[doc] Add REST catalog doc

docs/README.md

@@ -10,6 +10,9 @@ that you always have docs corresponding to your checked-out version.
 
 Make sure you have installed Hugo on your system.
 Note: An extended version of Hugo <= 0.124.1 is required. you can Find this at [Hugo](https://github.com/gohugoio/hugo/releases/tag/v0.124.1)
+```sh
+go install -tags extended,withdeploy github.com/gohugoio/hugo@v0.124.1
+```
 
 From this directory:
 

docs/content/concepts/catalog.md

@@ -32,11 +32,12 @@ access the Paimon table.
 
 ## Catalogs
 
-Paimon catalogs currently support three types of metastores:
+Paimon catalogs currently support four types of metastores:
 
 * `filesystem` metastore (default), which stores both metadata and table files in filesystems.
 * `hive` metastore, which additionally stores metadata in Hive metastore. Users can directly access the tables from Hive.
 * `jdbc` metastore, which additionally stores metadata in relational databases such as MySQL, Postgres, etc.
+* `rest` metastore, which is designed to provide a lightweight way to access any catalog backend from a single client.
 
 ## Filesystem Catalog
 
@@ -88,3 +89,6 @@ CREATE CATALOG my_jdbc WITH (
     'warehouse' = 'hdfs:///path/to/warehouse'
 );
 ```
+## REST Catalog
+By using the Paimon REST catalog, changes to the catalog will be directly stored in a remote catalog server which exposed through REST API.
+See [Paimon REST Catalog]({{< ref "concepts/rest-catalog" >}}).

docs/content/concepts/data-types.md

@@ -1,6 +1,6 @@
 ---
 title: "Data Types"
-weight: 7
+weight: 8
 type: docs
 aliases:
 - /concepts/data-types.html

docs/content/concepts/rest-catalog.md

@@ -0,0 +1,88 @@
+---
+title: "RESTCatalog"
+weight: 5
+type: docs
+aliases:
+- /concepts/rest-catalog.html
+---
+<!--
+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.
+-->
+
+# RESTCatalog
+## Overview
+
+Paimon REST Catalog provides a lightweight implementation to access the catalog service. Paimon could access the catalog service through a catalog server which implements REST API.You can see all APIs in [REST API](https://github.com/apache/paimon/blob/master/paimon-open-api/rest-catalog-open-api.yaml).
+
+{{< img src="/img/rest-catalog.svg">}}
+
+## Key Features
+
+1. User Defined Technology-Specific Logic Implementation
+  - All technology-specific logic within the catalog server. 
+  - This ensures that the user can define logic that could be owned by the user.
+2. Decoupled Architecture
+  - The REST Catalog interacts with the catalog server through a well-defined REST API. 
+  - This decoupling allows for independent evolution and scaling of the catalog server and clients.
+3. Language Agnostic
+  - Developers can implement the catalog server in any programming language, provided that it adheres to the specified REST API.
+  - This flexibility enables teams to utilize their existing tech stacks and expertise.
+4. Support for Any Catalog Backend
+  - Paimon REST Catalog is designed to work with any catalog backend. 
+  - As long as they implement the relevant APIs, they can seamlessly integrate with Paimon REST Catalog.
+
+## Usage
+- Bear token
+```sql
+CREATE CATALOG `paimon-rest-catalog`
+WITH (
+'type' = 'paimon',
+'uri' = '<catalog server url>',
+'metastore' = 'rest',
+'token.provider' = 'bear'
+'token' = '<token>'
+);
+```
+- DLF ak
+```sql
+CREATE CATALOG `paimon-rest-catalog`
+WITH (
+'type' = 'paimon',
+'uri' = '<catalog server url>',
+'metastore' = 'rest',
+'token.provider' = 'dlf',
+'dlf.accessKeyId'='<accessKeyId>',
+'dlf.accessKeySecret'='<accessKeySecret>',
+);
+```
+- DLF token path
+```sql
+CREATE CATALOG `paimon-rest-catalog`
+WITH (
+'type' = 'paimon',
+'uri' = '<catalog server url>',
+'metastore' = 'rest',
+'token.provider' = 'dlf',
+'dlf.token-path' = '<token-path>'
+);
+```
+
+## Conclusion
+
+Paimon REST Catalog offers adaptable solution for accessing the catalog service. According to [REST API](https://github.com/apache/paimon/blob/master/paimon-open-api/rest-catalog-open-api.yaml) is decoupled from the catalog service.
+Technology-specific Logic is encapsulated on the catalog server. At the same time, the catalog server supports any backend and languages.

docs/content/concepts/spec/_index.md

@@ -1,7 +1,7 @@
 ---
 title: Specification
 bookCollapseSection: true
-weight: 8
+weight: 9
 ---
 <!--
 Licensed to the Apache Software Foundation (ASF) under one

docs/content/concepts/system-tables.md

@@ -1,6 +1,6 @@
 ---
 title: "System Tables"
-weight: 6
+weight: 7
 type: docs
 aliases:
 - /concepts/system-tables.html

docs/content/concepts/table-types.md

@@ -1,6 +1,6 @@
 ---
 title: "Table Types"
-weight: 5
+weight: 6
 type: docs
 aliases:
 - /concepts/table-types.html