shuiqiangchen commented on PR #19958:
URL: https://github.com/apache/flink/pull/19958#issuecomment-1159743320

   @dianfu Thank you for your suggestions. I have updated the PR accordingly, 
please have a look.
   Changes are as followed:
   - added firstValue and lastValue in BaseExpressions
   - added first_value and last_value in expression.py.
   - Reused the existing ITCase.
   - updated the documentation for System (Built-in) Functions
   
   And there is a minor issue , I find that the functions documentation for 
python is redirect to System (Built-in) Functions documentation for Java API.  
It's first_value() in python while firstValue() in Java, which seems unaligned 
that the doc might be a bit misleading.


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