Corrected problem with index too large on mysql.
Corrected problem with index too large on mysql.

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