Enhance test when wrong metric is set

[bachng2017]

What

Try to solve this issue by query: re-data/re-data#395

How

Implement new test mechanism to check if metric (column) is correct might be an option but here we introduce a solution by sql query only. The query might be a little bit tricky and the solution is not very intuitive.

[davidzajac1]

@bachng2017 thanks for the PR! I tried testing this locally and it looks like the filters query {%- set filters = dbt_utils.get_query_results_as_dict(sql) -%} isn't returning anything thus when it compiles has the following snippet of SQL below resulting in an error:

where
    case
    
    else true
    end