Currently, PlanSummaryStats structure contains both execution (QE) statistics and before-execuiton (QO) statistics. This makes separation of QE code more challenging.

Ideally, those should be 2 separate structures, and QO-part should be sufficient for the 'explain' command output when no execution statistics were requested. Likewise, the QE code also needs to fill only the QE-relevant part.

This improvement is related to SPM-4106, but can be done independently and is out of the project's scope.