build_handler

# File activerecord/lib/active_record/query_logs.rb, line 180
        def build_handler(name, handler = nil)
          handler ||= @taggings[name]
          if handler.nil?
            GetKeyHandler.new(name)
          elsif handler.respond_to?(:call)
            if handler.arity == 0
              ZeroArityHandler.new(handler)
            else
              handler
            end
          else
            IdentityHandler.new(handler)
          end
        end