Github user twalthr commented on the pull request:

    https://github.com/apache/flink/pull/359#issuecomment-73028436
  
    The discussion is how a Function without any generics (raw) should be 
treated. 
    
    In general we have 3 possiblities:
    - Skip input validation completely if Function implements 
ResultTypeQueryable
    - Introduce a Interface /Anntotation SkipInputValidation for special use 
cases
    - This PR: Skip input validation if Function is a raw type.


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