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| case class FlightDetails(year: Int, month: Int, day_of_month: Int, airline_Id: Int, origin: String, dest: Int, delay: Double) | |
| val ds = df.as[FlightDetails] | |
| def averageDelay = typedAvg[FlightDetails](_.delay) | |
| .name("average_delay") | |
| val resultDS = ds.filter(_.delay > 0) | |
| .groupByKey(x => (x.origin, x.dest) ) | |
| .agg(averageDelay) | |
| .sort($"average_delay".desc) |
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