Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/6339#discussion_r35581919
--- Diff:
mllib/src/test/scala/org/apache/spark/ml/feature/StringIndexerSuite.scala ---
@@ -47,6 +47,11 @@ class StringIndexerSuite extends SparkFunSuite with
MLlibTestSparkContext {
// a -> 0, b -> 2, c -> 1
val expected = Set((0, 0.0), (1, 2.0), (2, 1.0), (3, 0.0), (4, 0.0),
(5, 1.0))
assert(output === expected)
+ // convert reverse our transform
+ val reversed = indexer.invert().transform(transformed.select("id",
"labelIndex"))
+ .select("id", "label")
+ assert(df.collect().map(r => (r.getInt(0), r.getString(1))).toSet ===
--- End diff --
It'd be nice to check more carefully by zipping the original label column
with the newly created one, and checking for equality.
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