Is Levenshtein slow in MySQL? was originally asked August 9, and received answers. A month later, the OP completely changed the question, invalidating the existing answers. I rolled it back, and left a comment to say that a new question should be opened, but the OP changed it back saying "There is no rule about it, so you can't edit my post."
There is also a bounty on this question, making things more interesting.
What are the guidelines on completely changing a question or rolling back changed questions? Was I out-of-line rolling back the question?
I have no desire to get into an edit war, so I'm not going to touch the question again. If a moderator wants to get involved, great.