[SPARK-16133][ML] model loading backward compatibility for ml.feature

## What changes were proposed in this pull request?

model loading backward compatibility for ml.feature,

## How was this patch tested?

existing ut and manual test for loading 1.6 models.

Author: Yuhao Yang <yuhao.yang@intel.com>
Author: Yuhao Yang <hhbyyh@gmail.com>

Closes #13844 from hhbyyh/featureComp.

mllib/src/main/scala/org/apache/spark/ml/feature/IDF.scala

@@ -27,6 +27,7 @@ import org.apache.spark.ml.param.shared._
 import org.apache.spark.ml.util._
 import org.apache.spark.mllib.feature
 import org.apache.spark.mllib.linalg.{Vector => OldVector, Vectors => OldVectors}
+import org.apache.spark.mllib.util.MLUtils
 import org.apache.spark.rdd.RDD
 import org.apache.spark.sql._
 import org.apache.spark.sql.functions._
@@ -180,9 +181,9 @@ object IDFModel extends MLReadable[IDFModel] {
       val metadata = DefaultParamsReader.loadMetadata(path, sc, className)
       val dataPath = new Path(path, "data").toString
       val data = sparkSession.read.parquet(dataPath)
+      val Row(idf: Vector) = MLUtils.convertVectorColumnsToML(data, "idf")
         .select("idf")
         .head()
-      val idf = data.getAs[Vector](0)
       val model = new IDFModel(metadata.uid, new feature.IDFModel(OldVectors.fromML(idf)))
       DefaultParamsReader.getAndSetParams(model, metadata)
       model

mllib/src/main/scala/org/apache/spark/ml/feature/MinMaxScaler.scala

@@ -28,6 +28,7 @@ import org.apache.spark.ml.util._
 import org.apache.spark.mllib.linalg.{Vector => OldVector, Vectors => OldVectors}
 import org.apache.spark.mllib.linalg.VectorImplicits._
 import org.apache.spark.mllib.stat.Statistics
+import org.apache.spark.mllib.util.MLUtils
 import org.apache.spark.rdd.RDD
 import org.apache.spark.sql._
 import org.apache.spark.sql.functions._
@@ -232,9 +233,11 @@ object MinMaxScalerModel extends MLReadable[MinMaxScalerModel] {
     override def load(path: String): MinMaxScalerModel = {
       val metadata = DefaultParamsReader.loadMetadata(path, sc, className)
       val dataPath = new Path(path, "data").toString
-      val Row(originalMin: Vector, originalMax: Vector) = sparkSession.read.parquet(dataPath)
-        .select("originalMin", "originalMax")
-        .head()
+      val data = sparkSession.read.parquet(dataPath)
+      val Row(originalMin: Vector, originalMax: Vector) =
+        MLUtils.convertVectorColumnsToML(data, "originalMin", "originalMax")
+          .select("originalMin", "originalMax")
+          .head()
       val model = new MinMaxScalerModel(metadata.uid, originalMin, originalMax)
       DefaultParamsReader.getAndSetParams(model, metadata)
       model

mllib/src/main/scala/org/apache/spark/ml/feature/StandardScaler.scala

@@ -28,6 +28,7 @@ import org.apache.spark.ml.util._
 import org.apache.spark.mllib.feature
 import org.apache.spark.mllib.linalg.{Vector => OldVector, Vectors => OldVectors}
 import org.apache.spark.mllib.linalg.VectorImplicits._
+import org.apache.spark.mllib.util.MLUtils
 import org.apache.spark.rdd.RDD
 import org.apache.spark.sql._
 import org.apache.spark.sql.functions._
@@ -211,7 +212,8 @@ object StandardScalerModel extends MLReadable[StandardScalerModel] {
     override def load(path: String): StandardScalerModel = {
       val metadata = DefaultParamsReader.loadMetadata(path, sc, className)
       val dataPath = new Path(path, "data").toString
-      val Row(std: Vector, mean: Vector) = sparkSession.read.parquet(dataPath)
+      val data = sparkSession.read.parquet(dataPath)
+      val Row(std: Vector, mean: Vector) = MLUtils.convertVectorColumnsToML(data, "std", "mean")
         .select("std", "mean")
         .head()
       val model = new StandardScalerModel(metadata.uid, std, mean)