Add optional exclude_columns to the equality test

[seub]

Describe the feature

It'd be nice to have an optional exclude_columns in the equality test, similar to compare_columns:

    tests:
      - dbt_utils.equality:
          compare_model: ref('other_table_name')
          exclude_columns:
            - third_column
            - fourth_column

Such columns would be ignored when comparing the two tables.

Describe alternatives you've considered

1. Rewrite the test in our projects
2. Somehow leverage compare_relations from dbt-audit-helper

I don't think either solution is great compared to adding the feature here.

Additional context / Who will this benefit?

As an example, here's why my team would like this. We leverage the equality test from dbt-utils to implement unit tests. However, we need to exclude the "processing timestamp" column, as it cannot be predicted for the "expected output" model.

Are you interested in contributing this feature?

Yep! In fact, I wrote the PR (#829 ) before the issue, because I'd forgotten that all PRs must be associated with an issue, oops.

[github-actions]

This issue has been marked as Stale because it has been open for 180 days with no activity. If you would like the issue to remain open, please comment on the issue or else it will be closed in 7 days.

[github-actions]

Although we are closing this issue as stale, it's not gone forever. Issues can be reopened if there is renewed community interest. Just add a comment to notify the maintainers.

[seub]

Hi @dbeatty10 , thank you for re-opening this PR.

However I think it can be closed, given that this other PR was merged.