"Daniel Westermann (DWE)" <daniel.westermann@dbi-services.com> writes:
>> I was hoping someone more experienced with this would comment, but
>> seeing none, I will apply it in a day or two to all supported versions?
>> Have you tested this output back to 9.5?
> I hoped that as well. No, I tested down to 9.6 because the change happened in 10.
The patch assumes that parallel query is enabled, which is not true by
default before v10, so it should certainly not be applied before v10
(at least not without significant revisions).
regards, tom lane