Comment by mrigger

Yes, you are right, the results are not comparable between DBMS that we tested. For MySQL, the large number of existing bugs prevented us from going further, and also testing more advanced functionality (like FTS). For SQLite (and DuckDB), bugs were typically fixed within hours, which is why we could comprehensively test them. For SQLite, we also tested three extensions (besides FTS, also R*Tree and DBSTAT).