> If the backend can not handle the version I request, but can handle a > prior version, I'd like to know. I am planning on having handlers for > multiple protocol versions in the same memory space (I'm using > Smalltalk, BTW) so that one application can talk to various databases of > various vintages. > how about a system table, say pg_features which can be queried by the fe interface? This could be a table of bools with named features and/or other little widgets for compatibility. No protocol modification required, unless the scope of the protocol change is such that you can't execute a connection and a query.
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