Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/4925#discussion_r25985633
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/attribute/AttributeGroup.scala ---
@@ -0,0 +1,234 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.ml.attribute
+
+import scala.collection.mutable.ArrayBuffer
+
+import org.apache.spark.mllib.linalg.VectorUDT
+import org.apache.spark.sql.types.{Metadata, MetadataBuilder, StructField}
+
+/**
+ * Attributes that describe a vector ML column.
+ *
+ * @param name name of the attribute group (the ML column name)
+ * @param numAttributes optional number of attributes. At most one of
`numAttributes` and `attrs`
+ * can be defined.
+ * @param attrs optional array of attributes. Attribute will be copied
with their corresponding
+ * indices in the array.
+ */
+class AttributeGroup private (
--- End diff --
OK if this is the abstraction for a vector-valued column, what is the
abstraction for the overall set of features? Let's say I have two numeric
columns and one vector-valued column -- where is that represented?
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