Github user zhangminglei commented on the issue:

    https://github.com/apache/flink/pull/4424
  
    @fhueske Thank you for your reply. Yes, I am always on the newest master 
branch every time I write code. What you said about causes that issue reason,  
it is did defined in ```org.apache.flink.table.utils._```. **But** the error is 
that ```UserDefinedFunctionTestUtils``` imports twice in the same scope. If we 
drop ```_``` and import specific class, we can get rid of this error. In 
```import org.apache.flink.table.utils._``` package, there is a class called 
```UserDefinedFunctionTestUtils``` and aslo in 
```org.apache.flink.table.runtime.utils```,  there is an object called 
```UserDefinedFunctionTestUtils```. So, that is directly leading to the 
compiler can not distinguish which one we want to choose. 
    
    BTW, I dont down what the reaction to this on Linux or Mac. I can not 
afford a Mac, so I think i can found this error. Lol.
    
    Yes. Recenly, I also found it seems that we have a new review code way like 
#4444 . OKay. I will follow the rule next time opening a PR.
    
    Thanks again,
    Minglei.


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