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Blosc / python-blosc2 Public

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New CTable.group_by() implementation#636

Open

FrancescAlted wants to merge 17 commits into

mainBlosc/python-blosc2:mainfrom

ctable-groupbyBlosc/python-blosc2:ctable-groupbyCopy head branch name to clipboard

Conversation Commits17 (17)Checks Files changed

Open

New CTable.group_by() implementation#636
FrancescAlted wants to merge 17 commits into
mainfrom
ctable-groupby

Commits

Commits on May 15, 2026

Initial basic functionality (phase 1 of plan completed)
FrancescAlted
committed
Fast path for one dense integer/dictionary-code key (8x speedup)
FrancescAlted
committed
Optimizing thing in cython (phase 2 going on). More than 2x speedup.
FrancescAlted
committed
Acceleration path for float32/64 as groupby keys. 25x speedup.
FrancescAlted
committed
Factorized all groupby accelerations in groupby_ext.pyx
FrancescAlted
committed
Add new tests and bench files
FrancescAlted
committed
Updated plan
FrancescAlted
committed
Fused integer-key kernels and more Cython aggregations
FrancescAlted
committed
Implemented arbitrary float hash table for floating point acceleration
FrancescAlted
committed
Add Cython group-by fast paths
FrancescAlted
committed
Aborted the full index sorted group_by path, and an explanation on why
FrancescAlted
committed
Added a new public blosc2.group_reduce() that is apt for NDArray instances
FrancescAlted
committed
Add forgotten test unit
FrancescAlted
committed
Implemented group-by convenience methods (sum, mean, min, max)
FrancescAlted
committed
Updated plan with current state
FrancescAlted
committed
Implemented persistent grouped output via `urlpath=`
FrancescAlted
committed
Protect tests when pyarrow is not installed
FrancescAlted
committed

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