presto-orc/src/main/java/io/prestosql/orc/reader/StructColumnReader.java/StructColumnReader/close
class StructColumnReader:    @Override
    public void close()
    {
        try (Closer closer = Closer.create()) {
            for (ColumnReader structField : structFields.values()) {
                closer.register(structField::close);
            }
        }
        catch (IOException e) {
            throw new UncheckedIOException(e);
        }
    }