Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/7771#discussion_r35914262
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/attribute/AttributeGroup.scala ---
@@ -165,6 +165,11 @@ class AttributeGroup private (
/** Converts to a StructField. */
def toStructField(): StructField = toStructField(Metadata.empty)
+ override def toString: String = {
--- End diff --
Is it required? Please keep this PR minimal. You can create another PR if
`toString` is useful for AttributeGroup. (Btw, we can reuse the JSON
serialization in `toString`.)
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