AS_OBJECT

将 VARIANT 值严格转换为 OBJECT 数据类型。如果输入数据类型不是 VARIANT，则输出为 NULL。如果 VARIANT 中的值类型与输出值不匹配，则输出为 NULL。

语法

AS_OBJECT( <variant> )

参数

返回类型

Variant 包含 Object

示例

SELECT as_object(parse_json('{"k":"v","a":"b"}'));
+--------------------------------------------+
| as_object(parse_json('{"k":"v","a":"b"}')) |
+--------------------------------------------+
| {"k":"v","a":"b"}                          |
+--------------------------------------------+

SELECT as_object(parse_json('{"name":"John","age":30}'));
+-----------------------------------------------+
| as_object(parse_json('{"name":"John","age":30}')) |
+-----------------------------------------------+
| {"name":"John","age":30}                      |
+-----------------------------------------------+

-- Returns NULL for non-object values
SELECT as_object(parse_json('[1,2,3]'));
+----------------------------------+
| as_object(parse_json('[1,2,3]')) |
+----------------------------------+
| NULL                             |
+----------------------------------+