Split-Apply-Combine Aggregation
groupby partitions rows by key, applies an aggregation, transformation, or filter to each partition independently, and recombines the results into a single structure. The distinction matters: agg reduces each group to one row, transform returns a like-indexed result for broadcasting back, and apply is the slow escape hatch.
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groupby partitions rows by key, applies an aggregation, transformation, or filter to each partition independently, and recombines the results into a single structure. The distinction matters: agg reduces each group to one row, transform returns a like-indexed result for broadcasting back, and apply is the slow escape hatch.
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