vitektarasenko opened a new pull request #23765: fix for condtadiction about 
structured streaming sliding window wate
URL: https://github.com/apache/spark/pull/23765
 
 
   …mark condition formula
   
   This change solves contradiction in structured streaming documentation in 
formula which tests if specific window will be updated by calculating watermark 
and comparing with "T" parameter. By further examples the "T" seems to be the 
end of the window, not start like documentation says firstly. For more 
information please take a look at mine question in stackoverflow 
https://stackoverflow.com/questions/54599594/understanding-window-with-watermark-in-apache-spark-structured-streaming
   
   
   Can be tested by building documentation.
   
   
   

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