table from a sampled cardinality estimate
PointKernel
committed
d64276f
Pack small groups into the segmented reduce on the hash groupby path
PointKernel
committed
346cc49
Fuse the null mask into nullable hash groupby reductions
PointKernel
committed
11d3dd1

Commits on Sep 10, 2026

Fix HashCSR correctness and reduce grouping scratch memory
PointKernel
committed
ea84e5c
Merge upstream main into hashcsr-groupby
PointKernel
committed
a9a2b8b