[GitHub] [spark] beliefer opened a new pull request, #37116: [SPARK-39707][SQL][DOCS] Add SQL reference for aggregate functions

[GitBox]

beliefer opened a new pull request, #37116:
URL: https://github.com/apache/spark/pull/37116

   ### What changes were proposed in this pull request?
   Currently, Spark have a lot of built-in aggregate functions.
   But the SQL Reference cannot find these aggregate functions directly and 
cannot describe the special syntax for PERCENTILE_CONT and PERCENTILE_DISC.
   
   
   ### Why are the changes needed?
   Add SQL reference for aggregate functions
   
   
   ### Does this PR introduce _any_ user-facing change?
   'Yes'.
   Users can find these aggregate functions directly and the special syntax for 
PERCENTILE_CONT and PERCENTILE_DISC.
   
   Before this PR, the part 'Data Retrieval Statements' of 'SQL Syntax' show 
below.
   
![image](https://user-images.githubusercontent.com/8486025/177722840-b3b6cee3-cb73-467d-8ccb-f8eb00e87304.png)
   After this PR, the part 'Data Retrieval Statements' of 'SQL Syntax' show 
below.
   
![image](https://user-images.githubusercontent.com/8486025/177723000-55bb175b-9379-4f50-9ff8-87f89f30bd9a.png)
   
   The page 'Aggregate Functions' show below.
   
![image](https://user-images.githubusercontent.com/8486025/177723163-49ade016-a9b1-4c70-bd4e-fc8cb5d3ad1f.png)
   
![image](https://user-images.githubusercontent.com/8486025/177723272-f9f5d099-9d56-42fa-90ca-b213a1c826a9.png)
   
![image](https://user-images.githubusercontent.com/8486025/177723319-746b721f-1c10-478d-8bf2-76dbf0722112.png)
   
   
   ### How was this patch tested?
   N/A
   


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