Github user hotou commented on a diff in the pull request:
https://github.com/apache/spark/pull/4804#discussion_r25552968
--- Diff:
core/src/test/java/org/apache/spark/util/collection/TestTimSort.java ---
@@ -0,0 +1,133 @@
+/*
+ * 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.util.collection;
+
+import java.util.*;
+
+/**
+ * This codes generates a int array which fails the standard TimSort.
+ *
+ * The blog that reported the bug
+ * http://www.envisage-project.eu/timsort-specification-and-verification/
+ *
+ * The algorithms to reproduce the bug is obtained from the reporter of
the bug
+ * https://github.com/abstools/java-timsort-bug
+ *
+ * Licensed under Apache License 2.0
+ * https://github.com/abstools/java-timsort-bug/blob/master/LICENSE
--- End diff --
Well, it's not a exact copy, I made changes to the original codes.
Do you guys have a IntelliJ style that I can import ?
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