presto-orc/src/main/java/io/prestosql/orc/writer/StructColumnWriter.java/StructColumnWriter/createStructColumnPositionList
class StructColumnWriter:    private static List<Integer> createStructColumnPositionList(
            boolean compressed,
            Optional<BooleanStreamCheckpoint> presentCheckpoint)
    {
        ImmutableList.Builder<Integer> positionList = ImmutableList.builder();
        presentCheckpoint.ifPresent(booleanStreamCheckpoint -> positionList.addAll(booleanStreamCheckpoint.toPositionList(compressed)));
        return positionList.build();
    }