[GitHub] [spark] PavithraRamachandran opened a new pull request #25590: [SPARK-28791] [DOC] Documentation for Alter table Command

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PavithraRamachandran opened a new pull request #25590: [SPARK-28791] [DOC] 
Documentation for Alter table Command
URL: https://github.com/apache/spark/pull/25590
 
 
   What changes were proposed in this pull request?
   Document ALTER TABLE statement in SQL Reference Guide.
   
   Why are the changes needed?
   Adding documentation for SQL reference.
   
   Does this PR introduce any user-facing change?
   yes
   
   Before:
   There was no documentation for this.
   
   After.
   ![image 
(1)](https://user-images.githubusercontent.com/51401130/63741344-52c6b980-c8b2-11e9-9b9d-729645056e5d.png)
   
   ![image 
(2)](https://user-images.githubusercontent.com/51401130/63741350-59553100-c8b2-11e9-8403-28701d748d17.png)
   
   
   ![image 
(3)](https://user-images.githubusercontent.com/51401130/63741351-5e19e500-c8b2-11e9-845c-cd9101a24136.png)
   
   
   
   How was this patch tested?
   Used jekyll build and serve to verify.

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