On 19t of January, Heikki Linnakangas committed patch: Make pg_relation_size() and friends return NULL if the object doesn't exist. That avoids errors when the functions are used in queries like "SELECT pg_relation_size(oid) FROM pg_class", and a table is dropped concurrently. Phil Sorber

On 18th of July, Tom Lane committed patch: Add GET STACKED DIAGNOSTICS plpgsql command to retrieve exception info. This is more SQL-spec-compliant, more easily extensible, and better performing than the old method of inventing special variables. Pavel Stehule, reviewed by Shigeru Hanada and David ...