Re: Tom Lane > > Extending the idea, perhaps the check could be moved to run-time and > > recursively check that only immutable functions are called, including > > user-defined immutable functions? > > I don't think I'd trust that. UDFs can claim to be immutable but > be lying about it.
That's why I said "recursively". Then truly immutable user-defined functions could still be used. But practically, people will probably want to select from other tables anyway (I've already had to tell a customer that virtual columns do not allow that), so the use-case for user immutable functions is probably very thin. Christoph
