Amazon Redshift will no longer support the creation of new Python UDFs starting Patch 198. Existing Python UDFs will continue to function until June 30, 2026. For more information, see the blog post .

IS_VARCHAR function

Checks whether a variable is a VARCHAR. The IS_VARCHAR function returns true for all strings. The function returns false for any other values.

The IS_VARCHAR function is a superset of the IS_CHAR function.

Syntax

IS_VARCHAR(super_expression)

Arguments

Return type

BOOLEAN

Examples

To check if abc is a VARCHAR using the IS_VARCHAR function, use the following example.

CREATE TABLE t(s SUPER);

INSERT INTO t VALUES ('abc');

SELECT s, IS_VARCHAR(s) FROM t;

+-------+------------+
|   s   | is_varchar |
+-------+------------+
| "abc" | true       |
+-------+------------+