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Re: pgAdmin III commit: Lots of work on domains, and check constraints

From: Guillaume Lelarge <guillaume(at)lelarge(dot)info>
To: Dave Page <dpage(at)pgadmin(dot)org>
Cc: Timon <timosha(at)gmail(dot)com>, pgadmin-hackers <pgadmin-hackers(at)postgresql(dot)org>
Subject: Re: pgAdmin III commit: Lots of work on domains, and check constraints
Date: 2012-09-05 21:13:52
Message-ID: 1346879632.2274.40.camel@localhost.localdomain (view raw or flat)
Thread:
Lists: pgadmin-hackers
On Wed, 2012-09-05 at 08:25 +0100, Dave Page wrote:
> On Tue, Sep 4, 2012 at 10:05 PM, Guillaume Lelarge
> <guillaume(at)lelarge(dot)info> wrote:
> > On Mon, 2012-09-03 at 22:41 +0200, Guillaume Lelarge wrote:
> >> On Mon, 2012-09-03 at 08:54 +0100, Dave Page wrote:
> >> > On Fri, Aug 31, 2012 at 10:57 PM, Guillaume Lelarge
> >> > <guillaume(at)lelarge(dot)info> wrote:
> >> > > On Sun, 2012-08-26 at 18:18 +0200, Guillaume Lelarge wrote:
> >> > >> On Mon, 2012-07-23 at 08:38 +0100, Dave Page wrote:
> >> > >> > On Sat, Jul 21, 2012 at 1:40 PM, Guillaume Lelarge
> >> > >> > <guillaume(at)lelarge(dot)info> wrote:
> >> > >> > > On Wed, 2012-06-06 at 10:50 +0600, Timon wrote:
> >> > >> > >> seems that this commit broke reindexing of selected index. steps to reproduce:
> >> > >> > >> 1) create table
> >> > >> > >> 2) create index
> >> > >> > >> 3) select index in object inspector
> >> > >> > >> 4) try to reindex it via maintenance menu item
> >> > >> > >> 5) got error : ERROR:  schema "table_name" does not exist
> >> > >> > >>
> >> > >> > >> and one more crash here
> >> > >> > >> .. same steps as before
> >> > >> > >> 4) try to CLUSTER index
> >> > >> > >> 5) pgadmin simply crashed
> >> > >> > >>
> >> > >> > >
> >> > >> > > OK, I finally got some time to work on this. As Timon said, these bugs
> >> > >> > > come from the patch "Lots of work on domains, and check constraints". In
> >> > >> > > this patch, I changed some objects parent class from pgTableObject to
> >> > >> > > pgSchemaObject. Due to this change, the GetTable() method returns NULL,
> >> > >> > > which segfaults all statements that try to use the return value without
> >> > >> > > checking. The two examples above from Timon are exactly this.
> >> > >> > >
> >> > >> > > I don't see many ways to get out of this issue.
> >> > >> > >
> >> > >> > > We could use GetSchema() instead of GetTable(). It works, it's an easy
> >> > >> > > and small patch. But it'll certainly be a maintenance nightmare (at
> >> > >> > > least without any comments)
> >> > >> > >
> >> > >> > > We could also revert my patch. It's simple, we loose the feature of
> >> > >> > > adding as many check constraints as we want to a domain, we loose the
> >> > >> > > feature of renaming and validating constraints, and we gain a few bugs.
> >> > >> > >
> >> > >> > > I don't see any other options. My own personal choice would be the first
> >> > >> > > one (see attached patch). But it's a tough call.
> >> > >> >
> >> > >> > We've run into problems in the past every time we've tried to share a
> >> > >> > sub-class between two parents. I think we should stop trying to do
> >> > >> > that, and just resign ourselves to having to duplicate the class - I
> >> > >> > guess pgCheckConstraint and pgDomainCheckConstraint is the way to go.
> >> > >>
> >> > >> I don't think I'll have the time and motivation to work on this before
> >> > >> we go GA. I guess I'll have to do this later on but in the mean time,
> >> > >> should I revert my commit or apply this patch?
> >> > >>
> >> > >
> >> > > Dave, any comment?
> >> >
> >> > What does the patch look like? As long as it's safe, well commented,
> >> > and overall the new code is an improvement, it seems like it's the
> >> > best option.
> >> >
> >>
> >> I'll work on it tomorrow. If it sounds good enough to me, I'll apply it.
> >> Otherwise, I'll revert my old patch.
> >>
> >
> > Done. I cannot say that it will fix all issues, but at least it fixes
> > the one I know. There's still an issue found by Erwin, that I can't be
> > sure because the trac website is still down.
> 
> Sorry - for some reason when you reported this before I got it into my
> head that you meant redmine.postgresql.org. Trac is fixed now.
> 

Oh OK, no problem. Thanks for fixing this.

The issue found by Erwin is fixed by the patch I applied yesterday. So
we're all good (or more, as good as we could :-/ ).


-- 
Guillaume
http://blog.guillaume.lelarge.info
http://www.dalibo.com



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