Re: Parallel safety for extern params

On Fri, Mar 21, 2025 at 11:52 AM Tom Lane <tgl@sss.pgh.pa.us> wrote:
> I think this is completely wrong and should be reverted.  There
> cannot be a Param there, and if there were it would not represent
> a reference to the Gather's child.
>
> I tried reverting this code change, and check-world still passes,
> with or without debug_parallel_query = regress.  So if there is
> a case I'm missing, the regression tests don't expose it.

Did you try the test case from the original post on this thread?

I'm perfectly willing to believe that we messed up here -- this was 8
years ago and I don't remember the details -- but it surprises me a
little bit that I would have committed that change without verifying
that it was necessary to resolve the reported problem. However, I have
made such mistakes before and will probably make them again, so it
certainly could have happened.

--
Robert Haas
EDB: http://www.enterprisedb.com