remove unnecessary method overrides in DB2
remove unnecessary method overrides in DB2

DHager/dbal,kupishkis/dbal,arima-ryunosuke/dbal,janschoenherr/dbal,LionwareSolutions/dbal,webonyx/dbal,vortgo/dbal,mariuz/dbal,mihai-stancu/dbal,janschoenherr/dbal,vortgo/dbal,doctrine/dbal,mikeSimonson/dbal,mariuz/dbal,v-bartusevicius/dbal,tk-s/dbal,wuxu92/dbal,AlexDpy/dbal,helicon-os/doctrine-dbal,DHager/dbal,gencer/dbal,cassvail/dbal,mariuz/dbal,webonyx/dbal,PowerKiKi/dbal,mRoca/dbal,vutung2311/dbal,LionwareSolutions/dbal,sarcher/dbal,kimhemsoe/dbal,tk-s/dbal,PowerKiKi/dbal,bspeterson/dbal,kupishkis/dbal,gencer/dbal,deeky666/dbal,vutung2311/dbal,Tobion/dbal,mihai-stancu/doctrine-dbal,mRoca/dbal,doctrine/dbal,deeky666/dbal,stof/dbal,shivergard/dbal,lcobucci/dbal,v-bartusevicius/dbal,zeroedin-bill/dbal,AlexDpy/dbal,easybiblabs/dbal,sarcher/dbal,adrienbrault/dbal,mathroc/dbal,stchr/dbal,BenMorel/dbal,lafourchette/dbal,easybiblabs/dbal,drieschel/dbal,adrienbrault/dbal,shivergard/dbal,cassvail/dbal,wuxu92/dbal,kimhemsoe/dbal,helicon-os/doctrine-dbal,mathroc/dbal,zeroedin-bill/dbal,lcobucci/dbal,nfrignani/dbal,mbeccati/dbal,stof/dbal,kupishkis/dbal,LionwareSolutions/dbal,bspeterson/dbal,webonyx/dbal,PowerKiKi/dbal,easybiblabs/dbal,arima-ryunosuke/dbal,nfrignani/dbal,Tobion/dbal,adrienbrault/dbal,lafourchette/dbal,stchr/dbal,drieschel/dbal,sarcher/dbal,BenMorel/dbal,mbeccati/dbal,mihai-stancu/dbal,hason/dbal,mihai-stancu/doctrine-dbal,arima-ryunosuke/dbal,hason/dbal,mikeSimonson/dbal,hason/dbal