schema comment: load column comment, pass to atlas migration

[CharlesGe129]

Context:
We uses atlas to generate versioned migration .sql files.

Problem:
The columns' comments defined in schema are not generated to ent/migrate/schema.go. Thus, the .sql files generated by atlas doesn't contain column comments such as (name varchar(255) NOT NULL COMMENT "name of entity") in MySQL.

[CharlesGe129]

ummm..., I may need your help to pass the unit tests. I think those failed tests are not related to my changes.

[a8m]

Thanks for the contribution @CharlesGe129 🙏

PR looks fine to me, but integration tests fail. Can you please try to rebase your branch on master? If it won't work, I'll pull the changes and try this.

[liasica]

Thanks for this PR @CharlesGe129 .

[CharlesGe129]

I think I just rebased and updated this PR. Could you please check again? Not sure if I followed the right process.

[CharlesGe129]

@a8m Sorry to bother again. I'm unable to fix the integration tests but I think it might be unrelated to the code I changed. Could you please check what's going on and tell me how may I help to solve that? Thanks!

[CharlesGe129]

Related issues: #2550 #2217 #1627 #1546

[a8m]

The issue was resolved with: https://entgo.io/docs/schema-annotations#database-comments.

Update your Ent version to master, and check out this tweet to see an example: https://twitter.com/entgo_io/status/1607394587009589248