Github user jackylk commented on a diff in the pull request:
https://github.com/apache/carbondata/pull/958#discussion_r119290612
--- Diff:
core/src/main/java/org/apache/carbondata/core/indexstore/DataMap.java ---
@@ -0,0 +1,105 @@
+/*
+ * 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.indexstore;
+
+import java.util.Comparator;
+import java.util.Iterator;
+
+import org.apache.carbondata.core.indexstore.row.DataMapKey;
+import org.apache.carbondata.core.indexstore.row.DataMapRow;
+import org.apache.carbondata.core.indexstore.schema.DataMapRowSchema;
+
+/**
+ * Interface for adding and retrieving index data.
+ */
+public interface DataMap {
+
+ /**
+ * Schema of the index key and its attributes. It should be called only
once after creating
+ * the instance.
+ *
+ * @param schema
+ */
+ void init(DataMapRowSchema schema);
+
+ /**
+ * Add the index row to the in-memory store.
+ *
+ * @param row
+ */
+ void addIndex(DataMapRow row);
--- End diff --
I feel it is better to separate DataMap building interface and other
functional interface.
You can refer to `IndexLoader` in master (not used), andI think after we
have `DataMapBuilder` interface, `IndexLoader` can be removed.
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