If it was me I'd just copy the pg_dump way of doing things...

To the extent possible, I'd like to preserve the exact functionality
(or lack thereof) of previous versions.  Would this be possible that
way?

Don't see it'd be too hard.  All pg_dump basically does is this:

if (version <= 7.3) {
  query = "..";
else if (version == 7.4) {
  query = "..";
else
  query = "..";

Other than that you might need some smarts in the output table display logic so that it doesn't "assume" what columns are available from the queries.

Or something.

Chris


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