On July 22, 2015 at 12:15:14 PM, Andres Freund (and...@anarazel.de) wrote: It doesn't seem that unlikely that somebody does an ALTER SERVER OPTIONS SET .. to add an extension to be shippable while connections are already using the fdw. It'll be confusing if some clients are fast and some others are really slow. This seems more likely than anyone mucking around with extension stuff (adding new functions (and working with FDW in production at the same time?)) or adding/dropping whole extensions (you’ll have more problems than a stale cache, whole columns will disappear if you "DROP EXTENSION postgis CASCADE"), and has the added benefit of not needing me to muck into core stuff for my silly feature.
I’ll have a look at doing invalidation for the case of changes to the FDW wrappers and servers. P.
