presto-orc/src/main/java/io/prestosql/orc/checkpoint/Checkpoints.java/Checkpoints/ColumnPositionsList
class Checkpoints:        private ColumnPositionsList(OrcColumnId columnId, OrcTypeKind columnType, List<Integer> positionsList)
        {
            this.columnId = requireNonNull(columnId, "columnId is null");
            this.columnType = requireNonNull(columnType, "columnType is null");
            this.positionsList = ImmutableList.copyOf(requireNonNull(positionsList, "positionsList is null"));
        }