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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