presto-parquet/src/main/java/io/prestosql/parquet/reader/PrimitiveColumnReader.java/PrimitiveColumnReader/buildLevelRLEReader
class PrimitiveColumnReader:    private LevelReader buildLevelRLEReader(int maxLevel, Slice slice)
    {
        if (maxLevel == 0) {
            return new LevelNullReader();
        }
        return new LevelRLEReader(new RunLengthBitPackingHybridDecoder(BytesUtils.getWidthFromMaxInt(maxLevel), new ByteArrayInputStream(slice.getBytes())));
    }