Re: BUG #16655: pg_dump segfault when excluding postgis table

I wrote:
> 0001 is sufficient to get past the proposed test case in 0002.  However,
> I think processExtensionTables is also buggy here.  It does need to set
> the "interesting" flag to true if it decides we need to dump the table's
> data, because we have to have the per-attribute data to support that,
> and "interesting" might not ever get set true on the table otherwise.
> But *it is not OK to set "interesting" to false just because we don't
> decide to dump the data*.  If it's been set true for some other reason,
> that other reason didn't just vanish.  So I think we also need 0003.

Upon excavating in the git history, I discovered that that error was
introduced in 3eb3d3e78 [1], which explains why the OP thought it was
new in v13 --- no other branch has shipped the buggy code yet.

It's not entirely clear to me why we don't get a crash on the case in
pre-v12 branches, but I'm inclined to apply these patches all the way
back anyway, as they definitely seem like robustness improvements
whether or not a given branch accidentally fails to fail.

			regards, tom lane

[1] https://www.postgresql.org/message-id/flat/18048b44-3414-b983-8c7c-9165b177900d%402ndQuadrant.com