docs: add explain perf (#2463)

* docs: add `explain perf`

* update

* update

* Update 04-how-to-profiling.md

* Update 04-how-to-profiling.md

* Update explain-perf.md add introduce version

* fix

* Update 04-how-to-profiling.md

---------

Co-authored-by: Bohu <[email protected]>

Author: dqhl76

docs/en/developer/20-community/00-contributor/04-how-to-profiling.md

@@ -11,6 +11,10 @@ go tool pprof -http="0.0.0.0:8081" http://localhost:8080/debug/pprof/profile?sec
 Open `<your-ip>:8081` and select `Flame Graph` from the VIEW menus in the site header:
 <img src="https://user-images.githubusercontent.com/172204/208336392-5b64bb9b-cce8-4562-9e05-c3d538e9d8a6.png"/>
 
+## Query Level CPU Profiling
+
+`EXPLAIN PERF <statement>` can also be used for CPU profiling, which focuses on a specific query and gathers CPU profiling data from other nodes to help analyze query performance. Check [EXPLAIN PERF](/sql/sql-commands/explain-cmds/explain-perf) for more details.
+
 ## Memory profiling
 
 `databend-query` and `databend-meta` can be built optionally with `jemalloc`,

docs/en/sql-reference/10-sql-commands/40-explain-cmds/explain-perf.md

@@ -0,0 +1,31 @@
+---
+title: EXPLAIN PERF
+---
+
+import FunctionDescription from '@site/src/components/FunctionDescription';
+import Tabs from '@theme/Tabs';
+import TabItem from '@theme/TabItem';
+
+<FunctionDescription description="Introduced or updated: v1.2.765"/>
+
+`EXPLAIN PERF` captures stack traces to perform CPU profiling. This command returns an HTML file containing flame graphs generated from data collected from all nodes in the current cluster. You can directly open this HTML file in your browser.
+
+It is helpful to analyze query performance and help identify bottlenecks.
+
+## Syntax
+
+```sql
+EXPLAIN PERF <statement>
+```
+
+## Examples
+
+```shell
+bendsql --quote-style never --query="EXPLAIN PERF SELECT avg(number) FROM numbers(10000000)" > demo.html
+```
+
+Then, you can open the `demo.html` file in your browser to view the flame graphs:
+
+<img src="https://github.com/user-attachments/assets/07acfefa-a1c3-4c00-8c43-8ca1aafc3224"/>
+
+If the query finishes very quickly, it may not collect enough data, resulting in an empty flame graph.