Amazon Redshift will no longer support the use of Python UDFs after June 30, 2026. We will start enforcing it in phases. For more information on the details of Python end of life and migration options, see the blog post that was published on June 30, 2025.

IS_CHAR function

Checks whether a value is a CHAR. The IS_CHAR function returns true for strings that have only ASCII characters, because the CHAR type can store only characters that are in the ASCII format. The function returns false for any other values.

Syntax

IS_CHAR(super_expression)

Arguments

Return type

BOOLEAN

Examples

To check if t is a CHAR using the IS_CHAR function, use the following example.

CREATE TABLE t(s SUPER);

INSERT INTO t VALUES ('t');

SELECT s, IS_CHAR(s) FROM t;

+-----+---------+
|  s  | is_char |
+-----+---------+
| "t" | true    |
+-----+---------+