Describe the problem

Please describe the issue you observed, and any steps we can take to reproduce it:
If a column has a comment (via COMMENT ON), the comment will be missing in the cockroach dumo --dump-mode schema output.

To Reproduce

What did you do? Describe in your own words.

If possible, provide steps to reproduce the behavior:

1. Create a schema with a comment (the example in the docs will do)
2. Issue cockroach dump --dump-mode schema <database> | grep COMMENT
3. Observe the lack of output, which implies no comment was dumped with the schema.

Expected behavior
The schema is dumped with all comments.

Environment:

• CockroachDB version v19.2.0
• Server OS: Linux/archlinux
• Client app cockroach dump

Additional context
What was the impact?

It silently swallowed my comments, which specified preliminary enum mappings for int2 columns. Thankfully it wasn't much.