Cubejs Playground App should have select column option and set title

[norbertbede]

Is your feature request related to a problem? Please describe. This change request related to make simplier UX for BI consultation when the task is create on existing complex datasource a smart CubeJS. So when i start to create a new schema I have option A. generate a schema B. create manually. When I generate it the system generates each columns found in source table so I need open schema then remove each unnecessary columns/dimensions. However when i create from scratch i should make some mistakes and find columns from source db - both takes too much time. Really frustrate me.

Use Case: I assume I have postgres includes 60 columns, however the output require only 10 dimensions. BI Consultant would like select columns to be converted into schema dimensions.

Describe the solution you'd like As simple and powerful solution would be improve schema generation by adding in right pane a "table" list all fields including fieldtypes and title column. tasks

1. admin/biconsultant select table in left pane (fields and table listed)
2. Consultant select fields by checkbox - as candidates to be converted into dimension
3. Set titles for dimensions.
4. click on Generate Scheme (cubejs generate new schema excluding fields and set titles)

Describe alternatives you've considered probably later some filters for column - filter as type- should speed up select each right columns.

Additional context

[paveltiunov]

@norbertbede Hey Norbert! Thanks for posting this! I believe it would be great addition to the schema generation.