FieldSortDescriptor
data class FieldSortDescriptor(val paged: Boolean, val cursor: Boolean, val indexed: Boolean? = null)
Whether the field orders a paged query and a cursor. indexed is the storage's fact that an index backs the field's sort (me.ahoo.wow.query.schema.QueryFieldBinding.indexed): false marks a sort the storage runs without one, which may be slow on a large model; null when the storage does not say.