Re: Way to get at parsed trigger 'WHEN' clause expression?
Did you mean something like
SELECT substring(pg_get_triggerdef(tg.oid, TRUE) FROM position('WHEN' in pg_get_triggerdef(tg.oid, TRUE))) AS when_cond
FROM pg_trigger tg WHERE tg.tgname = 'your_trigger_name';
--
Melvin Davidson
I reserve the right to fantasize. Whether or not you
wish to share my fantasy is entirely up to you. 
This doesn’t answer OP question.
Besides this query gets you not only “WHEN” clause but also whatever follows it, for instance “EXECUTE PROCEDURE…”
As for “pg_get_expr(pg_node_tree, relation_oid)” – looks like it doesn’t work with pg_trigger, because as a second parameter (Var) it expects relation_oid, and relation could have multiple triggers, so pg_get_expr() wouldn’t know which trigger’s tgqual you want to decompile.
Regards,
Igor Neyman
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