niuge01 commented on a change in pull request #3720:
URL:
https://github.com/apache/carbondata/pull/3720#discussion_r411128053##########
File path: docs/mv-guide.md
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+<!--
+ 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.
+-->
+
+# CarbonData Materialized View
+
+* [Quick Example](#quick-example)
+* [Introduction](#introduction)
+* [Loading Data](#loading-data)
+* [Querying Data](#querying-data)
+* [Compaction](#compacting)
+* [Data Management](#data-management)
+* [Time Series Support](#time-series-support)
+* [Time Series RollUp Support](#time-series-rollup-support)
+
+## Quick example
+
+ Start spark-sql in terminal and run the following queries,
+
+ ```
+ CREATE TABLE maintable(a int, b string, c int) stored as carbondata;
+ INSERT INTO maintable SELECT 1, 'ab', 2;
+ CREATE MATERIALIZED VIEW view1 AS SELECT a, sum(b) FROM maintable GROUP BY a;
+ SELECT a, sum(b) FROM maintable GROUP BY a;
+ // NOTE: run explain query and check if query hits the Index table from the plan
+ EXPLAIN SELECT a, sum(b) FROM maintable GROUP BY a;
+ ```
+
+## Introduction
+
+ Materialized views are created as sub-queries. User can create limitless materialized view to
+ improve query performance provided the storage requirements and loading time is acceptable.
+
+ Materialized view can refreshed on commit or on manual. Once materialized views are created,
+ CarbonData's CarbonAnalyzer helps to select the most efficient materialized view based on
Review comment:
OK
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