presto-rcfile/src/main/java/io/prestosql/rcfile/text/BooleanEncoding.java/BooleanEncoding/isFalse
class BooleanEncoding:    @SuppressWarnings("PointlessArithmeticExpression")
    private static boolean isFalse(Slice slice, int start, int length)
    {
        return (length == 5) &&
                (toUpperCase(slice.getByte(start + 0)) == 'F') &&
                (toUpperCase(slice.getByte(start + 1)) == 'A') &&
                (toUpperCase(slice.getByte(start + 2)) == 'L') &&
                (toUpperCase(slice.getByte(start + 3)) == 'S') &&
                (toUpperCase(slice.getByte(start + 4)) == 'E');
    }