Syntax
------

GeometryCollection(g1,g2,...)

Description
-----------

Constructs a WKB GeometryCollection. If any argument is not a well-formed WKB
representation of a geometry, the return value is NULL.

Examples
--------

CREATE TABLE gis_geometrycollection  (g GEOMETRYCOLLECTION);
SHOW FIELDS FROM gis_geometrycollection;
INSERT INTO gis_geometrycollection VALUES
  (GeomCollFromText('GEOMETRYCOLLECTION(POINT(0 0), LINESTRING(0 0,10
10))')),
  (GeometryFromWKB(AsWKB(GeometryCollection(Point(44, 6),
LineString(Point(3, 6), Point(7, 9)))))),
  (GeomFromText('GeometryCollection()')),
  (GeomFromText('GeometryCollection EMPTY'));

URL: https://mariadb.com/kb/en/geometrycollection/