Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/15945#discussion_r100666653
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/MergePartialAggregate.scala
---
@@ -0,0 +1,96 @@
+/*
+ * 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.aggregate
+
+import org.apache.spark.sql.catalyst.expressions.aggregate._
+import org.apache.spark.sql.catalyst.rules.Rule
+import org.apache.spark.sql.execution.SparkPlan
+
+
+/**
+ * A pattern that finds a aggregate pair: a partial aggregate and its
parent.
+ */
+object AggregatePair {
+
+ def unapply(plan: SparkPlan): Option[(AggregateExec, AggregateExec)] =
plan match {
+ case outer: AggregateExec if outer.child.isInstanceOf[AggregateExec] =>
+ val inner = outer.child.asInstanceOf[AggregateExec]
+
+ // Check if classes and grouping keys are the same with each other
to make sure the two
+ // aggregates are for the same group by a GROUP-BY clause.
+ if (outer.getClass.isAssignableFrom(inner.getClass) &&
--- End diff --
fixed
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