1. BigBenches

let ms = '1trc/measurements-0.parquet'
dfr open $ms
| dfr group-by  station
| dfr agg [
  (dfr col measure | dfr min | dfr as "min")
  (dfr col measure | dfr max | dfr as "max")
  (dfr col measure | dfr sum | dfr as "sum")
  (dfr col measure | dfr count | dfr as "count")
]