code: func (b UpdateMap) Get(ns, coll, key string) *statedb.VersionedValue {
  	nsPvtBatch, ok := b[ns]
  	if !ok {
  		return nil
  	}
  	return nsPvtBatch.Get(coll, key)
  }
docs: // Get retrieves the value from the batch for a given combination of namespace and collection name