message: Explicitly instantiate ConstObj::get<util::Optional<ObjectId>>
diff: @@ -1208,6 +1208,7 @@ template StringData ConstObj::get<StringData>(ColKey col_key) const;
  template BinaryData ConstObj::get<BinaryData>(ColKey col_key) const;
  template Timestamp ConstObj::get<Timestamp>(ColKey col_key) const;
  template ObjectId ConstObj::get<ObjectId>(ColKey col_key) const;
  +template util::Optional<ObjectId> ConstObj::get<util::Optional<ObjectId>>(ColKey col_key) const;
  template ObjKey ConstObj::get<ObjKey>(ColKey col_key) const;
  template Decimal128 ConstObj::get<Decimal128>(ColKey col_key) const;
  