RelationFlushRelation() or RelationClearRelation()

Hi,
 I've almost got the ALTER TABLE RENAME fixed so it doesn't break
triggers referring to the renamed column.  The final problem is that
after the pg_trigger.tgargs is updated, that change is not visible 
in the current backend.  I see that there are a couple of interesting
functions to refresh the RelationCache:
 RelationClearRelation(Relation, bool);
 RelationFlushRelation(Relation);

Which one of these should I use to have the new pg_trigger data visible
in the current backend?  Or is there a better way than either of these?

I should be able to clean up this work and send a patch tomorrow 
evening if I get this kink worked out.

Thanks, Brent

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