Github user mxm commented on the pull request:

    https://github.com/apache/flink/pull/1375#issuecomment-157736688
  
    From what I've seen so far, users are very puzzled about execute() after 
collect(). This was even more of a problem because we once had this in our 
quickstart examples. Initially, I was convinced ignoring `execute()` after 
`collect()` would be a good solution. On second thought, it creates new 
problems like users wondering why their program doesn't do anything..
    
    So +1 for closing the issue.


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