[PR] Add sql federation use document [shardingsphere]

["zihaoAK47 (via GitHub)" <gi...@apache.org>]

zihaoAK47 opened a new pull request, #29778:
URL: https://github.com/apache/shardingsphere/pull/29778

   Fixes #29464.
   
   Changes proposed in this pull request:
     - Add sql federation use document
   
   ---
   
   Before committing this PR, I'm sure that I have checked the following options:
   - [x] My code follows the [code of conduct](https://shardingsphere.apache.org/community/en/involved/conduct/code/) of this project.
   - [x] I have self-reviewed the commit code.
   - [x] I have (or in comment I request) added corresponding labels for the pull request.
   - [x] I have passed maven check locally : `./mvnw clean install -B -T1C -Dmaven.javadoc.skip -Dmaven.jacoco.skip -e`.
   - [x] I have made corresponding changes to the documentation.
   - [x] I have added corresponding unit tests for my changes.
   


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Re: [PR] Add sql federation use document [shardingsphere]

["strongduanmu (via GitHub)" <gi...@apache.org>]

strongduanmu merged PR #29778:
URL: https://github.com/apache/shardingsphere/pull/29778


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Re: [PR] Add sql federation use document [shardingsphere]

["strongduanmu (via GitHub)" <gi...@apache.org>]

strongduanmu commented on code in PR #29778:
URL: https://github.com/apache/shardingsphere/pull/29778#discussion_r1459015711


##########
docs/document/content/user-manual/shardingsphere-jdbc/yaml-config/rules/sql-federation.cn.md:
##########
@@ -0,0 +1,35 @@
++++
+title = "联邦查询"
+weight = 13
++++
+
+## 背景信息
+
+该项功能为**实验性功能**。

Review Comment:
   `该功能为实验性功能，暂不适合核心系统生产环境使用。` may be better.



##########
docs/document/content/user-manual/shardingsphere-jdbc/java-api/rules/sql-federation.cn.md:
##########
@@ -0,0 +1,45 @@
++++
+title = "联邦查询"
+weight = 13
++++
+
+## 背景信息
+
+该项功能为**实验性功能**。

Review Comment:
   `该功能为实验性功能，暂不适合核心系统生产环境使用。` may be better.



##########
docs/document/content/features/sql-federation/_index.cn.md:
##########
@@ -0,0 +1,29 @@
++++
+pre = "<b>3.11. </b>"
+title = "联邦查询"
+weight = 11
+chapter = true
++++
+
+## 背景
+
+当数据分片后数据存在于多个数据库实例中，虽然能够有效应对数据库性能瓶颈，但同时在业务实现上面也带来了一些新的问题。

Review Comment:
   `当用户使用数据分片对海量数据进行水平拆分时，虽然能够有效解决数据库性能瓶颈，但业务上也因此带来了一些新的问题。` may be better.



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