尝试使用它，我在一段时间前发现它，可以将其转换为char，而不是Varchar2或Varchar，没有测试一下.试试:

try using this, I found it some time ago, you can convert it to char, not to Varchar2 or Varchar, haven't test it yet. Try:

CAST(a.ar_options AS CHAR(10000) CHARACTER SET utf8)

MySQL对待数据的唯一性.因此，Blob和Text之间存在差异.文本只是表示以原始形式存储的文本字符串，而不是以二进制形式存储，而blob是以二进制形式存储的文本字符串.

MySQL treat data unique. Hence there is a difference between Blob and Text. Text simply means a text string stored as original, not in binary, whereas a blob is a text string stored as a binary.