docs: new json functions & operators

docs/doc/14-sql-commands/10-dml/dml-delete-from.md

@@ -55,7 +55,7 @@ SELECT * FROM bookstore;
 
 ### Example 2: Subquery-Based Deletions
 
-When using a subquery to identify the rows to be deleted, [Subquery Operators](../30-query-operators/subquery.md) and [Comparison Operators](../30-query-operators/comparisons/index.md) can be utilized to achieve the desired deletion.
+When using a subquery to identify the rows to be deleted, [Subquery Operators](../30-query-operators/subquery.md) and [Comparison Operators](../30-query-operators/comparison.md) can be utilized to achieve the desired deletion.
 
 The examples in this section are based on the following two tables:
 

docs/doc/14-sql-commands/30-query-operators/comparison.md

@@ -0,0 +1,15 @@
+---
+title: Comparison Operators
+---
+
+| Operator | Description | Example | Result |
+|----------------------------|---------------------------------------------|----------------------------|--------|
+| **=** | a is equal to b | **2 = 2** | TRUE |
+| **!=** | a is not equal to b | **2 != 3** | TRUE |
+| **<\>** | a is not equal to b | **2 <\> 2** | FALSE |
+| **>** | a is greater than b | **2 > 3** | FALSE |
+| **>=** | a is greater than or equal to b | **4 >= NULL** | NULL |
+| **<** | a is less than b | **2 < 3** | TRUE |
+| **<=** | a is less than or equal to b | **2 <= 3** | TRUE |
+| **IS NULL** | TRUE if expression is NULL, FALSE otherwise | **(4 >= NULL) IS NULL** | TRUE |
+| **IS NOT NULL** | FALSE if expression is NULL, TRUE otherwise | **(4 >= NULL) IS NOT NULL**| FALSE |

docs/doc/14-sql-commands/30-query-operators/json/index.md → docs/doc/14-sql-commands/30-query-operators/json.md

@@ -1,16 +1,18 @@
 ---
-title: 'JSON Operators'
+title: JSON Operators
 ---
 import FunctionDescription from '@site/src/components/FunctionDescription';
 
-<FunctionDescription description="Introduced or updated: v1.2.190"/>
+<FunctionDescription description="Introduced or updated: v1.2.209"/>
 
 | Operator | Description | Example | Result |
 |----------|-------------|---------|--------|
 | -> | Retrieves a JSON array or object using an index or key, returning a JSON object. | - **Using a key**:<br/>`PARSE_JSON('{"Databend": "Cloud Native Warehouse"}')->'Databend'`<br/>- **Using an index**:<br/>`PARSE_JSON('["Databend", "Cloud Native Warehouse"]')->1` | Cloud Native Warehouse |
 | ->> | Retrieves a JSON array or object using an index or key, returning a string. | - **Using a key**:<br/>`PARSE_JSON('{"Databend": "Cloud Native Warehouse"}')->>'Databend'`<br/>- **Using an index**:<br/>`PARSE_JSON('["Databend", "Cloud Native Warehouse"]')->>1` | Cloud Native Warehouse |
 | #> | Retrieves a JSON array or object by specifying a key path, returning a JSON object. | `PARSE_JSON('{"example": {"Databend": "Cloud Native Warehouse"}}')#>'{example, Databend}'` | Cloud Native Warehouse |
 | #>> | Retrieves a JSON array or object by specifying a key path, returning a string. | `PARSE_JSON('{"example": {"Databend": "Cloud Native Warehouse"}}')#>>'{example, Databend}'` | Cloud Native Warehouse |
-| ? | Checks if the given string exists in a JSON object as a key or array and returns a boolean result (1 for true, 0 for false). | `PARSE_JSON('{"a":1,"b":2,"c":3}') ? 'b'`| 1 |
-| ?\| | Checks if any string in the given array exists as a key or array element and returns a boolean result (1 for true, 0 for false). | PARSE_JSON('{"a":1,"b":2,"c":3}') ?\| ['b','e'] | 1 |
-| ?& | Checks if each string in the given array exists as a key or array element and returns a boolean result (1 for true, 0 for false). | `PARSE_JSON('{"a":1,"b":2,"c":3}') ?& ['b','e']` | 0 |
+| ? | Checks if the given string exists in a JSON object as a key or array, returning 1 for true and 0 for false. | `PARSE_JSON('{"a":1,"b":2,"c":3}') ? 'b'`| 1 |
+| ?\| | Checks if any string in the given array exists as a key or array element, returning 1 for true and 0 for false. | PARSE_JSON('{"a":1,"b":2,"c":3}') ?\| ['b','e'] | 1 |
+| ?& | Checks if each string in the given array exists as a key or array element, returning 1 for true and 0 for false. | `PARSE_JSON('{"a":1,"b":2,"c":3}') ?& ['b','e']` | 0 |
+| @> | Checks if the left JSON expression contains all key-value pairs of the right JSON expression, returning 1 for true and 0 for false. | `PARSE_JSON('{"name":"Alice","age":30}') @> PARSE_JSON('{"name":"Alice"}')` | 1 |
+| <@ | Checks if the left JSON expression is a subset of the right JSON expression, returning 1 for true and 0 for false. | `PARSE_JSON('{"name":"Alice"}') <@ PARSE_JSON('{"name":"Bob"}')` | 0 |

docs/doc/14-sql-commands/30-query-operators/logic/index.md → docs/doc/14-sql-commands/30-query-operators/logical.md

@@ -1,8 +1,7 @@
 ---
-title: 'Logical/Boolean Operators'
+title: Logical Operators
 ---
 
-
 | Operator | Description | Example | Result |
 |----------|----------------------------------------|---------------|--------|
 | **AND** | Matches both expressions (`a` and `b`) | **1 AND 1** | TRUE |

docs/doc/14-sql-commands/30-query-operators/subquery.md

@@ -1,7 +1,5 @@
 ---
 title: Subquery Operators
-description:
- A subquery is a query nested within another query.
 ---
 
 A subquery is a query nested within another one. Databend supports the following subquery types:
@@ -156,7 +154,7 @@ WHERE t1.a NOT IN (SELECT *
 
 You can use ANY (or SOME) to check whether a comparison is true for any of the values returned by a subquery.
 
-- The keyword ANY (or SOME) must follow one of the [Comparison Operators](comparisons/index.md).
+- The keyword ANY (or SOME) must follow one of the [Comparison Operators](comparison.md).
 - If the subquery doesn't return any values, the comparison evaluates to false.
 - SOME work the same way as ANY.
 
@@ -203,7 +201,7 @@ WHERE t1.a < ANY (SELECT *
 
 You can use ALL to check whether a comparison is true for all of the values returned by a subquery.
 
-- The keyword ALL must follow one of the [Comparison Operators](comparisons/index.md).
+- The keyword ALL must follow one of the [Comparison Operators](comparison.md).
 - If the subquery doesn't return any values, the comparison evaluates to true.
 
 ### Syntax

docs/doc/15-sql-functions/110-semi-structured-functions/index.md

@@ -12,6 +12,8 @@ This section provides reference information for the semi-structured data functio
 - [FLATTEN](flatten.md)
 
 ## JSON Query and Extraction:
+- [JSON_ARRAY_ELEMENTS](json-array-elements.md)
+- [JSON_EACH](json-array.md)
 - [JSON_EXTRACT_PATH_TEXT](json-extract-path-text.md)
 - [JSON_PATH_EXISTS](json-path-exists.md)
 - [JSON_PATH_QUERY](json-path-query.md)

docs/doc/15-sql-functions/110-semi-structured-functions/json-array-elements.md

@@ -0,0 +1,66 @@
+---
+title: JSON_ARRAY_ELEMENTS
+---
+import FunctionDescription from '@site/src/components/FunctionDescription';
+
+<FunctionDescription description="Introduced or updated: v1.2.152"/>
+
+Extracts the elements from a JSON array, returning them as individual rows in the result set. JSON_ARRAY_ELEMENTS does not recursively expand nested arrays; it treats them as single elements.
+
+
+
+## Syntax
+
+```sql
+JSON_ARRAY_ELEMENTS(<json_string>)
+```
+
+## Return Type
+
+JSON_ARRAY_ELEMENTS returns a set of VARIANT values, each representing an element extracted from the input JSON array.
+
+## Examples
+
+```sql
+-- Extract individual elements from a JSON array containing product information
+SELECT
+ JSON_ARRAY_ELEMENTS(
+ PARSE_JSON (
+ '[ 
+ {"product": "Laptop", "brand": "Apple", "price": 1500},
+ {"product": "Smartphone", "brand": "Samsung", "price": 800},
+ {"product": "Headphones", "brand": "Sony", "price": 150}
+]'
+ )
+ );
+
+┌─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
+│ json_array_elements(parse_json('[ \n {"product": "laptop", "brand": "apple", "price": 1500},\n {"product": "smartphone", "brand": "samsung", "price": 800},\n {"product": "headphones", "brand": "sony", "price": 150}\n]')) │
+├─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
+│ {"brand":"Apple","price":1500,"product":"Laptop"} │
+│ {"brand":"Samsung","price":800,"product":"Smartphone"} │
+│ {"brand":"Sony","price":150,"product":"Headphones"} │
+└─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
+
+-- Display data types of the extracted elements
+SELECT
+ TYPEOF (
+ JSON_ARRAY_ELEMENTS(
+ PARSE_JSON (
+ '[ 
+ {"product": "Laptop", "brand": "Apple", "price": 1500},
+ {"product": "Smartphone", "brand": "Samsung", "price": 800},
+ {"product": "Headphones", "brand": "Sony", "price": 150}
+]'
+ )
+ )
+ );
+
+┌─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
+│ typeof(json_array_elements(parse_json('[ \n {"product": "laptop", "brand": "apple", "price": 1500},\n {"product": "smartphone", "brand": "samsung", "price": 800},\n {"product": "headphones", "brand": "sony", "price": 150}\n]'))) │
+├─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
+│ VARIANT NULL │
+│ VARIANT NULL │
+│ VARIANT NULL │
+└─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
+```

docs/doc/15-sql-functions/110-semi-structured-functions/json-each.md

@@ -0,0 +1,59 @@
+---
+title: JSON_EACH
+---
+import FunctionDescription from '@site/src/components/FunctionDescription';
+
+<FunctionDescription description="Introduced or updated: v1.2.152"/>
+
+Extracts key-value pairs from a JSON object, breaking down the structure into individual rows in the result set. Each row represents a distinct key-value pair derived from the input JSON expression.
+
+## Syntax
+
+```sql
+JSON_EACH(<json_string>)
+```
+
+## Return Type
+
+JSON_EACH returns a set of tuples, each consisting of a STRING key and a corresponding VARIANT value.
+
+## Examples
+
+```sql
+-- Extract key-value pairs from a JSON object representing information about a person
+SELECT
+ JSON_EACH(
+ PARSE_JSON (
+ '{"name": "John", "age": 25, "isStudent": false, "grades": [90, 85, 92]}'
+ )
+ );
+
+
+┌──────────────────────────────────────────────────────────────────────────────────────────────────┐
+│ json_each(parse_json('{"name": "john", "age": 25, "isstudent": false, "grades": [90, 85, 92]}')) │
+├──────────────────────────────────────────────────────────────────────────────────────────────────┤
+│ ('age','25') │
+│ ('grades','[90,85,92]') │
+│ ('isStudent','false') │
+│ ('name','"John"') │
+└──────────────────────────────────────────────────────────────────────────────────────────────────┘
+
+-- Display data types of the extracted values
+SELECT
+ TYPEOF (
+ JSON_EACH(
+ PARSE_JSON (
+ '{"name": "John", "age": 25, "isStudent": false, "grades": [90, 85, 92]}'
+ )
+ )
+ );
+
+┌──────────────────────────────────────────────────────────────────────────────────────────────────────────┐
+│ typeof(json_each(parse_json('{"name": "john", "age": 25, "isstudent": false, "grades": [90, 85, 92]}'))) │
+├──────────────────────────────────────────────────────────────────────────────────────────────────────────┤
+│ TUPLE(STRING, VARIANT) NULL │
+│ TUPLE(STRING, VARIANT) NULL │
+│ TUPLE(STRING, VARIANT) NULL │
+│ TUPLE(STRING, VARIANT) NULL │
+└──────────────────────────────────────────────────────────────────────────────────────────────────────────┘
+```