felixcheung commented on a change in pull request #24939: [SPARK-18569][ML][R]
Support RFormula arithmetic, I() and spark functions
URL: https://github.com/apache/spark/pull/24939#discussion_r320055670
##########
File path:
mllib/src/main/scala/org/apache/spark/ml/feature/RFormulaParser.scala
##########
@@ -247,9 +273,24 @@ private[ml] case class Terms(terms: Seq[Term]) extends
Term {
/**
* Limited implementation of R formula parsing. Currently supports: '~', '+',
'-', '.', ':',
- * '*', '^'.
+ * '*', '^', 'I()'.
*/
-private[ml] object RFormulaParser extends RegexParsers {
+private[ml] object RFormulaParser extends RegexParsers with EvalExprParser {
+
+ /**
+ * Whether to skip whitespace in literals and regex is currently only
achived with
Review comment:
`achieved`
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