DatasetTable
class DatasetTable @InternalWowApi constructor(val name: String, val columns: List<DatasetColumn>, val rows: List<Map<String, Any?>>)
A table the spec loads: its columns and rows, each value a String, Long, BigDecimal, Instant, a List of strings or null as its column's type says. A row without a column's key leaves the value missing; a table stores it as its storage stores a missing value (NULL, or an empty array).