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Converts a hexadecimal string to a character string.

func.unhex(<hex_str>)
func.unhex('48656C6C6F')
┌─────────┐
'Hello'
└─────────┘
UNHEX(<hex_str>)
SELECT UNHEX('48656C6C6F');
┌───────┐
│ Hello │
└───────┘