Github user jackylk commented on a diff in the pull request:
https://github.com/apache/incubator-carbondata/pull/310#discussion_r92760025
--- Diff: core/src/main/java/org/apache/carbondata/core/dictionary/generator/TableDictionaryGenerator.java ---
@@ -0,0 +1,110 @@
+/*
+ * 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;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.*;
+
+import org.apache.carbondata.common.logging.LogService;
+import org.apache.carbondata.common.logging.LogServiceFactory;
+import org.apache.carbondata.core.carbon.metadata.CarbonMetadata;
+import org.apache.carbondata.core.carbon.metadata.schema.table.CarbonTable;
+import org.apache.carbondata.core.carbon.metadata.schema.table.column.CarbonDimension;
+import org.apache.carbondata.core.constants.CarbonCommonConstants;
+import org.apache.carbondata.core.devapi.BiDictionary;
+import org.apache.carbondata.core.devapi.DictionaryGenerationException;
+import org.apache.carbondata.core.devapi.DictionaryGenerator;
+import org.apache.carbondata.core.dictionary.generator.key.DictionaryKey;
+import org.apache.carbondata.core.util.CarbonProperties;
+
+/**
+ * Dictionary generation for table.
+ */
+public class TableDictionaryGenerator
+ implements DictionaryGenerator<Integer, DictionaryKey>, DictionaryWriter {
+
+ private static final LogService LOGGER =
+ LogServiceFactory.getLogService(TableDictionaryGenerator.class.getName());
+
+ private Map<String, DictionaryGenerator<Integer, String>> columnMap = new ConcurrentHashMap<>();
--- End diff --
What is the key and value of this map, please add description.
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