Github user jackylk commented on a diff in the pull request:
https://github.com/apache/incubator-carbondata/pull/310#discussion_r94132843
--- Diff: core/src/main/java/org/apache/carbondata/core/dictionary/generator/key/DictionaryKey.java ---
@@ -0,0 +1,92 @@
+/*
+ * 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.carbondata.core.dictionary.generator.key;
+
+import java.io.Serializable;
+
+/**
+ * Dictionary key to generate dictionary
+ */
+public class DictionaryKey implements Serializable {
+
+ /**
+ * tableUniqueName
+ */
+ private String tableUniqueName;
+
+ /**
+ * columnName
+ */
+ private String columnName;
+
+ /**
+ * message data
+ */
+ private Object data;
+
+ /**
+ * message type
+ */
+ private String type;
--- End diff --
please use a Enum to represent message type
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