Separator.rb

  module Arel
    module Nodes
      const_set 'Separator', Class.new(Binary)
    end

    module Visitors
      class ToSql < ::Arel::Visitors::Reduce
        def visit_Arel_Nodes_Separator o, collector
          collector = visit o.left, collector
          collector << " SEPARATOR "
          visit o.right, collector
        end
      end
    end
  end