Sorry for the bug.
At Thu, 25 Mar 2021 01:50:29 -0400, Tom Lane <tgl@sss.pgh.pa.us> wrote in
> Amul Sul <sulamul@gmail.com> writes:
> > On Wed, Mar 24, 2021 at 8:09 PM Tom Lane <tgl@sss.pgh.pa.us> wrote:
> >> static inline struct SMgrRelationData *
> >> RelationGetSmgr(Relation rel)
> >> {
> >> if (unlikely(rel->rd_smgr == NULL))
> >> RelationOpenSmgr(rel);
> >> return rel->rd_smgr;
> >> }
>
> > A quick question: Can't it be a macro instead of an inline function
> > like other macros we have in rel.h?
>
> The multiple-evaluation hazard seems like an issue. We've tolerated
> such hazards in the past, but mostly just because we weren't relying
> on static inlines being available, so there wasn't a good way around
> it.
>
> Also, the conditional evaluation here would look rather ugly
> in a macro, I think, if indeed you could do it at all without
> provoking compiler warnings.
FWIW, +1 for the function as is.
regards.
--
Kyotaro Horiguchi
NTT Open Source Software Center
