Refactor build_columns
Refactor build_columns

klgilbert/ruby-bench-web,klgilbert/ruby-bench-web,ruby-bench/ruby-bench-web,bmarkons/ruby-bench-web,ruby-bench/ruby-bench-web,klgilbert/ruby-bench-web,ruby-bench/ruby-bench-web,bmarkons/ruby-bench-web,bmarkons/ruby-bench-web