### Changed

* output/mysql: enhanced fetch_rows handling.
  If fetch_rows > 1, set useCursorFetch=true which enables server-side
  prepared statements. It fetches rows by chunks.
  If fetch_rows = 1, set Integer.MIN_VALUE to Statement.setFetchSize. It
  fetches rows one by one.
  If fetch_rows < 0, don't set anything. It fetches all rows at once
  to memory.