add NATURAL JOIN types to fix #5240
add NATURAL JOIN types to fix #5240

madwings/InsaneDB,bcit-ci/CodeIgniter,madwings/InsaneDB,jim-parry/CodeIgniter,smallp/CodeIgniter,poing/CodeIgniter,Tpojka/CodeIgniter,jim-parry/CodeIgniter,asmdigital/CodeIgniter,asmdigital/CodeIgniter,poing/CodeIgniter,butane/CodeIgniter,kamaslau/BasicCodeIgniter,madwings/InsaneDB,butane/CodeIgniter,kamaslau/BasicCodeIgniter,ganiutomo/CodeIgniter,ytetsuro/CodeIgniter,ytetsuro/CodeIgniter,jim-parry/CodeIgniter,poing/CodeIgniter,madwings/InsaneDB,poing/CodeIgniter,tianhe1986/CodeIgniter,tianhe1986/CodeIgniter,smallp/CodeIgniter,madwings/InsaneDB,butane/CodeIgniter,ganiutomo/CodeIgniter,ganiutomo/CodeIgniter,ytetsuro/CodeIgniter,bcit-ci/CodeIgniter,tianhe1986/CodeIgniter,poing/CodeIgniter,Tpojka/CodeIgniter,tianhe1986/CodeIgniter,kamaslau/BasicCodeIgniter,butane/CodeIgniter,ytetsuro/CodeIgniter,bcit-ci/CodeIgniter,bcit-ci/CodeIgniter,asmdigital/CodeIgniter,asmdigital/CodeIgniter,ytetsuro/CodeIgniter,ganiutomo/CodeIgniter,bcit-ci/CodeIgniter,jim-parry/CodeIgniter,Tpojka/CodeIgniter,ganiutomo/CodeIgniter,tianhe1986/CodeIgniter,kamaslau/BasicCodeIgniter,butane/CodeIgniter,Tpojka/CodeIgniter,jim-parry/CodeIgniter,Tpojka/CodeIgniter,asmdigital/CodeIgniter