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• 0.17.0
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• CatalystAverageable.scala

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frameless.CatalystAverageable.scala Maven / Gradle / Ivy

package frameless

import scala.annotation.implicitNotFound

/**
  * When averaging Spark doesn't change these types:
  * - BigDecimal -> BigDecimal
  * - Double     -> Double
  * But it changes these types :
  * - Int        -> Double
  * - Short      -> Double
  * - Long       -> Double
  */
@implicitNotFound("Cannot compute average of type ${In}.")
trait CatalystAverageable[In, Out]

object CatalystAverageable {
  private[this] val theInstance = new CatalystAverageable[Any, Any] {}
  private[this] def of[In, Out]: CatalystAverageable[In, Out] = theInstance.asInstanceOf[CatalystAverageable[In, Out]]

  implicit val framelessAverageableBigDecimal: CatalystAverageable[BigDecimal, BigDecimal] = of[BigDecimal, BigDecimal]
  implicit val framelessAverageableDouble:     CatalystAverageable[Double, Double]         = of[Double, Double]
  implicit val framelessAverageableLong:       CatalystAverageable[Long, Double]           = of[Long, Double]
  implicit val framelessAverageableInt:        CatalystAverageable[Int, Double]            = of[Int, Double]
  implicit val framelessAverageableShort:      CatalystAverageable[Short, Double]          = of[Short, Double]
}