Background

First some background to both Salesforce and Query Folding. Salesforce is a popular cloud enterprise software provider. Which, more importantly for this post, has a Power Query connector. It actually has two, the object and the report connector. However this only applies to the object connector. The object connector allows connection to the underlying tables that sit behind salesforce. Querying salesforce is done with a SQL-like language called Salesforce Object Query Language [SOQL]. You can see easily with the Salesforce Workbench.