writeField
fun writeField(metaOut: IndexOutput, indexOut: IndexOutput, dataOut: IndexOutput, fieldName: String, reader: MutablePointTree): IORunnable?
Write a field from a MutablePointTree. This way of writing points is faster than regular writes with BKDWriter.add since there is opportunity for reordering points before writing them to disk. This method does not use transient disk in order to reorder points.