Hmm. In looking at SET, why couldn't we develop this as an extendable
capability a la pg_proc? If PostgreSQL knew how to link up the set
keyword with a call to a subroutine, then we could go ahead and call
that routine generically, right? Do the proposals on the table call for
this kind of implementation, or are they all "extra-tabular"?
We could make this extensible by defining a separate table, or by
defining a convention for pg_proc as we do under different circumstances
with type coersion.
The side effects of the calls would still need some protection to be
rolled back on transaction abort.
Comments?
- Thomas
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