Re: struct RelOptInfo member relid comments

On Fri, May 24, 2024 at 11:14 AM Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>
> jian he <jian(dot)universality(at)gmail(dot)com> writes:
> > imho, the above comment is not very helpful.
> > we should say more about what kind of information relid says about a base rel?
>
> "Relid" is defined at the very top of the file:
>
> /*
> * Relids
> * Set of relation identifiers (indexes into the rangetable).
> */
> typedef Bitmapset *Relids;
>
> Repeating that everyplace the term "relid" appears would not be
> tremendously helpful.
>

`Index relid;`
is a relation identifier, a base rel's rangetable index.

Does the above description make sense?

BTW, I found several occurrences of "base+OJ", but I cannot find the
explanation of "OJ" or the "OJ" Acronyms.