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unhex(str) - Converts hexadecimal argument to binary
Performs the inverse operation of HEX(str). That is, it interprets
each pair of hexadecimal digits in the argument as a number and
converts it to the byte representation of the number. The
resulting characters are returned as a binary string.
Example:
> SELECT DECODE(UNHEX('4D7953514C'), 'UTF-8') from src limit 1;
'MySQL'
The characters in the argument string must be legal hexadecimal
digits: '0' .. '9', 'A' .. 'F', 'a' .. 'f'. If UNHEX() encounters
any nonhexadecimal digits in the argument, it returns NULL. Also,
if there are an odd number of characters a leading 0 is appended.
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