Github user wuchong commented on the issue:

    https://github.com/apache/flink/pull/3118
  
    Hi @twalthr , I have updated this PR. 
    
    I refactored the code of `FlinkCorrelate#generateFunction` to separate the 
generation of `FlatMapFunction` and `TableFunctionCollector`. This can fix the 
problem that the generated `TableFunctionCollector` contains another 
`TableFunctionCollector` instance variable and makes the logic clean. 


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