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/). 

# ST\$1IsCollection
<a name="ST_IsCollection-function"></a>

ST\$1IsCollection returns true if the input geometry is one of the following subtypes: `GEOMETRYCOLLECTION`, `MULTIPOINT`, `MULTILINESTRING`, or `MULTIPOLYGON`. 

## Syntax
<a name="ST_IsCollection-function-syntax"></a>

```
ST_IsCollection(geom)
```

## Arguments
<a name="ST_IsCollection-function-arguments"></a>

 *geom*   
A value of data type `GEOMETRY` or an expression that evaluates to a `GEOMETRY` type. 

## Return type
<a name="ST_IsCollection-function-return"></a>

`BOOLEAN`

If *geom* is null, then null is returned. 

## Examples
<a name="ST_IsCollection-function-examples"></a>

The following SQL checks if the polygon is a collection. 

```
SELECT ST_IsCollection(ST_GeomFromText('POLYGON((0 2,1 1,0 -1,0 2))'));
```

```
st_iscollection
-----------
 false
```