Justin Pryzby <pryzby(at)telsasoft(dot)com> writes:
> On Wed, Nov 04, 2020 at 07:43:51PM -0500, Tom Lane wrote:
>> As was discussed in the thread leading up to that commit, modifying the
>> signature of array_cat and friends could break user-defined operators
>> and aggregates based on those functions. It seems to me that the
>> usability gain from this change is worth that cost, but it is causing
>> an issue for xversion tests.
> But I think this should be called out as an incompatible change in the release
> notes.
If it was not, yes it should be.
regards, tom lane