add a test to confirm alter table of pk column gets reflected
add a test to confirm alter table of pk column gets reflected

dstufft/sqlalchemy,olemis/sqlalchemy,EvaSDK/sqlalchemy,EvaSDK/sqlalchemy,olemis/sqlalchemy,pdufour/sqlalchemy,alex/sqlalchemy,pdufour/sqlalchemy,brianv0/sqlalchemy,inspirehep/sqlalchemy,itkovian/sqlalchemy,brianv0/sqlalchemy,epa/sqlalchemy,sandan/sqlalchemy,wfxiang08/sqlalchemy,elelianghh/sqlalchemy,halfcrazy/sqlalchemy,alex/sqlalchemy,Cito/sqlalchemy,itkovian/sqlalchemy,bdupharm/sqlalchemy,bdupharm/sqlalchemy,WinterNis/sqlalchemy,davidjb/sqlalchemy,Akrog/sqlalchemy,monetate/sqlalchemy,ThiefMaster/sqlalchemy,sandan/sqlalchemy,276361270/sqlalchemy,alex/sqlalchemy,elelianghh/sqlalchemy,inspirehep/sqlalchemy,graingert/sqlalchemy,Cito/sqlalchemy,halfcrazy/sqlalchemy,epa/sqlalchemy,Cito/sqlalchemy,davidfraser/sqlalchemy,hsum/sqlalchemy,bootandy/sqlalchemy,wujuguang/sqlalchemy,wujuguang/sqlalchemy,davidjb/sqlalchemy,Akrog/sqlalchemy,robin900/sqlalchemy,j5int/sqlalchemy,276361270/sqlalchemy,wfxiang08/sqlalchemy,sqlalchemy/sqlalchemy,dstufft/sqlalchemy,ThiefMaster/sqlalchemy,hsum/sqlalchemy,zzzeek/sqlalchemy,monetate/sqlalchemy,j5int/sqlalchemy,robin900/sqlalchemy,bootandy/sqlalchemy,graingert/sqlalchemy,WinterNis/sqlalchemy,davidfraser/sqlalchemy