walterddr commented on a change in pull request #9576: [FLINK-13915][ml] Add 
several base classes of summarizer.
URL: https://github.com/apache/flink/pull/9576#discussion_r363895094
 
 

 ##########
 File path: 
flink-ml-parent/flink-ml-lib/src/main/java/org/apache/flink/ml/operator/common/statistics/basicstatistic/CorrelationResult.java
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 @@ -0,0 +1,68 @@
+/*
+ * 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.flink.ml.operator.common.statistics.basicstatistic;
+
+import org.apache.flink.ml.common.linalg.DenseMatrix;
+import org.apache.flink.ml.common.utils.TableUtil;
+import org.apache.flink.types.Row;
+
+import java.util.ArrayList;
+
+/**
+ * It is correlation result, which has colNames and correlation values.
+ */
+public class CorrelationResult {
 
 Review comment:
   This class seems to be a fit for an inner class of 
basesummarizer/basesummary ? I do not see this class being used outside of the 
summary perspective. 
   
   Althought the toString() part can be a Utility function for DenseMatrix IMO 
and can be factor out?

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