Get column type from COLUMN_TYPE instead of DATA_TYPE
Get column type from COLUMN_TYPE instead of DATA_TYPE

Addresses:
https://groups.google.com/d/msg/yesodweb/M1hGNedIvng/5EVWd5U36wUJ

superduper/persistent,gbwey/persistent,pseudonom/persistent,nakaji-dayo/persistent,nakaji-dayo/persistent,mkscrg/persistent,jasonzoladz/persistent,andrewthad/persistent,jcristovao/persistent,paul-rouse/persistent,psibi/persistent,junjihashimoto/persistent,mitchellwrosen/persistent,creichert/persistent,meteficha/persistent,andrewthad/persistent,jasonzoladz/persistent,mkscrg/persistent,andrewthad/persistent,plow-technologies/persistent,junjihashimoto/persistent,greydot/persistent,greydot/persistent,gbwey/persistent,nakaji-dayo/persistent,jcristovao/persistent,jcristovao/persistent,mkscrg/persistent,superduper/persistent,pseudonom/persistent,bitemyapp/persistent,mitchellwrosen/persistent,meteficha/persistent,greydot/persistent,superduper/persistent,rdnetto/persistent,jasonzoladz/persistent,meteficha/persistent,gbwey/persistent,rdnetto/persistent,erikd/persistent,mitchellwrosen/persistent,naushadh/persistent,yesodweb/persistent