Folks,
I see that psql's \d displays trigger information of a table by making
a call to pg_catalog.pg_get_triggerdef(), which abstracts away most all need to
parse the contents of system catalog pg_trigger. However, we'd like to be able
to get at a human readable representation of just the WHEN clause of the
trigger expression. Function pg_get_expr() looked likely, but fails when fed a
pgqual value from pg_trigger ala:
ERROR: bogus varno: 2
I suspect that it is falling over dead trying to parse the
representation of NEW and / or OLD. Anything built in, or should we just make
call to pg_catalog.pg_get_triggerdef() and parse out the WHEN clause text?
Thanks!
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James Robinson
Socialserve.com by Emphasys Software
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