Extensions
Scalar Functions
```sql
SELECT st_points('LINESTRING(1 1, 2 2)'::GEOMETRY);
----
MULTIPOINT (1 1, 2 2)

SELECT st_points('MULTIPOLYGON Z EMPTY'::GEOMETRY);
----
MULTIPOINT Z EMPTY
```  
----  
#### ST_QuadKey {#docs:extensions:spatial:functions::st_quadkey}