presto-hive/src/main/java/io/prestosql/plugin/hive/HivePageSourceProvider.java/HivePageSourceProvider/regular
class HivePageSourceProvider:        public static ColumnMapping regular(HiveColumnHandle hiveColumnHandle, int index, Optional<HiveType> coerceFrom)
        {
            checkArgument(hiveColumnHandle.getColumnType() == REGULAR);
            return new ColumnMapping(ColumnMappingKind.REGULAR, hiveColumnHandle, Optional.empty(), OptionalInt.of(index), coerceFrom);
        }