references_eager_loaded_tables?

# File activerecord/lib/active_record/relation.rb, line 835
      def references_eager_loaded_tables?
        joined_tables = arel.join_sources.map do |join|
          if join.is_a?(Arel::Nodes::StringJoin)
            tables_in_string(join.left)
          else
            [join.left.table_name, join.left.table_alias]
          end
        end

        joined_tables += [table.name, table.table_alias]

        # always convert table names to downcase as in Oracle quoted table names are in uppercase
        joined_tables = joined_tables.flatten.compact.map(&:downcase).uniq

        (references_values - joined_tables).any?
      end