Allow resolve_column_type to use const (#350)
Allow resolve_column_type to use const (#350)

* Allow resolve_column_type to use const

* Fix formatting/lint

* try gcc7

* remove is_const_v which gcc-6 does not seem to like

* It doesn't like is_base_of_v either...

* Address review

hyrise/hyrise,hyrise/hyrise,hyrise/hyrise