Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/17967#discussion_r117906884
--- Diff: mllib/src/main/scala/org/apache/spark/ml/feature/RFormula.scala
---
@@ -37,6 +37,42 @@ import org.apache.spark.sql.types._
*/
private[feature] trait RFormulaBase extends HasFeaturesCol with
HasLabelCol {
+ /**
+ * Param for how to order categories of a string FEATURE column used by
`StringIndexer`.
+ * The last category after ordering is dropped when encoding strings.
+ * Supported options: 'frequencyDesc', 'frequencyAsc', 'alphabetDesc',
'alphabetAsc'.
+ * The default value is 'frequencyDesc'. When the ordering is set to
'alphabetDesc', `RFormula`
+ * drops the same category as R when encoding strings.
+ *
+ * The options are explained using an example `'b', 'a', 'b', 'a', 'c',
'b'`:
+ * {{{
+ *
+-----------------+---------------------------------------+----------------------------------+
--- End diff --
according to this, table is https://wiki.scala-lang.org/display/SW/Syntax
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