> On 2022-01-20, 12:52 PM, "Tom Lane" <tgl@xxxxxxxxxxxxx> wrote: > > Garfield Lewis <garfield.lewis@xxxxxxxxxx> writes: > > I need the page and possibly row of the data location to be stored as an element of the new type. This is to simulate a structure from another database system. > > You need to rethink. The datatype input function cannot know even that > the value is going to be stored anywhere, let alone exactly where. > Moreover, what would happen if the row is moved somewhere else due > to an update of some other column? > > You might be able to build something for cross-linking by putting > the logic in AFTER INSERT/UPDATE/DELETE triggers, but I think a > custom datatype is not going to be helpful for that. > > regards, tom lane Thx, Tom... I think you are right in the case of INPUT/RECEIVE, however we should be able to get that info during OUTPUT/SEND (I think) since it is fixed at that point. At the time I return the information to the user I could augment the output to add that information to the output. However, I still don't know if it is even possible to get that information in those functions. Is that at all possible? Regards, Garfield
