Re: Constraint stuff (fwd)

I need to learn how to type headers I think... :(

Stephan Szabo
sszabo(at)bigpanda(dot)com

On Mon, 7 Aug 2000, Jan Wieck wrote:

> > More generally, the PL functions need to be able to deal with
> > recomputing saved plans after an ALTER of a table referenced by the
> > function. I haven't really thought about how to do that ... but it
> > seems like Stephan's idea of a table showing referencers and referencees
> > might help detect the cases where plans have to be flushed.
>
> More more generally, you cannot tell which objects are
> referenced from saved plans inside of a PL function. Might be
> possible for PL/pgSQL, where we could use a specialized
> invocation of the PL compiler to determine. But there's no
> way to do it for PL/Tcl or the like.

> We might end up with some general catalog sequence, bumped
> any time a schema change happens, and require each function
> to forget about all of it's saved plans for the next
> transaction. Ugly, but the only way I see to be consistent.

As a dumb question to help me understand better...
What exactly is saved in the plans and how are the plan saved for a
PL/Tcl function that does something where it generates a query that
you say don't know the table of until run time?