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 ](https://aws.amazon.com/blogs/big-data/amazon-redshift-python-user-defined-functions-will-reach-end-of-support-after-june-30-2026/). 

# IS\$1BOOLEAN function
<a name="r_is_boolean"></a>

Checks whether a value is a `BOOLEAN`. The IS\$1BOOLEAN function returns `true` for constant JSON Booleans. The function returns `false` for any other values, including null.

## Syntax
<a name="r_is_boolean-synopsis"></a>

```
IS_BOOLEAN(super_expression)
```

## Arguments
<a name="r_is_boolean-arguments"></a>

*super\$1expression*  
A `SUPER` expression or column.

## Return type
<a name="r_is_boolean-returns"></a>

`BOOLEAN`

## Examples
<a name="r_is_boolean_example"></a>

To check if `TRUE` is a `BOOLEAN` using the IS\$1BOOLEAN function, use the following example.

```
CREATE TABLE t(s SUPER);

INSERT INTO t VALUES (TRUE);

SELECT s, IS_BOOLEAN(s) FROM t;

+------+------------+
|  s   | is_boolean |
+------+------------+
| true | true       |
+------+------------+
```