Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/8830#discussion_r40292247
--- Diff:
mllib/src/test/scala/org/apache/spark/ml/feature/RFormulaParserSuite.scala ---
@@ -79,4 +87,79 @@ class RFormulaParserSuite extends SparkFunSuite {
assert(!RFormulaParser.parse("a ~ b - 1").hasIntercept)
assert(!RFormulaParser.parse("a ~ b + 1 - 1").hasIntercept)
}
+
+ test("parse interactions") {
+ checkParse("y ~ a:b", "y", Seq("a:b"))
+ checkParse("y ~ ._a:._x", "y", Seq("._a:._x"))
+ checkParse("y ~ foo:bar", "y", Seq("foo:bar"))
+ checkParse("y ~ a : b : c", "y", Seq("a:b:c"))
+ checkParse("y ~ q + a:b:c + b:c + c:d + z", "y", Seq("q", "a:b:c",
"b:c", "c:d", "z"))
+ }
+
+ test("parse basic interactions with dot") {
+ val schema = (new StructType)
+ .add("a", "int", true)
+ .add("b", "long", false)
+ .add("c", "string", true)
+ checkParse("y ~ .:x", "y", Seq("a:x", "b:x", "c:x"), schema)
--- End diff --
This is a little confusing because `x` and `y` do not appear in the schema.
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