Re: [PATCH v1] Show whether tables are logged in \dt+

On Sat, 27 Apr 2019 at 06:18, David Fetter <david(at)fetter(dot)org> wrote:
>
> On Fri, Apr 26, 2019 at 04:22:18PM +0200, Rafia Sabih wrote:
> > On Fri, 26 Apr 2019 at 14:49, Rafia Sabih <rafia(dot)pghackers(at)gmail(dot)com> wrote:
> > >
> > > On Wed, 24 Apr 2019 at 10:30, Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr> wrote:
> > > >
> > > >
> > > > Hello David,
> > > >
> > > > >>> I noticed that there wasn't a bulk way to see table logged-ness in psql,
> > > > >>> so I made it part of \dt+.
> > > > >>
> > > > >> Applies, compiles, works for me.
> > > > >>
> > > > >> ISTM That temporary-ness is not shown either. Maybe the persistence column
> > > > >> should be shown as is?
> > > > >
> > > > > Temporariness added, but not raw.
> > > >
> > > > Ok, it is better like this way.
> > > >
> > > > >> Tests?
> > > > >
> > > > > Included, but they're not stable for temp tables. I'm a little stumped
> > > > > as to how to either stabilize them or test some other way.
> > > >
> > > > Hmmm. First there is the username which appears, so there should be a
> > > > dedicated user for the test.
> > > >
> > > > I'm unsure how to work around the temporary schema number, which is
> > > > undeterministic with parallel execution it. I'm afraid the only viable
> > > > approach is not to show temporary tables, too bad:-(
> > > >
> > > > >> Doc?
> > > > >
> > > > > What further documentation does it need?
> > > >
> > > > Indeed, there is no precise doc, so nothing to update :-)/:-(
> > > >
> > > >
> > > > Maybe you could consider adding a case for prior 9.1 version, something
> > > > like:
> > > > ... case c.relistemp then 'temporary' else 'permanent' end as ...
> > > >
> > > >
> > > I was reviewing this patch and found a bug,
> > >
> > > create table t (i int);
> > > create index idx on t(i);
> > > \di+
> > > psql: print.c:3452: printQuery: Assertion `opt->translate_columns ==
> > > ((void *)0) || opt->n_translate_columns >= cont.ncolumns' failed.
> >
> > Looking into this further, apparently the position of
> >
> > if (verbose)
> > {
> > + /*
> > + * Show whether the table is permanent, temporary, or unlogged.
> > + */
> > + if (pset.sversion >= 91000)
> > + appendPQExpBuffer(&buf,
> > + ",\n case c.relpersistence when 'p' then 'permanent' when 't'
> > then 'temporary' when 'u' then 'unlogged' else 'unknown' end as
> > \"%s\"",
> > + gettext_noop("Persistence"));
> >
> > is not right, it is being called for indexes with verbose option also.
> > There should be an extra check for it being not called for index case.
> > Something like,
> > if (verbose)
> > {
> > /*
> > * Show whether the table is permanent, temporary, or unlogged.
> > */
> > if (!showIndexes)
> > if (pset.sversion >= 91000)
> > appendPQExpBuffer(&buf,
> > ",\n case c.relpersistence when 'p' then 'permanent' when 't' then
> > 'temporary' when 'u' then 'unlogged' else 'unknown' end as \"%s\"",
> > gettext_noop("Persistence"));
> >
> > Not sure, how do modify it in a more neat way.
>
> I suspect that as this may get a little messier, but I've made it
> fairly neat short of a major refactor.
>
I found the following warning on the compilation,
describe.c: In function ‘listTables’:
describe.c:3705:7: warning: this ‘if’ clause does not guard...
[-Wmisleading-indentation]
else if (pset.sversion >= 80100)
^~
describe.c:3710:3: note: ...this statement, but the latter is
misleadingly indented as if it were guarded by the ‘if’
appendPQExpBuffer(&buf,

Talking of indentation, you might want to run pgindent once. Other
than that the patch looks good to me.
--
Regards,
Rafia Sabih