为什么这个MySQL双元电话功能不能正常工作？

I am just learning about the Metaphone and Double Metaphone search algorithms, and I have a few questions. Per the Metaphone Wiki page, I found a couple sources with implementations, a MySQL implementation in particular. I wanted to test it out with a test database of mine so I first imported the metaphone.sql file (containing the double metaphone function) found I am just learning about the Metaphone and Doub