Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/7972#discussion_r36363024
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/feature/VectorSlicer.scala ---
@@ -0,0 +1,182 @@
+/*
+ * 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.feature
+
+import org.apache.spark.annotation.Experimental
+import org.apache.spark.ml.Transformer
+import org.apache.spark.ml.attribute.{Attribute, AttributeGroup}
+import org.apache.spark.ml.param.shared.{HasInputCol, HasOutputCol}
+import org.apache.spark.ml.param.{IntArrayParam, ParamMap,
StringArrayParam}
+import org.apache.spark.ml.util.{Identifiable, SchemaUtils}
+import org.apache.spark.mllib.linalg._
+import org.apache.spark.sql.DataFrame
+import org.apache.spark.sql.functions._
+import org.apache.spark.sql.types.StructType
+
+/**
+ * :: Experimental ::
+ * This class takes a feature vector and outputs a new feature vector with
a subarray of the
+ * original features.
+ * The subset of features can be specified with either indices
([[setSelectedIndices()]])
+ * or names ([[setSelectedNames()]]). At least one feature must be
selected.
+ * The output vector will order features with the selected indices first
(in the order given),
+ * followed by the selected names (in the order given).
--- End diff --
Document the behavior when there are overlaps between features by index and
by name, though it is in the param doc.
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