Heikki Linnakangas wrote:
In utils/adt/tid.c, there's two mysterious functions with no comments, and no-one calling them inside backend code AFAICT: currtid_byreloid and currtid_byrelname. What do they do/did?

If you have a look at the CVS annotations ( http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/tid.c?annotate=1.57 ) you can see that they were introduced at version 1.12 ( http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/tid.c.diff?r1=1.11;r2=1.12;f=h )
which has the comment:

The 1st step to implement new type of scan,TidScan.
Now WHERE restriction on ctid is allowed though it is
sequentially scanned.

I often find I have to do this sort of digging to understand what's going on 
(or find a guilty party :-) ).



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