order_hacks

# File activerecord/lib/arel/visitors/oracle.rb, line 104
        def order_hacks(o)
          return o if o.orders.empty?
          return o unless o.cores.any? do |core|
            core.projections.any? do |projection|
              /FIRST_VALUE/ === projection
            end
          end
          # Previous version with join and split broke ORDER BY clause
          # if it contained functions with several arguments (separated by ',').
          #
          # orders   = o.orders.map { |x| visit x }.join(', ').split(',')
          orders   = o.orders.map do |x|
            string = visit(x, Arel::Collectors::SQLString.new).value
            if string.include?(",")
              split_order_string(string)
            else
              string
            end
          end.flatten
          o.orders = []
          orders.each_with_index do |order, i|
            o.orders <<
              Nodes::SqlLiteral.new("alias_#{i}__#{' DESC' if /\bdesc$/i === order}")
          end
          o
        end