Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/993#discussion_r13479850
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/aggregates.scala ---
@@ -0,0 +1,175 @@
+/*
+ * 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.sql.execution
+
+import org.apache.spark.SparkContext
+import org.apache.spark.sql.catalyst.errors._
+import org.apache.spark.sql.catalyst.expressions._
+import org.apache.spark.sql.catalyst.plans.physical._
+import org.apache.spark.sql.catalyst.types._
+
+/**
+ * Attempt to rewrite aggregate to be more efficient.
+ *
+ * @param partial if true then aggregation is done partially on local data
without shuffling to
+ * ensure all values where `groupingExpressions` are equal
are present.
+ * @param groupingExpressions expressions that are evaluated to determine
grouping.
+ * @param aggregateExpressions expressions that are computed for each
group.
+ * @param child the input data source.
+ */
+case class HashAggregate(
--- End diff --
Is this just a rewrite of Aggregate?
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