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In case of internal backend the method returns original iterator.
In case of external backend the iterator is buffered ( = all elements are downloaded from remote h2o node ) so they are available locally and are provided as a new iterator
 
      
    
       
      
    
      
     
      
    
       
      
    
       
      
    
       
      
    
       
      
    
       
      
    
       
      
    
       
      
    
       
      
    
       
      
    
       
      
    
       
      
    
       
      
    
      