Corrects dd_factor_ rename error in compiler
Corrects dd_factor_ rename error in compiler

introduced in b78ee3c064f72a0cfec3a5fa70a014847d6f899b

HazyResearch/deepdive,sky-xu/deepdive,HazyResearch/deepdive,HazyResearch/deepdive,sky-xu/deepdive,shahin/deepdive,shahin/deepdive,HazyResearch/deepdive