Re: Scan by TID (was RE: [HACKERS] How to add a new build-in operator)

> "Hiroshi Inoue" <Inoue@tpf.co.jp> writes:
> > Yes,I have done a part of my story.
> > I would add new type of path and scan by which we are able to access
> > tids directly.
> 
> Yes, new path type, new plan type, probably a new access method if
> you want to keep things clean in the executor, cost-estimation routines
> in the planner, etc. etc.
> 
> Looks like a lot of work, and a lot of added code bulk that will
> have to be maintained.  I haven't figured out why you think it's
> worth it... tids are so transient that I don't see much need for
> finding tuples by them...

Ingres has access by tid, and it does come in handy for quick-and-dirty
uses where you just want to snag a bunch of rows and operate on them
without too much fuss.  I believe if we had it, some things internally
may prove to be easier with them accessible in a query.


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