Github user ankurdave commented on a diff in the pull request:
https://github.com/apache/spark/pull/3100#discussion_r20062658
--- Diff: graphx/src/main/scala/org/apache/spark/graphx/TripletFields.scala
---
@@ -0,0 +1,59 @@
+/*
+ * 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.graphx
+
+/**
+ * Represents a subset of the fields of an [[EdgeTriplet]] or
[[EdgeContext]]. This allows the
+ * system to populate only those fields for efficiency.
+ */
+class TripletFields private (
+ val useSrc: Boolean,
+ val useDst: Boolean,
+ val useEdge: Boolean)
--- End diff --
Yeah, we don't currently use it since it's cheap to access the edge
attributes, but I think @jegonzal added it in case our internal representation
changes and it becomes useful.
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