Function query_report 

pub fn query_report(plan: &Plan) -> String

beck explain query — the view as a dataflow plan, operator by operator.

04 §4.7 asks for this command and 20 §20.5 says why it could not exist: “the Query sub-language is deliberately symbolic and there is no plan to explain”. There is one now, and this prints it — including the two things a developer cannot see any other way: which operator orders the output, and which side of §5.3’s session cut each one is on.