Re: postgres.h included from relcache.h - but removing it breaks pg_upgrade

Hi,

On 2021-09-18 02:51:09 +0300, Alexander Korotkov wrote:
> On Tue, Sep 14, 2021 at 6:53 AM Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> > Without having looked at the details, I think using a forward-declare
> > to avoid including relcache.h in visibilitymap.h might be a reasonably
> > non-painful fix.
>
> I like that idea, but I didn't find an appropriate existing header for
> forward-declaration of Relation. relation.h isn't suitable, because
> it includes primnodes.h. A separate header for just
> forward-definition of Relation seems too much.

I was just thinking of doing something like the attached.

> > TOH, in the long run it might be worth the effort
> > to split visibilitymap.h to separate useful file-contents knowledge
> > from backend function declarations.
>
> I've drafted a patch splitting visibilitymap_maros.h from
> visibilitymap.h. What do you think?

I'd name it visibilitymapdefs.h or such, mostly because that's what other
headers are named like...

Greetings,

Andres Freund