Re: [HACKERS] WIP: Faster Expression Processing v4

Hi,

On 2017-03-23 13:14:59 -0400, Tom Lane wrote:
> Looking at some of the coding choices you made here, I see that you're
> making a hard assumption that called functions never scribble on their
> fcinfo->arg/argnull arrays.  I do not believe that we've ever had such
> an assumption before.

I think we did that before, e.g. ExecEvalScalarArrayOp(). Think there's
others too.


> Are we comfortable with that?  If so, we'd better document it.

I think it's ok, but we indeed should document it. I recall a note
somewhere... Can't find it anywhere however, might have misremembered a
note about pass-by-ref arguments.  fmgr/README? A note in
FunctionCallInfoData's definition?

Greetings,

Andres Freund