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Grouping
aq.from(cars)
.groupby("Origin")
.rollup({
meanHP: record => op.mean(record.Horsepower),
meanMPG: record => op.mean(record.Miles_per_Gallon),
maxCylinders: record => op.max(record.Cylinders),
minCylinders: record => op.min(record.Cylinders),
count: record => op.count()
})
.view()
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