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