[KYUUBI #3228] [Subtask] Connectors for Spark SQL Query Engine -> TPC-DS

### _Why are the changes needed?_

Document Kyuubi Spark TPC-DS connector

### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible

- [x] Add screenshots for manual tests if appropriate
<img width="819" alt="image" src="https://user-images.githubusercontent.com/26535726/184519770-f2abcc0a-70af-4dd6-b592-3510db9c1bec.png">

- [ ] [Run test](https://kyuubi.apache.org/docs/latest/develop_tools/testing.html#running-tests) locally before make a pull request

Closes #3228 from pan3793/tpcds-doc.

Closes #3228

0cafdf8 [Cheng Pan] [Subtask] Connectors for Spark SQL Query Engine -> TPC-DS

Authored-by: Cheng Pan <chengpan@apache.org>
Signed-off-by: Cheng Pan <chengpan@apache.org>

Author: pan3793

docs/connector/spark/tpcds.rst

@@ -0,0 +1,108 @@
+.. 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.
+
+TPC-DS
+=====
+
+The TPC-DS is a decision support benchmark. It consists of a suite of business oriented ad-hoc queries and concurrent
+data modifications. The queries and the data populating the database have been chosen to have broad industry-wide
+relevance.
+
+.. tip::
+   This article assumes that you have mastered the basic knowledge and operation of `TPC-DS`_.
+   For the knowledge about TPC-DS not mentioned in this article, you can obtain it from its `Official Documentation`_.
+
+This connector can be used to test the capabilities and query syntax of Spark without configuring access to an external
+data source. When you query a TPC-DS table, the connector generates the data on the fly using a deterministic algorithm.
+
+Goto `Try Kyuubi`_ to explore TPC-DS data instantly!
+
+TPC-DS Integration
+------------------
+
+To enable the integration of kyuubi spark sql engine and TPC-DS through
+Apache Spark Datasource V2 and Catalog APIs, you need to:
+
+- Referencing the TPC-DS connector :ref:`dependencies<spark-tpcds-deps>`
+- Setting the spark catalog :ref:`configurations<spark-tpcds-conf>`
+
+.. _spark-tpcds-deps:
+
+Dependencies
+************
+
+The **classpath** of kyuubi spark sql engine with TPC-DS supported consists of
+
+1. kyuubi-spark-sql-engine-\ |release|\ _2.12.jar, the engine jar deployed with Kyuubi distributions
+2. a copy of spark distribution
+3. kyuubi-spark-connector-tpcds-\ |release|\ _2.12.jar, which can be found in the `Maven Central`_
+
+In order to make the TPC-DS connector package visible for the runtime classpath of engines, we can use one of these methods:
+
+1. Put the TPC-DS connector package into ``$SPARK_HOME/jars`` directly
+2. Set spark.jars=kyuubi-spark-connector-tpcds-\ |release|\ _2.12.jar
+
+.. _spark-tpcds-conf:
+
+Configurations
+**************
+
+To add TPC-DS tables as a catalog, we can set the following configurations in ``$SPARK_HOME/conf/spark-defaults.conf``:
+
+.. code-block:: properties
+
+   # (required) Register a catalog named `tpcds` for the spark engine.
+   spark.sql.catalog.tpcds=org.apache.kyuubi.spark.connector.tpcds.TPCDSCatalog
+
+   # (optional) Excluded database list from the catalog, all available databases are:
+   #            sf0, tiny, sf1, sf10, sf30, sf100, sf300, sf1000, sf3000, sf10000, sf30000, sf100000.
+   spark.sql.catalog.tpcds.excludeDatabases=sf10000,sf30000
+
+   # (optional) When true, use CHAR/VARCHAR, otherwise use STRING. It affects output of the table schema,
+   #            e.g. `SHOW CREATE TABLE <table>`, `DESC <table>`.
+   spark.sql.catalog.tpcds.useAnsiStringType=false
+
+   # (optional) TPCDS changed table schemas in v2.6.0, turn off this option to use old table schemas.
+   #            See detail at: https://www.tpc.org/tpc_documents_current_versions/pdf/tpc-ds_v3.2.0.pdf
+   spark.sql.catalog.tpcds.useTableSchema_2_6=true
+
+   # (optional) Maximum bytes per task, consider reducing it if you want higher parallelism.
+   spark.sql.catalog.tpcds.read.maxPartitionBytes=128m
+
+TPC-DS Operations
+----------------
+
+Listing databases under `tpcds` catalog.
+
+.. code-block:: sql
+
+   SHOW DATABASES IN tpcds;
+
+Listing tables under `tpcds.sf1` database.
+
+.. code-block:: sql
+
+   SHOW TABLES IN tpcds.sf1;
+
+Switch current database to `tpcds.sf1` and run a query against it.
+
+.. code-block:: sql
+
+   USE tpcds.sf1;
+   SELECT * FROM orders;
+
+.. _Official Documentation: https://www.tpc.org/tpcds/
+.. _Try Kyuubi: https://try.kyuubi.cloud/
+.. _Maven Central: https://repo1.maven.org/maven2/org/apache/kyuubi/kyuubi-spark-connector-tpcds_2.12/