R1:54470a12d430

Execute fulltext queries using a subquery instead of by ordering the entire result set

Summary:
Ref T6740. Currently, we issue fulltext queries with an "ORDER BY <score>" on the entire result set.

For very large result sets, this can require MySQL to do a lot of work. However, this work is generally useless: if you search for some common word like "diff" or "internet" or whatever and match 4,000 documents, the chance that we can score whatever thing you were thinking of at the top of the result set is…