Cannot detect the default value for a `generated always as identity` column

[fluca1978]

When a column is defined as generated always as identity, the COLUMN_DEF returned by the column_info method is empty. This apparently is correct, since pg_get_expr() does not return anything.
However, this could be a problem with other tools, like DBIx::Schema::Loader that are not able to detect that the column is "attached" to a sequence behind the scenes.

[cblake777]

We're currently running into this issue as well. It's not a problem as it is just a warning, but it is annoying for our systems.

[fluca1978]

We're currently running into this issue as well. It's not a problem as it is just a warning, but it is annoying for our systems.

It's more than a simple warning, since other tools could not be able to determine the default value with an empty column default value definition.

[cblake777]

Fair enough, I should rephrase that it's for us it's treating the column as an autoinc and retrieving the value automatically, so the impact for us has been low. It would be much better if we didn't have to deal with it, however.