1-written.scala

case class Supplier(id: Int, name: String, street: String, city: String, state: String, zip: String)

object ExampleDatastore extends H2Datastore(mode = H2Memory("example"), columnNameAdapter = SnakeUpperCaseAdapter) {
  object suppliers extends Table("SUPPLIERS", classOf[Supplier])
}

2-expanded.scala

case class Supplier(id: Int, name: String, street: String, city: String, state: String, zip: String)

object ExampleDatastore extends H2Datastore(mode = H2Memory("example"), columnNameAdapter = SnakeUpperCaseAdapter) {
  object suppliers extends Table("SUPPLIERS") {
    val id = column[Int]("ID", PrimaryKey)
    val name = column[String]("NAME")
    val street = column[String]("STREET")
    val city = column[String]("CITY")
    val state = column[String]("STATE")
    val zip = column[String]("ZIP")
  }
}

3-written.forced.column.names.scala

case class Supplier(id: Int, name: String, street: String, city: String, state: String, zip: String)

object ExampleDatastore extends H2Datastore(mode = H2Memory("example"), columnNameAdapter = SnakeUpperCaseAdapter) {
  object suppliers extends Table("SUPPLIERS", classOf[Supplier]) {
    val id = column[Int]("SUP_ID", PrimaryKey)
    val name = column[String]("SUP_NAME")
  }
}

4-written.forced.column.names.expanded.scala

case class Supplier(id: Int, name: String, street: String, city: String, state: String, zip: String)

object ExampleDatastore extends H2Datastore(mode = H2Memory("example"), columnNameAdapter = SnakeUpperCaseAdapter) {
  object suppliers extends Table("SUPPLIERS", classOf[Supplier]) {
    val id = column[Int]("SUP_ID", PrimaryKey)
    val name = column[String]("SUP_NAME")
    val street = column[String]("STREET")
    val city = column[String]("CITY")
    val state = column[String]("STATE")
    val zip = column[String]("ZIP")
  }
}

Alternatively, add annotations to the case class fields for special column names