cloud-fan commented on code in PR #42223:
URL: https://github.com/apache/spark/pull/42223#discussion_r1280720164


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sql/core/src/test/scala/org/apache/spark/sql/execution/benchmark/CombineJoinedAggregatesBenchmark.scala:
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@@ -0,0 +1,120 @@
+/*
+ * 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.benchmark
+
+import org.apache.spark.benchmark.Benchmark
+import org.apache.spark.sql.internal.SQLConf.COMBINE_JOINED_AGGREGATES_ENABLED
+
+/**
+ * Benchmark to measure performance for [[CombineJoinedAggregates]] 
computation.
+ * To run this benchmark:
+ * {{{
+ *   1. without sbt: bin/spark-submit --class <this class>
+ *      --jars <spark core test jar>,<spark catalyst test jar> <spark sql test 
jar>
+ *   2. build/sbt "sql/test:runMain <this class>"
+ *   3. generate result: SPARK_GENERATE_BENCHMARK_FILES=1 build/sbt 
"sql/test:runMain <this class>"
+ *      Results will be written to
+ *      "benchmarks/CombineJoinedAggregatesBenchmark-results.txt".
+ * }}}
+ */
+object CombineJoinedAggregatesBenchmark extends SqlBasedBenchmark {

Review Comment:
   We don't really need to add microbenchmark for optimizer features. The plan 
change is sufficient to show the benefits. You can keep the benchmark locally 
to show the perf numbers.



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