[GitHub] spark issue #18025: [WIP][SparkR] Update doc and examples for sql functions

[actuaryzhang]

Github user actuaryzhang commented on the issue:

    https://github.com/apache/spark/pull/18025
  
    This is what the `'column_aggregate_functions.Rd'` doc looks like:
    
    
![image](https://cloud.githubusercontent.com/assets/11082368/26190195/fd353224-3b5c-11e7-9a78-2607cc665f49.png)
    
![image](https://cloud.githubusercontent.com/assets/11082368/26190198/ff5e2cae-3b5c-11e7-8942-271cd8a5a3cc.png)
    
![image](https://cloud.githubusercontent.com/assets/11082368/26190200/013f8356-3b5d-11e7-82fd-ee9e79228027.png)



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