improve wg and json (#2694)

* improve the COPY INTO table

* improve wg and json

* improve json index

Author: BohuTANG

docs/en/sql-reference/10-sql-commands/00-ddl/20-workload-group/create-workload-group.md

@@ -42,8 +42,11 @@ WITH cpu_quota = '70%', memory_quota = '80%', max_concurrency = 10;
 Users must be assigned to workload groups to enable resource limiting. When users execute queries, the system applies the workload group's restrictions automatically.
 
 ```sql
--- Create and assign user
+-- Create user and grant permissions
 CREATE USER analytics_user IDENTIFIED BY 'password123';
+GRANT ALL ON *.* TO analytics_user;
+
+-- Assign user to workload group
 ALTER USER analytics_user WITH SET WORKLOAD GROUP = 'interactive_queries';
 
 -- Reassign to different workload group

docs/en/sql-reference/10-sql-commands/00-ddl/20-workload-group/index.md

@@ -16,9 +16,15 @@ Workload groups enable resource management and query concurrency control in Data
 -- Create workload group
 CREATE WORKLOAD GROUP analytics WITH cpu_quota = '50%', memory_quota = '30%', max_concurrency = 5;
 
--- Assign user to workload group
+-- Create user and grant permissions
 CREATE USER analyst IDENTIFIED BY 'password';
+GRANT ALL ON *.* TO analyst;
+
+-- Assign user to workload group
 ALTER USER analyst WITH SET WORKLOAD GROUP = 'analytics';
+
+-- Remove user from workload group (user will use default unlimited resources)
+ALTER USER analyst WITH UNSET WORKLOAD GROUP;
 ```
 
 ## Command Reference

docs/en/sql-reference/20-sql-functions/10-semi-structured-functions/0-json/index.md

@@ -37,6 +37,9 @@ This section provides reference information for JSON functions in Databend. JSON
 
 | Function | Description | Example |
 |----------|-------------|---------|
+| [GET](get) | Extracts value from JSON by index or field name | `GET('{"name":"John"}', 'name')` → `"John"` |
+| [GET_IGNORE_CASE](get-ignore-case) | Extracts value with case-insensitive field matching | `GET_IGNORE_CASE('{"Name":"John"}', 'name')` → `"John"` |
+| [GET_PATH](get-path) | Extracts value using path notation | `GET_PATH('{"user":{"name":"John"}}', 'user.name')` → `"John"` |
 | [JSON_EXTRACT_PATH_TEXT](json-extract-path-text) | Extracts text value from JSON using path | `JSON_EXTRACT_PATH_TEXT('{"name":"John"}', 'name')` → `'John'` |
 | [JSON_EACH](json-each) | Expands JSON object into key-value pairs | `JSON_EACH('{"a":1,"b":2}')` → `[("a",1),("b",2)]` |
 | [JSON_ARRAY_ELEMENTS](json-array-elements) | Expands JSON array into individual elements | `JSON_ARRAY_ELEMENTS('[1,2,3]')` → `1, 2, 3` |

docs/en/sql-reference/20-sql-functions/10-semi-structured-functions/index.md

@@ -6,26 +6,44 @@ Structured and semi-structured functions in Databend enable efficient processing
 
 ## JSON Functions
 
+### Parsing & Validation
 | Function | Description | Example |
 |----------|-------------|--------|
 | [PARSE_JSON](json/parse-json) | Parses a JSON string into a variant value | `PARSE_JSON('[1,2,3]')` |
 | [CHECK_JSON](json/check-json) | Validates if a string is valid JSON | `CHECK_JSON('{"a":1}')` |
 | [JSON_TYPEOF](json/json-typeof) | Returns the type of a JSON value | `JSON_TYPEOF(PARSE_JSON('[1,2,3]'))` |
-| [JSON_TO_STRING](json/json-to-string) | Converts a JSON value to a string | `JSON_TO_STRING(PARSE_JSON('{"a":1}'))` |
+
+### Path-based Querying
+| Function | Description | Example |
+|----------|-------------|--------|
 | [JSON_PATH_EXISTS](json/json-path-exists) | Checks if a JSON path exists | `JSON_PATH_EXISTS(json_obj, '$.name')` |
-| [JSON_PATH_MATCH](json/json-path-match) | Matches JSON values against a path pattern | `JSON_PATH_MATCH(json_obj, '$.age')` |
 | [JSON_PATH_QUERY](json/json-path-query) | Queries JSON data using JSONPath | `JSON_PATH_QUERY(json_obj, '$.items[*]')` |
 | [JSON_PATH_QUERY_ARRAY](json/json-path-query-array) | Queries JSON data and returns results as an array | `JSON_PATH_QUERY_ARRAY(json_obj, '$.items')` |
 | [JSON_PATH_QUERY_FIRST](json/json-path-query-first) | Returns the first result from a JSON path query | `JSON_PATH_QUERY_FIRST(json_obj, '$.items[*]')` |
-| [JSON_EXTRACT_PATH_TEXT](json/json-extract-path-text) | Extracts text value from JSON using path | `JSON_EXTRACT_PATH_TEXT(json_obj, 'name')` |
+| [JSON_PATH_MATCH](json/json-path-match) | Matches JSON values against a path pattern | `JSON_PATH_MATCH(json_obj, '$.age')` |
+| [JQ](json/jq) | Advanced JSON processing using jq syntax | `JQ('.name', json_obj)` |
+
+### Value Extraction
+| Function | Description | Example |
+|----------|-------------|--------|
 | [GET](json/get) | Gets a value from a JSON object by key or array by index | `GET(PARSE_JSON('[1,2,3]'), 0)` |
 | [GET_PATH](json/get-path) | Gets a value from a JSON object using a path expression | `GET_PATH(json_obj, 'user.name')` |
 | [GET_IGNORE_CASE](json/get-ignore-case) | Gets a value with case-insensitive key matching | `GET_IGNORE_CASE(json_obj, 'NAME')` |
-| [JSON_EACH](json/json-each) | Expands JSON object into key-value pairs | `JSON_EACH(PARSE_JSON('{"a":1,"b":2}'))` |
-| [JSON_ARRAY_ELEMENTS](json/json-array-elements) | Expands JSON array into individual elements | `JSON_ARRAY_ELEMENTS(PARSE_JSON('[1,2,3]'))` |
+| [JSON_EXTRACT_PATH_TEXT](json/json-extract-path-text) | Extracts text value from JSON using path | `JSON_EXTRACT_PATH_TEXT(json_obj, 'name')` |
+
+### Transformation & Output
+| Function | Description | Example |
+|----------|-------------|--------|
+| [JSON_TO_STRING](json/json-to-string) | Converts a JSON value to a string | `JSON_TO_STRING(PARSE_JSON('{"a":1}'))` |
 | [JSON_PRETTY](json/json-pretty) | Formats JSON with proper indentation | `JSON_PRETTY(PARSE_JSON('{"a":1}'))` |
 | [STRIP_NULL_VALUE](json/strip-null-value) | Removes null values from JSON | `STRIP_NULL_VALUE(PARSE_JSON('{"a":1,"b":null}'))` |
 
+### Array/Object Expansion
+| Function | Description | Example |
+|----------|-------------|--------|
+| [JSON_EACH](json/json-each) | Expands JSON object into key-value pairs | `JSON_EACH(PARSE_JSON('{"a":1,"b":2}'))` |
+| [JSON_ARRAY_ELEMENTS](json/json-array-elements) | Expands JSON array into individual elements | `JSON_ARRAY_ELEMENTS(PARSE_JSON('[1,2,3]'))` |
+
 ## Array Functions
 
 | Function | Description | Example |