Improvements to the update code moving parsing outside the dblock should be ported to batch_executor.cpp.
- is duplicated by
 - 
                    
SERVER-12347 WriteBatchExecutor should re-use an UpdateDriver across all updates
-         
 - Closed
 
 -         
 
Improvements to the update code moving parsing outside the dblock should be ported to batch_executor.cpp.
            
        
        SERVER-12347
        WriteBatchExecutor should re-use an UpdateDriver across all updates