allow specifying a typed schema

[cvogt]

Assuming your data follows a rigid schema, it would be great to allow Quark code to be type checked against it. E.g. something like

trait Schema{
  def country: Field[String]
  def age: Field[Int]
}

import quasar.quark._

object Example {
  def main(args: Array[String]): Unit = {
    val dataset = Dataset.loadTypedAs[Schema]("/prod/profiles")

    val averageAge = dataset.groupBy(_.country).map(_.age).reduceBy(_.average)

    val stream = averageAge.evalTo("/prod/profiles_2")
  }
}

Quark puts Quasar into similar territory with Slick and Quill. Maybe there are things to learn.