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Aggregate Transform
Use aggregate to collapse rows into summary values. Group with by to get per-group results.
Whole-Table Aggregation
$ Whole-Table Aggregation
Without by, the entire table collapses to a single row.
Group By
$ Group By
Add by { column } to get one row per group.
Multiple Groups
$ Multiple Groups
Group by multiple columns to get finer-grained breakdowns.
Multiple Aggregations
$ Multiple Aggregations
Compute several aggregates in a single pass. Available aggregate functions include math::sum, math::avg, math::min, and math::max.