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Improve groupby's agg performance on large data; from 16s to 20ms for 20k rows #677

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TheSisb wants to merge 1 commit into from

improve groupBy and agg perf by a factor of 10

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Improve groupby's agg performance on large data; from 16s to 20ms for 20k rows #677

improve groupBy and agg perf by a factor of 10
bd93995
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test (18.x)
succeeded Sep 27, 2025 in 3m 13s