select utl_raw.cast_to_raw('tom is boy') from dual;
select utl_raw.cast_to_raw('tom is boy') from d
阅读背景：
处理大字段时遇到问题:UTL_RAW.CAST_TO_RAW 提示 ora-06553: pls-306 "wrong number or types of arguments in call to ，请高人指点1，
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