Method isDigit

core/src/main/java/io/questdb/std/DecimalParser.java:300–302

Checks if a character is a decimal digit (0-9). @param c the character to check @return true if c is '0' through '9', false otherwise

(char c)

     * @return true if c is '0' through '9', false otherwise
     */
    private static boolean isDigit(char c) {
        return '0' <= c && c <= '9';
    }

    /**
     * Detects special floating-point values "NaN" and "Infinity" at the start of a CharSequence.