lib. Otherwise, the return value is always NULL.\n\nURL: https://dev.mysql.com/doc/refman/8.0/en/encryption-functions.html\n\n','mysql> SELECT UNCOMPRESS(COMPRESS(\'any string\'));\n        -> \'any string\'\nmysql> SELECT UNCOMPRESS(\'any string\');\n        -> NULL\n','https://dev.mysql.com/doc/refman/8.0/en/encryption-functions.html');