Heikki Linnakangas <heikki(at)enterprisedb(dot)com> writes:
> 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?
IIRC, the ODBC driver uses them, or once did, to deal with
concurrent-update situations --- it wants to be able to find the
currently committed version of a row it saw as valid earlier in the
transaction. I think it's sort of a client-side version of the
EvalPlanQual stuff. Hiroshi probably remembers more.
regards, tom lane