Turns a single geometry into a multi geometry.
If the geometry is already a multi geometry, it is returned as is.
Provided by
The spatial extension (LOAD spatial;).
SQL examples
SELECT ST_Multi(ST_GeomFromText('POINT(1 2)'));
-- MULTIPOINT (1 2)
--
-- SELECT ST_Multi(ST_GeomFromText('LINESTRING(1 1, 2 2)'));
-- MULTILINESTRING ((1 1, 2 2))
--
-- SELECT ST_Multi(ST_GeomFromText('POLYGON((0 0, 0 1, 1 1, 1 0, 0 0))'));
-- MULTIPOLYGON (((0 0, 0 1, 1 1, 1 0, 0 0)))