=?UTF-8?Q?Piotr_W=C5=82odarczyk?= <piotrwlodarczyk89(at)gmail(dot)com> writes:
> I think we found BUG in version from 11.4 to 11.5 (maybe and previous).
Yeah, looks like the ScalarArrayOpExpr path in
match_clause_to_partition_key forgot to consider the possibility
of a constant-null array. Will fix, thanks for the report!
regards, tom lane