Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/1297#discussion_r14799543
--- Diff: core/src/main/scala/org/apache/spark/rdd/IndexedRDD.scala ---
@@ -0,0 +1,82 @@
+/*
+ * 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.rdd
+
+import scala.language.higherKinds
+import scala.reflect.{classTag, ClassTag}
+
+import org.apache.spark._
+import org.apache.spark.SparkContext._
+import org.apache.spark.storage.StorageLevel
+
+import IndexedRDD.Id
+
+/**
+ * :: Experimental ::
+ * An RDD of key-value `(Id, V)` pairs that enforces key uniqueness and
pre-indexes the entries for
+ * efficient joins and point lookups/updates. Two IndexedRDDs with the
same index can be joined
+ * efficiently. All operations except [[reindex]] preserve the index. To
construct an `IndexedRDD`,
+ * use the [[org.apache.spark.rdd.IndexedRDD$ IndexedRDD object]].
+ *
+ * @tparam V the value associated with each entry in the set.
+ */
+class IndexedRDD[@specialized(Long, Int, Double) V: ClassTag]
--- End diff --
Could you add the @experimental annotation here too?
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