// This is a command with secondary-possible read pref                                                                                                                                                     
// Only certain commands are supported for secondary operation.                                                                                                                                            
BSONObj actualQueryObj;                                                                                                                                                                                    
if (strcmp(queryObj.firstElement().fieldName(), "query") == 0) {                                                                                                                                           
    actualQueryObj = queryObj["query"].embeddedObject();                                                                                                                                                   
}                                                                                                                                                                                                          
else {                                                                                                                                                                                                     
    actualQueryObj = queryObj;                                                                                                                                                                             
}