The following review has been posted through the commitfest application:
make installcheck-world: tested, passed
Implements feature: tested, passed
Spec compliant: not tested
Documentation: not tested
I tested the patch and it works well. And according to the comment,
checking existence of relation and pg_class_aclcheck() won't influenced by concurrent DROP.
So I think it's safe to just reorder the checking existence of column and pg_attribute_aclcheck().
Thanks