If the ALTER is changing the column type, it's not really the same column anymore;
This doesn't strike. "If the ALTER is changing the number of columns, it's not really the same table anymore" is as true as your statement. Still, pg_class.oid remains the same for ADD and DROP column.
I see nothing wrong with assigning a new attnum in that
scenario. It's not like you can simply change the type and not go visit
the references in such a case.
But this fix is about automatically updating references as well, making the ALTER COLUMN appear a low-impact change to the user (which obviously isn't true, unless my proposed shortcut for binary compatible type changes is implemented).
When dropping and recreating an object, nobody would expect to get the same identifier. When altering, I *do* expect the identifier to remain the same.
Regards, Andreas
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