module Arel
  module Nodes
    class Binary
      attr_accessor :left, :right

      def initialize left, right
        @left  = left
        @right = right
      end

      def or right
        Nodes::Or.new self, right
      end

      # FIXME: this method should go away.  I don't like people calling
      # to_sql on non-head nodes.  This forces us to walk the AST until we
      # can find a node that has a "relation" member.
      #
      # Maybe we should just use `Table.engine`?  :'(
      def to_sql
        viz = Visitors::ToSql.new left.relation.engine
        viz.accept self
      end
    end
  end
end