Re: Oversight in reparameterize_path_by_child leading to executor crash

On Mon, Jan 8, 2024 at 3:32 AM Richard Guo <guofenglinux@gmail.com> wrote:
> Thanks for the suggestion.  Attached is an updated patch which is added
> with a commit message that tries to explain the problem and the fix.

This is great. The references to "the sampling infos" are a little bit
confusing to me. I'm not sure if this is referring to
TableSampleClause objects or what.

> Fair point.  I think we can back-patch a more minimal fix, as Tom
> proposed in [1], which disallows the reparameterization if the path
> contains sampling info that references the outer rel.  But I think we
> need also to disallow the reparameterization of a path if it contains
> restriction clauses that reference the outer rel, as such paths have
> been found to cause incorrect results, or planning errors as in [2].

Do you want to produce a patch for that, to go along with this patch for master?

I know this is on Tom's to-do list which makes me a bit reluctant to
get too involved here, because certainly he knows this code better
than I do, maybe better than anyone does, but on the other hand, we
shouldn't leave server crashes unfixed for too long, so maybe I can do
something to help at least with that part of it.

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