do you have a lot of datasheet views and so on? Metadata will be cached without the-A parameter, but it will be slow to load when there is too much metadata. Caching these metadata can complete the code automatically, that is, when you press the TAB key to complete the code. With the addition of the-A parameter, there is no longer a completion function. If you don't care, or the loading time is tolerable, just ignore the prompt.

first of all, this is not an error message, there is no need to struggle, or explain the reason, think of other ways?
secondly, if you want to avoid this information, MySQL explicitly tells you that the solution is to add-A, but you have to find another way;
finally, you can deceive yourself by adding the no-auto-rehash parameter under [client] of my.cnf, so you don't have to add-An every time.