Re: [HACKERS] Issue with circular references in VIEW

Le 24/07/2017 à 19:19, Tom Lane a écrit :
> Gilles Darold <gilles.darold@dalibo.com> writes:
>> There is an issue with version prior to 10 when dumping views with circular
>> references. I know that these views are now exported as views in 10 but they
>> are still exported as TABLE + RULE in prior versions. This conduct to the
>> following error when columns of sub-queries doesn't have the same aliases
>> names:
> The core of this issue, I think, is that pg_get_viewdef() knows that it
> should make what it prints have output column names that match the view,
> whereas pg_get_ruledef() does not, even when it is printing an ON SELECT
> rule.  This is a little bit surprising --- you'd really expect those
> functions to produce identical SELECT statements --- and I think it's
> likely to break other tools even if pg_dump has managed to skirt the
> issue.  So I'm inclined to think in terms of fixing it at that level
> rather than in pg_dump.  It doesn't look like it would be hard to fix:
> both functions ultimately call get_query_def(), it's just that one passes
> down a tuple descriptor for the view while the other currently doesn't.

I was thinking that this was intentional that pg_get_ruledef() returns
the raw code typed by the user. I will fix it and send a patch following
your explanation.

Thanks.

-- 
Gilles Darold
Consultant PostgreSQL
http://dalibo.com - http://dalibo.org