references_eager_loaded_tables?() private

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# File activerecord/lib/active_record/relation.rb, line 465
    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 { |t| t.downcase }.uniq

      (tables_in_string(to_sql) - joined_tables).any?
    end
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