500, 1000 lines sqlite ../../data/sqlite/world.sqlite true (SELECT *, 'zhao-saalfeld' as algorithm, 1 as simplify, -375 as ty FROM world_merc UNION ALL SELECT *, 'zhao-saalfeld' as algorithm, 2 as simplify, -125 as ty FROM world_merc UNION ALL SELECT *, 'zhao-saalfeld' as algorithm, 4 as simplify, 125 as ty FROM world_merc UNION ALL SELECT *, 'zhao-saalfeld' as algorithm, 10 as simplify, 375 as ty FROM world_merc)