[ci skip] Merge pull request #5183 from ytetsuro/add_oci8_driver_write_type
[ci skip] Merge pull request #5183 from ytetsuro/add_oci8_driver_write_type

add is_write_type method for merge query
smallp/CodeIgniter,ytetsuro/CodeIgniter,madwings/InsaneDB,poing/CodeIgniter,Tpojka/CodeIgniter,butane/CodeIgniter,kamaslau/BasicCodeIgniter,HindrikDeelstra/codeigniter-snackapp,ytetsuro/CodeIgniter,Bluewind/filebin,Tpojka/CodeIgniter,KmServer/CodeIgniter,butane/CodeIgniter,madwings/InsaneDB,Tpojka/CodeIgniter,madwings/InsaneDB,jim-parry/CodeIgniter,ganiutomo/CodeIgniter,ytetsuro/CodeIgniter,smallp/CodeIgniter,ganiutomo/CodeIgniter,kamaslau/BasicCodeIgniter,bcit-ci/CodeIgniter,bcit-ci/CodeIgniter,bcit-ci/CodeIgniter,ganiutomo/CodeIgniter,it-can/CodeIgniter,KmServer/CodeIgniter,tianhe1986/CodeIgniter,jim-parry/CodeIgniter,it-can/CodeIgniter,butane/CodeIgniter,asmdigital/CodeIgniter,kamaslau/BasicCodeIgniter,asmdigital/CodeIgniter,tianhe1986/CodeIgniter,ganiutomo/CodeIgniter,KmServer/CodeIgniter,Bluewind/filebin,Bluewind/filebin,poing/CodeIgniter,madwings/InsaneDB,asmdigital/CodeIgniter,asmdigital/CodeIgniter,bcit-ci/CodeIgniter,butane/CodeIgniter,ytetsuro/CodeIgniter,jim-parry/CodeIgniter,kamaslau/BasicCodeIgniter,Tpojka/CodeIgniter,ganiutomo/CodeIgniter,Bluewind/filebin,Tpojka/CodeIgniter,it-can/CodeIgniter,asmdigital/CodeIgniter,jim-parry/CodeIgniter,bcit-ci/CodeIgniter,tianhe1986/CodeIgniter,poing/CodeIgniter,HindrikDeelstra/codeigniter-snackapp,tianhe1986/CodeIgniter,poing/CodeIgniter,jim-parry/CodeIgniter,HindrikDeelstra/codeigniter-snackapp,poing/CodeIgniter,madwings/InsaneDB,KmServer/CodeIgniter,tianhe1986/CodeIgniter,it-can/CodeIgniter,HindrikDeelstra/codeigniter-snackapp,it-can/CodeIgniter,ytetsuro/CodeIgniter,HindrikDeelstra/codeigniter-snackapp,butane/CodeIgniter,Bluewind/filebin