Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/10174#discussion_r48212972
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/OptimizerExtendableSuite.scala
---
@@ -0,0 +1,54 @@
+/*
+ * 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.Optimizer
+import org.apache.spark.sql.catalyst.plans.logical.LogicalPlan
+import org.apache.spark.sql.catalyst.rules.Rule
+
+/**
+ * This is a test for SPARK-7727 if the Optimizer is kept being extendable
+ */
+class OptimizerExtendableSuite extends SparkFunSuite {
+
+ /**
+ * Dummy rule for test batches
+ */
+ object DummyRule extends Rule[LogicalPlan] {
+ def apply(p: LogicalPlan): LogicalPlan = p
+ }
+
+ /**
+ * This class represents a dummy extended optimizer that takes the
batches of the
+ * Optimizer and adds custom ones.
+ */
+ class ExtendedOptimizer extends Optimizer {
+
+ // rules set to DummyRule, would not be executed anyways
+ val myBatches: Seq[Batch] = Batch("once", Once, DummyRule) ::
+ Batch("fixedPoint", FixedPoint(100),
DummyRule) :: Nil
--- End diff --
You can follow `Optimizer` for how to indent these `Batch`es
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