Re: ERROR: unrecognized node type

On 9/29/21 8:37 PM, Tom Lane wrote:
> Adrian Klaver <adrian(dot)klaver(at)aklaver(dot)com> writes:
>> Unless folks are using plain text only email readers. That is why
>> screenshots are generally a bad idea for textual information. For the
>> record the Postgres version is 12.8.
>
> Hmm, if it's v12 then NodeTag 223 is T_List, which is ... a bit
> surprising. That's a common enough node type that "oversight"
> doesn't seem to fly as an explanation.
>
> I don't think we'll be able to make progress on this without a
> lot more detail. A self-contained example that triggers it
> would be very useful; or maybe you could get a backtrace from
> the point of the error?
>
> https://wiki.postgresql.org/wiki/Generating_a_stack_trace_of_a_PostgreSQL_backend
>

A handy trick for similar cases (not mentioned in the wiki) is to set

SET log_error_verbosity = verbose;

and then trigger the error. This logs the exact location (file:line)
where the error is printed, and then set a breakpoint to that place.
Makes it easier to generate the backtrace.

regards

--
Tomas Vondra
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company