presto-parquet/src/main/java/io/prestosql/parquet/reader/ListColumnReader.java/ListColumnReader/isCollectionBeginningMarker
class ListColumnReader:    private static boolean isCollectionBeginningMarker(int[] repetitionLevels, int maxRepetitionLevel, int nextIndex)
    {
        return repetitionLevels[nextIndex] < maxRepetitionLevel;
    }