dilipbiswal opened a new pull request #27216: [SPARK-28588][DOC] Document 
SELECT statement in SQL Reference (Main page)
URL: https://github.com/apache/spark/pull/27216
 
 
   ### What changes were proposed in this pull request?
   Document SELECT statement in SQL Reference Guide. In this PR includes the 
main
   entry page for SELECT. I will open follow-up PRs for different clauses.
   
   ### Why are the changes needed?
   Currently Spark lacks documentation on the supported SQL constructs causing
   confusion among users who sometimes have to look at the code to understand 
the
   usage. This is aimed at addressing this issue.
   
   ### Does this PR introduce any user-facing change?
   Yes. 
   
   **Before:**
   There was no documentation for this.
   
   **After.**
   <img width="1093" alt="Screen Shot 2020-01-15 at 12 19 42 AM" 
src="https://user-images.githubusercontent.com/14225158/72417264-5a85de00-372d-11ea-874a-9fadeca51b31.png";>
   <img width="1093" alt="Screen Shot 2020-01-15 at 12 20 01 AM" 
src="https://user-images.githubusercontent.com/14225158/72417281-62458280-372d-11ea-9b7e-69cf24c6a273.png";>
   <img width="1093" alt="Screen Shot 2020-01-15 at 12 20 26 AM" 
src="https://user-images.githubusercontent.com/14225158/72417286-6671a000-372d-11ea-981a-396042c49b7e.png";>
   
   ### How was this patch tested?
   Tested using jykyll build --serve
   

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