Github user ravipesala commented on a diff in the pull request:
https://github.com/apache/carbondata/pull/1359#discussion_r139059518
--- Diff:
examples/spark2/src/main/scala/org/apache/carbondata/examples/MinMaxDataMapFactory.java
---
@@ -0,0 +1,141 @@
+/*
+ * 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.examples;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.apache.carbondata.core.cache.Cache;
+import org.apache.carbondata.core.cache.CacheProvider;
+import org.apache.carbondata.core.cache.CacheType;
+import org.apache.carbondata.core.datamap.DataMapDistributable;
+import org.apache.carbondata.core.datamap.DataMapMeta;
+import org.apache.carbondata.core.datamap.TableDataMap;
+import org.apache.carbondata.core.datamap.dev.DataMap;
+import org.apache.carbondata.core.datamap.dev.DataMapFactory;
+import org.apache.carbondata.core.datamap.dev.DataMapWriter;
+import org.apache.carbondata.core.datastore.filesystem.CarbonFile;
+import org.apache.carbondata.core.datastore.filesystem.CarbonFileFilter;
+import org.apache.carbondata.core.datastore.impl.FileFactory;
+import org.apache.carbondata.core.events.ChangeEvent;
+import
org.apache.carbondata.core.indexstore.TableBlockIndexUniqueIdentifier;
+import org.apache.carbondata.core.indexstore.blockletindex.BlockletDataMap;
+import org.apache.carbondata.core.indexstore.schema.FilterType;
+import org.apache.carbondata.core.memory.MemoryException;
+import org.apache.carbondata.core.metadata.AbsoluteTableIdentifier;
+
+
+/**
+ * Table map for blocklet
+ */
+public class MinMaxDataMapFactory implements DataMapFactory {
+
+ private AbsoluteTableIdentifier identifier;
+
+ // segmentId -> list of index file
+ private Map<String, List<TableBlockIndexUniqueIdentifier>> segmentMap =
new HashMap<>();
+
+ private Cache<TableBlockIndexUniqueIdentifier, DataMap> cache;
+
+ @Override
+ public void init(AbsoluteTableIdentifier identifier, String dataMapName)
{
+ this.identifier = identifier;
+ cache = CacheProvider.getInstance()
--- End diff --
what is the use of this cache when don't use anywhere
---
