Update system-query-log.md

Author: BohuTANG

docs/doc/30-reference/30-sql/70-system-tables/system-query-log.md

@@ -2,23 +2,71 @@
 title: system.query_log
 ---
 
-A read-only in-memory table stores all the query logs;
+A read-only in-memory table stores all the query logs.
 
-```sql
-SELECT * FROM system.query_log ORDER BY event_time DESC LIMIT 1\G
-*************************** 1. row ***************************
+
+## Columns
+
+```
+CREATE TABLE `query_log` (
+  `log_type` TINYINT,
+  `handler_type` VARCHAR,
+  `tenant_id` VARCHAR,
+  `cluster_id` VARCHAR,
+  `sql_user` VARCHAR,
+  `sql_user_quota` VARCHAR,
+  `sql_user_privileges` VARCHAR,
+  `query_id` VARCHAR,
+  `query_kind` VARCHAR,
+  `query_text` VARCHAR,
+  `event_date` DATE,
+  `event_time` TIMESTAMP(3),
+  `current_database` VARCHAR,
+  `databases` VARCHAR,
+  `tables` VARCHAR,
+  `columns` VARCHAR,
+  `projections` VARCHAR,
+  `written_rows` BIGINT UNSIGNED,
+  `written_bytes` BIGINT UNSIGNED,
+  `written_io_bytes` BIGINT UNSIGNED,
+  `written_io_bytes_cost_ms` BIGINT UNSIGNED,
+  `scan_rows` BIGINT UNSIGNED,
+  `scan_bytes` BIGINT UNSIGNED,
+  `scan_io_bytes` BIGINT UNSIGNED,
+  `scan_io_bytes_cost_ms` BIGINT UNSIGNED,
+  `scan_partitions` BIGINT UNSIGNED,
+  `total_partitions` BIGINT UNSIGNED,
+  `result_rows` BIGINT UNSIGNED,
+  `result_bytes` BIGINT UNSIGNED,
+  `cpu_usage` INT UNSIGNED,
+  `memory_usage` BIGINT UNSIGNED,
+  `client_info` VARCHAR,
+  `client_address` VARCHAR,
+  `exception_code` INT,
+  `exception_text` VARCHAR,
+  `stack_trace` VARCHAR,
+  `server_version` VARCHAR,
+  `session_settings` VARCHAR,
+  `extra` VARCHAR
+)
+```
+
+## Examples
+
+```
+*************************** 4. row ***************************
                 log_type: 1
             handler_type: MySQL
-               tenant_id: test_tenant
-              cluster_id: test_cluster
+               tenant_id: admin
+              cluster_id:
                 sql_user: root
           sql_user_quota: UserQuota<cpu:0,mem:0,store:0>
-     sql_user_privileges: GRANT ALL ON *.* TO 'root'@'127.0.0.1', ROLES: []
-                query_id: da879c17-94bb-4163-b2ac-ff4786bbe69e
-              query_kind: SelectPlan
-              query_text: SELECT * from system.query_log order by event_time desc limit 1
-              event_date: 2022-03-24
-              event_time: 2022-03-24 11:13:27.414
+     sql_user_privileges: GRANT ALL ON *.*, ROLES: []
+                query_id: eda2a82b-3667-4ffb-b436-953785178c39
+              query_kind: Query
+              query_text: select avg(number) from numbers(1000000)
+              event_date: 2022-09-08
+              event_time: 2022-09-08 03:32:39.517
         current_database: default
                databases:
                   tables:
@@ -34,16 +82,50 @@ written_io_bytes_cost_ms: 0
    scan_io_bytes_cost_ms: 0
          scan_partitions: 0
         total_partitions: 0
-             result_rows: 0
-            result_bytes: 0
-               cpu_usage: 10
-            memory_usage: 1603
+
+, skip_header=0, sql_dialect=PostgreSQL, storage_read_buffer_size=1048576, timezone=UTC, unquoted_ident_case_sensitive=0, wait_for_async_insert=1, wait_for_async_insert_timeout=100, scope: SESSION
+                   extra:
+                   
+                   
+*************************** 5. row ***************************
+                log_type: 2
+            handler_type: MySQL
+               tenant_id: admin
+              cluster_id:
+                sql_user: root
+          sql_user_quota: UserQuota<cpu:0,mem:0,store:0>
+     sql_user_privileges: GRANT ALL ON *.*, ROLES: []
+                query_id: eda2a82b-3667-4ffb-b436-953785178c39
+              query_kind: Query
+              query_text: select avg(number) from numbers(1000000)
+              event_date: 2022-09-08
+              event_time: 2022-09-08 03:32:39.519
+        current_database: default
+               databases:
+                  tables:
+                 columns:
+             projections:
+            written_rows: 0
+           written_bytes: 0
+        written_io_bytes: 0
+written_io_bytes_cost_ms: 0
+               scan_rows: 1000000
+              scan_bytes: 8000000
+           scan_io_bytes: 0
+   scan_io_bytes_cost_ms: 0
+         scan_partitions: 0
+        total_partitions: 0
+             result_rows: 1
+            result_bytes: 9
+               cpu_usage: 24
+            memory_usage: 0
              client_info:
-          client_address: 127.0.0.1:56744
+          client_address: 127.0.0.1:53304
           exception_code: 0
           exception_text:
              stack_trace:
           server_version:
-        session_settings: enable_new_processor_framework=1, flight_client_timeout=60, max_block_size=10000, max_threads=8, storage_occ_backoff_init_delay_ms=5, storage_occ_backoff_max_delay_ms=20000, storage_occ_backoff_max_elapsed_ms=120000, storage_read_buffer_size=1048576, scope: SESSION
+        session_settings: compression=None, empty_as_default=1, enable_async_insert=0, enable_new_processor_framework=1, enable_planner_v2=1, field_delimiter=,, flight_client_timeout=60, group_by_two_level_threshold=10000, max_block_size=10000, max_execute_time=0, max_threads=24, quoted_ident_case_sensitive=1, record_delimiter=
+, skip_header=0, sql_dialect=PostgreSQL, storage_read_buffer_size=1048576, timezone=UTC, unquoted_ident_case_sensitive=0, wait_for_async_insert=1, wait_for_async_insert_timeout=100, scope: SESSION
                    extra:
 ```