AS_STRING

Strict casting VARIANT values to VARCHAR data type. If the input data type is not VARIANT, the output is NULL. If the type of value in the VARIANT does not match the output value, the output is NULL.

Syntax

AS_STRING( <variant> )

Arguments

Arguments	Description
<variant>	The VARIANT value

Return Type

VARCHAR

Examples

SELECT as_string(parse_json('"abc"'));
+--------------------------------+
| as_string(parse_json('"abc"')) |
+--------------------------------+
| abc                            |
+--------------------------------+

SELECT as_string(parse_json('"hello world"'));
+----------------------------------------+
| as_string(parse_json('"hello world"')) |
+----------------------------------------+
| hello world                            |
+----------------------------------------+

-- Returns NULL for non-string values
SELECT as_string(parse_json('123'));
+------------------------------+
| as_string(parse_json('123')) |
+------------------------------+
| NULL                         |
+------------------------------+