avro4s_optional_utf8.scala

import com.sksamuel.avro4s.{AvroSchema, SchemaFor}
import org.apache.avro.Schema
import org.apache.avro.util.Utf8

case class MyClass(id: Utf8, name: Utf8, familyName: Option[Utf8])

object Main extends App {
  implicit object Utf8Schema extends SchemaFor[Utf8] {
    override def schema: Schema = Schema.create(Schema.Type.STRING)
  }

  implicit object OptionUtf8Schema extends SchemaFor[Option[Utf8]] {
    override def schema: Schema = Schema.createUnion(Schema.create(Schema.Type.NULL), Schema.create(Schema.Type.STRING))
  }

  val schema = AvroSchema[MyClass]
  println(schema)
}