Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/10174#discussion_r47581335
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/DefaultOptimizerExtendableSuite.scala
---
@@ -0,0 +1,45 @@
+/*
+ * 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.catalyst
+
+import org.apache.spark.SparkFunSuite
+import org.apache.spark.sql.catalyst.optimizer.{DefaultOptimizer,
Optimizer}
+import org.apache.spark.sql.catalyst.plans.logical.LogicalPlan
+import org.apache.spark.sql.catalyst.rules.Batch
+
+/**
+ * This is a test for SPARK-7727 if the Default Optimizer is kept being
extendable
+ */
+class DefaultOptimizerExtendableSuite extends SparkFunSuite{
+
+ /**
+ * This class represents a dummy extended optimizer that takes the
rules of the
+ * DefaultOptimizer and adds custom ones.
+ */
+ class ExtendedOptimizer extends Optimizer{
--- End diff --
Hmm, weird. Github is usually smarter than this.
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