Unrelated to the OP's question, the suggestion above could be more simply rewritten as

TG_OP = 'UPDATE'
AND NEW.b IS DISTINCT FROM OLD.b
You're right! :)

Giuseppe.

--
Giuseppe Broccolo - 2ndQuadrant Italy
PostgreSQL Training, Services and Support
giuseppe.brocc...@2ndquadrant.it | www.2ndQuadrant.it



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