r0 := UnboundTable: alltypes
  a int8
  b int16
  c int32
  d int64
  e float32
  f float64
  g string
  h boolean
  i timestamp
  j date
  k time

Aggregate[r0]
  groups:
    key1: r0.g
    key2: Round(r0.f)
  metrics:
    c: Sum(r0.c)
    d: Mean(r0.d)