[GitHub] spark issue #18114: [SPARK-20889][SparkR] Grouped documentation for DATETIME...

[actuaryzhang]

Github user actuaryzhang commented on the issue:

    https://github.com/apache/spark/pull/18114
  
    For the date time functions, I create two groups: one for arithmetic 
functions that work with two columns `column_datetime_diff_functions`, and the 
other for functions that work with only one column `column_datetime_functions`. 
 Below is the screenshot for both. 
    
    
![image](https://user-images.githubusercontent.com/11082368/27315608-694c3c1e-552f-11e7-9001-7fcd203a6bdd.png)
    
![image](https://user-images.githubusercontent.com/11082368/27315611-6c5846b4-552f-11e7-926b-c7720625a66a.png)
    
![image](https://user-images.githubusercontent.com/11082368/27315613-6eaaa4ac-552f-11e7-8624-aa19029f49a9.png)
    
    



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