presto-orc/src/main/java/io/prestosql/orc/reader/ReaderUtils.java/ReaderUtils/unpackLengthNulls
class ReaderUtils:    public static void unpackLengthNulls(int[] values, boolean[] isNull, int nonNullCount)
    {
        int nullSuppressedPosition = nonNullCount - 1;
        for (int outputPosition = isNull.length - 1; outputPosition >= 0; outputPosition--) {
            if (isNull[outputPosition]) {
                values[outputPosition] = 0;
            }
            else {
                values[outputPosition] = values[nullSuppressedPosition];
                nullSuppressedPosition--;
            }
        }
    }