500, 1000 lines sqlite ../../data/sqlite/world.sqlite true (SELECT *, 'visvalingam-whyatt' as algorithm, 10 as simplify, -375 as ty FROM world_merc UNION ALL SELECT *, 'visvalingam-whyatt' as algorithm, 20 as simplify, -125 as ty FROM world_merc UNION ALL SELECT *, 'visvalingam-whyatt' as algorithm, 40 as simplify, 125 as ty FROM world_merc UNION ALL SELECT *, 'visvalingam-whyatt' as algorithm, 80 as simplify, 375 as ty FROM world_merc)