Re: Avoid possible deference NULL pointer (src/backend/optimizer/path/allpaths.c)

Daniel Gustafsson <daniel@yesql.se> writes:
> On 5 Feb 2025, at 18:34, Ranier Vilela <ranier.vf@gmail.com> wrote:
>> This is evidence that we do not have reports about this bug.

> Before that can be stated it needs to be determined if this is a bug, this
> thread has not done that yet.

It's not a bug.  Since the call specifies NIL pathkeys (meaning it
doesn't care about sort order) and does not insist on a parallel-safe
path, there should always be a path that satisfies it.  The only
way it could fail to find a path is if the rel's pathlist is entirely
empty, a case already rejected by the sole caller.

Moreover, the argument that we might not have gotten a report is not
credible.  In a production build without an Assert, the next line
would still dump core just as effectively if the result were NULL.

While the proposed patch doesn't break anything, it's removing a
logic cross-check that was put there intentionally.  So I don't
find it to be an improvement.

            regards, tom lane