exec_main_query

# File activerecord/lib/active_record/relation.rb, line 975
      def exec_main_query(async: false)
        if @none
          if async
            return FutureResult::Complete.new([])
          else
            return []
          end
        end

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