module Arel
  module Visitors
    class PostgreSQL < Arel::Visitors::ToSql
      private
      def visit_Arel_Nodes_Lock o
        visit o.expr
      end

      def visit_Arel_Nodes_Matches o
        "#{visit o.left} ILIKE #{visit o.right}"
      end

      def visit_Arel_Nodes_DoesNotMatch o
        "#{visit o.left} NOT ILIKE #{visit o.right}"
      end

      def visit_Arel_Nodes_DistinctOn o
        "DISTINCT ON ( #{visit o.expr} )"
      end
    end
  end
end