On Mon, May 15, 2006 at 11:17:41AM -0400, Jonah H. Harris wrote: > On 5/15/06, Martijn van Oosterhout <kleptog@svana.org> wrote: > >tableoid is a pseudo-column like you mean, perhaps you should look how > >that works. > > I thought tableoid was a system column with a physical representation > on the tuple itself? I don't want any on-disk representation of my > pseudocolumn... just assigned at runtime similar to rownum.
Tableoid is certainly not stored on disk (waste of space) but retreived specially whenever someone asks for the tableoid column. See heap_getsysattr in access/common/heaptuple.c. All you need to do is decide where you are going to store the level number and add it as a system attribute (negative attribute number). Have a nice day, -- Martijn van Oosterhout <kleptog@svana.org> http://svana.org/kleptog/ > From each according to his ability. To each according to his ability to > litigate.
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