PolymorphicVectors2.scala

private val allocator: BufferAllocator = new RootAllocator()

private val schema: Schema =
  new Schema(List(
    new Field("id", new FieldType(false, new ArrowType.Int(32, true), null), null),
    new Field("username", new FieldType(false, new ArrowType.Utf8(), null), null),
    new Field("pro", new FieldType(false, new ArrowType.Bool(), null), null)
  ).asJava)

private val vectorSchemaRoot = VectorSchemaRoot.create(schema, allocator)

val id       = vectorSchemaRoot.getVector("id").asInstanceOf[IntVector]
val username = vectorSchemaRoot.getVector("username").asInstanceOf[VarCharVector]
val pro      = vectorSchemaRoot.getVector("pro").asInstanceOf[BitVector]

val ls      = List(1000, "iamsmkr", true)
val vectors = List(id, username, pro)

ls.zip(vectors).map { (value, vector) =>
  vector.allocateNew()
  vector.setSafe(0, value)
  vector.setValueCount(1)
  vector.get(0)
}

// Returned is the list of values as a validation of value vectors being set correctly