This product is still in version 0.1 (means the very first version); This tool helps in below scenarios;
- Identify fields that are used in the Fields section of visualizations
- Identify tables that are used in the Fields or Filter sections of report tab
Providing such result then will help you to hide extra tables from the report. Or even remove them (this part needs some extra manual investigation as of now).
To learn more about this version, read this blog post.