Github user HyukjinKwon commented on the issue:

    https://github.com/apache/spark/pull/18869
  
    @gatorsmile, I understand the previously discussed point, the documentation 
should be correct, tested well and in details. However, if I observed this 
correctly, this argument descriptions have not been well filled up for the last 
year (since I proposed `Arguments` description) - if I checked correctly, we 
have three 3 instances fixed, `replace`, `rlike` and `like`, out of 266 
instances.
    
    I mean, practically, it sounds a bit demanding to me. (In this way, for the 
perfectness, I think we should also require to add test cases with all the 
possible types and check if there is any duplicated test too). I wonder if we 
really should add the examples about all the cases we _assume_  users might be 
confused of, and describe it that precisely for the current state, given the 
information did not exist before.
    
    Of course, it is important and it should be correct but I have been 
thinking of incrementally improving this, rather than requesting the perfectly 
correct documentation for PRs, practically to roll it better.
    
    What do you think about minimising the test cases and rather trying to 
describe it a bit more in an abstract, short and general manner for now? We 
could ask additional test cases for additional information in the followup PRs.
    
    For this PR, it looks good enough to me (to be honest, the examples and 
test cases look too much) but I believe I need your opinion and I think we 
should have a compromised position.


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