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