Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/7972#discussion_r36363058
--- Diff: mllib/src/main/scala/org/apache/spark/ml/util/SchemaUtils.scala
---
@@ -72,4 +74,21 @@ private[spark] object SchemaUtils {
require(!schema.fieldNames.contains(col.name), s"Column ${col.name}
already exists.")
StructType(schema.fields :+ col)
}
+
+ /**
+ * Takes a Vector column and a list of feature names, and returns the
corresponding list of
+ * feature indices in the column, in order.
+ * @param col Vector column which must have feature names specified via
attributes
+ * @param names List of feature names
+ */
+ def getFeatureIndicesFromNames(col: StructField, names: Array[String]):
Array[Int] = {
--- End diff --
Maybe this should go to `MetadataUtils`.
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