Right now the MultiPlanStage always writes to the classic cache a "works" value assuming that the cache entry will be executed in classic. To break this dependency, we can pass the MPS a callback that writes a cache entry with either a works value (classic) or a numReads value (SBE). We should take care to think about how this works with sub planning.

• • This may be a decision we want to change as we do the other linked sub-tasks. For now, this plan gives us plenty of flexibility though.