presto-orc/src/main/java/io/prestosql/orc/writer/StructColumnWriter.java/StructColumnWriter/StructColumnWriter
class StructColumnWriter:    public StructColumnWriter(OrcColumnId columnId, CompressionKind compression, int bufferSize, List<ColumnWriter> structFields)
    {
        this.columnId = columnId;
        this.compressed = requireNonNull(compression, "compression is null") != NONE;
        this.structFields = ImmutableList.copyOf(requireNonNull(structFields, "structFields is null"));
        this.presentStream = new PresentOutputStream(compression, bufferSize);
    }