build_select

# File activerecord/lib/active_record/relation/query_methods.rb, line 223
    def build_select(arel, selects)
      unless selects.empty?
        @implicit_readonly = false
        # TODO: fix this ugly hack, we should refactor the callers to get an ARel compatible array.
        # Before this change we were passing to ARel the last element only, and ARel is capable of handling an array
        if selects.all? {|s| s.is_a?(String) || !s.is_a?(Arel::Expression) } && !(selects.last =~ /^COUNT\(/)
          arel.project(*selects)
        else
          arel.project(selects.last)
        end
      else
        arel.project(Arel::SqlLiteral.new(@klass.quoted_table_name + '.*'))
      end
    end