Github user huaxingao commented on a diff in the pull request:
https://github.com/apache/spark/pull/21710#discussion_r203229835
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/r/PrefixSpanWrapper.scala ---
@@ -0,0 +1,42 @@
+/*
+ * 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.ml.r
+
+import org.apache.spark.ml.fpm.PrefixSpan
+import org.apache.spark.sql.{DataFrame, Dataset}
+
+private[r] class PrefixSpanWrapper private (val prefixSpan: PrefixSpan) {
--- End diff --
You are right. I will remove
```
private[r] class PrefixSpanWrapper private (val prefixSpan: PrefixSpan) {
def findFrequentSequentialPatterns(dataset: Dataset[_]): DataFrame = {
prefixSpan.findFrequentSequentialPatterns(dataset)
}
}
```
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