Re: Concurrently updating an updatable view

Heikki Linnakangas wrote:
> The problem is that the new tuple version is checked only against the 
> condition in the update rule, id=OLD.id, but not the condition in the 
> original update-claus, dt='a'.
> 
> Yeah, that's confusing :(.

Bit more than just normal rule confusion I'd say. Try the following two 
statements in parallel (assuming you've just run the previous):

UPDATE test SET dt='c';
UPDATE test SET dt='x' FROM test t2 WHERE test.id=t2.id AND t2.dt='b';

This isn't a problem with the view mechanism - it's a problem with 
re-checking clauses involving subqueries or joins I'd guess.

I'm trying to decide if it's unexpected or just plain wrong, and I think 
I'd have to argue wrong.

--   Richard Huxton  Archonet Ltd