presto-parquet/src/main/java/io/prestosql/parquet/reader/ListColumnReader.java/ListColumnReader/getNextCollectionStartIndex
class ListColumnReader:    private static int getNextCollectionStartIndex(int[] repetitionLevels, int maxRepetitionLevel, int elementIndex)
    {
        do {
            elementIndex++;
        }
        while (hasMoreElements(repetitionLevels, elementIndex) && !isCollectionBeginningMarker(repetitionLevels, maxRepetitionLevel, elementIndex));
        return elementIndex;
    }