Column comments are not updated in the UI

[petrikoro]

Currently changes in a column comment doesn't reflect on UI until I clear cache and restart it. I'd like it to be a part of metadata hash, so we could reflect changes in the UI during development and update model version with its metadata in the query engine.

The model description work fine, it gets updated in the UI, so the problem is only with column comments.

Model to reproduce:

/* Some table descriotion */
MODEL (
    name analytics_staging.stg_example__query,
    kind VIEW,
    cron '5 3 * * *',
    grain user_id,
    stamp '0.0.1',
    tags array['staging', 'example']
);

SELECT
    "id"::BIGINT AS user_id /* Some column's comment */
FROM analytics_raw.amocrm_users_v4;