Attempt to fix https://github.com/rails/arel/issues/438

oracle.rb

        if o.limit && o.offset
          o        = o.dup
          limit    = o.limit.expr
          offset   = o.offset
          o.offset = nil
          collector << "
              SELECT * FROM (
                SELECT raw_sql_.*, rownum raw_rnum_
                FROM ("

          collector = super(o, collector)

          collector << ") raw_sql_
                WHERE rownum <= ("

          collector = collector.add_bind(offset.expr) { |i|  ":a#{i}" }
          @limit_placeholder = nil
          collector << " + "
          collector = collector.add_bind(limit) { |i| @limit_placeholder = ":a#{i}" }
          collector << ")
            )
              WHERE "
          collector << "raw_rnum_ > #{@limit_placeholder}"
          return collector
        end