Github user hongyuhong commented on the issue:

    https://github.com/apache/flink/pull/3175
  
    Hi, @wuchong, @sunjincheng121 ,
    Thank you very much for correcting my mistake!I will study deeply and 
modify the code. The pr temporarily only consider the processing-time and 
preceding section, and just do a translate between sql and logicalplan, cause 
currently  i can't find a windowoperator to describe the following section and 
event-time. I agree with that if row-window has been implement on tableapi, the 
streaming sql can support easily.
    Thank you again for your advice.


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