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Deriving Spark DataFrame schemas from case classes

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- not supported by Spark: ```scala sealed trait A final case class B(b: Int) extends A final case class C(c: String) extends A spark.createDataset(Seq(B(1), C("c"))) // java.lang.NoClassDefFoundError: no Java class...

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## About this PR 📦 Updates [org.scalatest:scalatest](https://github.com/scalatest/scalatest) from `3.2.11` to `3.2.19` ## Usage ✅ **Please merge!** I'll automatically update this PR to resolve conflicts as long as you don't change...

## About this PR 📦 Updates [com.chuusai:shapeless](https://github.com/milessabin/shapeless) from `2.3.8` to `2.3.12` 📜 [GitHub Release Notes](https://github.com/milessabin/shapeless/releases/tag/v2.3.12) - [Version Diff](https://github.com/milessabin/shapeless/compare/v2.3.8...v2.3.12) ## Usage ✅ **Please merge!** I'll automatically update this PR to resolve...

## About this PR 📦 Updates [org.scala-lang:scala-library](https://github.com/scala/scala) from `2.13.8` to `2.13.14` 📜 [GitHub Release Notes](https://github.com/scala/scala/releases/tag/v2.13.14) - [Version Diff](https://github.com/scala/scala/compare/v2.13.8...v2.13.14) ## Usage ✅ **Please merge!** I'll automatically update this PR to resolve...