exec_main_query

# File activerecord/lib/active_record/relation.rb, line 1415
      def exec_main_query(async: false)
        if @none
          if async
            return FutureResult.wrap([])
          else
            return []
          end
        end

        skip_query_cache_if_necessary do
          if where_clause.contradiction?
            [].freeze
          elsif eager_loading?
            klass.with_connection do |c|
              apply_join_dependency do |relation, join_dependency|
                if relation.null_relation?
                  [].freeze
                else
                  relation = join_dependency.apply_column_aliases(relation)
                  @_join_dependency = join_dependency
                  c.select_all(relation.arel, "SQL", async: async)
                end
              end
            end
          else
            klass.with_connection do |c|
              klass._query_by_sql(c, arel, async: async)
            end
          end
        end
      end