ozancicek opened a new pull request #24764: [SPARK-18570][ML] RFormula support 
* and ^ operators
URL: https://github.com/apache/spark/pull/24764
 
 
   ## What changes were proposed in this pull request?
   
   Added support for `*` and `^` operators, along with expressions within 
parentheses. New operators just expand to already supported terms, such as;
   
    - y ~ a * b = y ~ a + b + a : b
    - y ~ (a+b+c)^3 = y ~ a + b + c + a : b + a : c + a :b : c 
   
   ## How was this patch tested?
   
   Added new unit tests to RFormulaParserSuite
   
   @mengxr @yanboliang 

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