Re: Changing function from SECURITY DEFINER to SECURITY INVOKER changes query plan?

[Joe Van Dyk <joe@xxxxxxxxx>]

On Thu, Nov 21, 2013 at 6:11 PM, Tom Lane <tgl@xxxxxxxxxxxxx> wrote:

Joe Van Dyk <joe@xxxxxxxxx> writes:
> I had a function that was set to SECURITY INVOKER. I needed to give access
> to a view that uses this function to a role, so I made the function
> SECURITY DEFINER.

> The function is STABLE and is usually inlined and takes 2 ms to run.

> Immediately, the function quit being inlined and took 1500ms to run.

> Changing the function back to SECURITY DEFINER let the function be inlined
> again.

> On postgresql 9.3.1.

> Is this expected behavior?

Yes.  SECURITY DEFINER functions can't be inlined --- there would be
noplace to effect the change of user ID.

                        regards, tom lane

Thanks. Is that documented somewhere? I looked, couldn't find anything.