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### _Why are the changes needed?_ Build the content for extension points documentation, pre-work for #3100 <img width="1767" alt="image" src="https://user-images.githubusercontent.com/8326978/179930987-1accbbb7-e804-4230-871f-6c4b1152f4a1.png"> 1. the extensions are divided into 2: server side and engine side extensions. (Do we have client side extension support?) 2. the server side authentication page is cross-referenced by the security section, see 1 in the picture. 3. the engine side ones are grouped by different compute frameworks. 4. connector is one type of extension, so we cross-reference the connector pages directly, see 2 & 3 in the picture. ### _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 - [x] [Run test](https://kyuubi.apache.org/docs/latest/develop_tools/testing.html#running-tests) locally before make a pull request Closes #3103 from yaooqinn/3101. Closes #3101 a9ae3e32 [Kent Yao] [KYUUBI #3101] [Subtask][#3100] Build content for extension points documentation 3b7367e9 [Kent Yao] [KYUUBI #3101] [Subtask][#3100] Build content for extension points documentation b5eda13e [Kent Yao] [KYUUBI #3101] [Subtask][#3100] Build content for extension points documentation Authored-by: Kent Yao <yao@apache.org> Signed-off-by: Kent Yao <yao@apache.org>
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Auxiliary SQL Functions
Kyuubi provides several auxiliary SQL functions as supplement to Spark's Built-in Functions
| Name | Description | Return Type | Since |
|---|---|---|---|
| kyuubi_version | Return the version of Kyuubi Server | string | 1.3.0 |
| engine_name | Return the spark application name for the associated query engine | string | 1.3.0 |
| engine_id | Return the spark application id for the associated query engine | string | 1.4.0 |
| system_user | Return the system user name for the associated query engine | string | 1.3.0 |
| session_user | Return the session username for the associated query engine | string | 1.4.0 |