presto-hive/src/main/java/io/prestosql/plugin/hive/HiveBooleanParser.java/HiveBooleanParser/isFalse
class HiveBooleanParser:    @SuppressWarnings("PointlessArithmeticExpression")
    public static boolean isFalse(byte[] bytes, int start, int length)
    {
        return (length == 5) &&
                (toUpperCase(bytes[start + 0]) == 'F') &&
                (toUpperCase(bytes[start + 1]) == 'A') &&
                (toUpperCase(bytes[start + 2]) == 'L') &&
                (toUpperCase(bytes[start + 3]) == 'S') &&
                (toUpperCase(bytes[start + 4]) == 'E');
    }