Check for duplicate output column names when merging
Check for duplicate output column names when merging

pllim/astropy,mhvk/astropy,saimn/astropy,saimn/astropy,joergdietrich/astropy,DougBurke/astropy,kelle/astropy,AustereCuriosity/astropy,mhvk/astropy,StuartLittlefair/astropy,joergdietrich/astropy,DougBurke/astropy,StuartLittlefair/astropy,tbabej/astropy,larrybradley/astropy,StuartLittlefair/astropy,StuartLittlefair/astropy,dhomeier/astropy,dhomeier/astropy,MSeifert04/astropy,kelle/astropy,mhvk/astropy,larrybradley/astropy,dhomeier/astropy,pllim/astropy,aleksandr-bakanov/astropy,tbabej/astropy,astropy/astropy,funbaker/astropy,astropy/astropy,pllim/astropy,larrybradley/astropy,lpsinger/astropy,pllim/astropy,aleksandr-bakanov/astropy,joergdietrich/astropy,aleksandr-bakanov/astropy,saimn/astropy,pllim/astropy,mhvk/astropy,joergdietrich/astropy,saimn/astropy,AustereCuriosity/astropy,kelle/astropy,astropy/astropy,mhvk/astropy,bsipocz/astropy,tbabej/astropy,dhomeier/astropy,bsipocz/astropy,joergdietrich/astropy,stargaser/astropy,AustereCuriosity/astropy,tbabej/astropy,stargaser/astropy,astropy/astropy,lpsinger/astropy,funbaker/astropy,DougBurke/astropy,aleksandr-bakanov/astropy,DougBurke/astropy,lpsinger/astropy,lpsinger/astropy,kelle/astropy,dhomeier/astropy,bsipocz/astropy,MSeifert04/astropy,AustereCuriosity/astropy,lpsinger/astropy,stargaser/astropy,MSeifert04/astropy,StuartLittlefair/astropy,bsipocz/astropy,saimn/astropy,funbaker/astropy,larrybradley/astropy,astropy/astropy,kelle/astropy,MSeifert04/astropy,stargaser/astropy,AustereCuriosity/astropy,tbabej/astropy,larrybradley/astropy,funbaker/astropy