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") ]