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\$1Multi
<a name="ST_Multi-function"></a>

ST\$1Multi converts a geometry to the corresponding multitype. If the input geometry is already a multitype or a geometry collection, a copy of it is returned. If the input geometry is a point, linestring, or polygon, then a multipoint, multilinestring, or multipolygon, respectively, that contains the input geometry is returned. 

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

```
ST_Multi(geom)
```

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

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

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

`GEOMETRY` with subtype `MULTIPOINT`, `MULTILINESTRING`, `MULTIPOLYGON`, or `GEOMETRYCOLLECTION`. 

The spatial reference system identifier (SRID) of the returned geometry is the same as that of the input geometry. 

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

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

The following SQL returns a multipoint from an input multipoint. 

```
SELECT ST_AsEWKT(ST_Multi(ST_GeomFromText('MULTIPOINT((1 2),(3 4))', 4326)));
```

```
    st_asewkt
------------------------------------
  SRID=4326;MULTIPOINT((1 2),(3 4))
```

The following SQL returns a multipoint from an input point. 

```
SELECT ST_AsEWKT(ST_Multi(ST_GeomFromText('POINT(1 2)', 4326)));
```

```
    st_asewkt
------------------------------------
  SRID=4326;MULTIPOINT((1 2))
```

The following SQL returns a geometry collection from an input geometry collection. 

```
SELECT ST_AsEWKT(ST_Multi(ST_GeomFromText('GEOMETRYCOLLECTION(POINT(1 2),MULTIPOINT((1 2),(3 4)))', 4326)));
```

```
    st_asewkt
------------------------------------
  SRID=4326;GEOMETRYCOLLECTION(POINT(1 2),MULTIPOINT((1 2),(3 4)))
```