There are some call sites using raw pointers to ParsedUpdate (or CanonicalUpdate after SERVER-113840 landes) like: 

• src/mongo/db/query/get_executor.h#L221
• src/mongo/db/query/get_executor.cpp#L1777
• src/mongo/db/exec/runtime_planners/classic_runtime_planner/planner_interface.h#L73
• src/mongo/db/exec/runtime_planners/classic_runtime_planner/planner_interface.cpp#L154
• src/mongo/db/exec/express/plan_executor_express.h#L82
• src/mongo/db/exec/express/plan_executor_express.cpp#L685

These raw pointers seem unnecessary and can be replaced with references to ensure their existences.

We could also check the same for ParsedDelete*.