Github user jackylk commented on a diff in the pull request:
https://github.com/apache/carbondata/pull/1238#discussion_r131799961
--- Diff: core/src/main/java/org/apache/carbondata/core/datamap/dev/DataMapWriter.java ---
@@ -0,0 +1,58 @@
+/*
+ * 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.datamap.dev;
+
+import org.apache.carbondata.core.datamap.DataMapMeta;
+import org.apache.carbondata.core.datastore.page.ColumnPage;
+
+/**
+ * Data Map writer
+ */
+public interface DataMapWriter {
+
+ /**
+ * Start of new block notification.
+ * @param blockId file name of the carbondata file
+ */
+ void onBlockStart(String blockId);
+
+ /**
+ * End of block notification
+ */
+ void onBlockEnd(String blockId);
+
+ /**
+ * Start of new blocklet notification.
+ * @param blockletId sequence number of blocklet in the block
+ */
+ void onBlockletStart(int blockletId);
+
+ /**
+ * End of blocklet notification
+ * @param blockletId sequence number of blocklet in the block
+ */
+ void onBlockletEnd(int blockletId);
+
+ /**
+ * Add the column page row to the datamap
+ * The order of pageId is not guranteed
+ */
+ void add(int blockletId, int pageId, ColumnPage page);
+
+ DataMapMeta getMeta();
--- End diff --
You are right, will change it
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