Tatsuo,
Thank you for your response, I have followed the discussion on Hackers with
interest. I hope that your efforts are a great success! In my case, I need
to find a solution available in shipping versions of Postgres. But, since
you've joined in, I'm curious: What is the advantage of a materialized view
over a real table? It seems like the update semantics and mechanics are
more straightforward with a table.