HyukjinKwon opened a new pull request #24506: [SPARK-26921[R][DOCS] Document 
Arrow optimization and vectorized R APIs
URL: https://github.com/apache/spark/pull/24506
 
 
   ## What changes were proposed in this pull request?
   
   This PR adds SparkR with Arrow optimization documentation.
   
   Note that looks CRAN issue in Arrow side won't look likely fixed soon, IMHO, 
even after Spark 3.0.
   If it happen to be fixed, I will fix this doc too later.
   
   Another note is that Arrow R package itself requires R 3.5+. So, I 
intentionally didn't note this.
   
   ## How was this patch tested?
   
   Manually built and checked.
   

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