ST_GeomCollFromWKB(wkb [, srid]), ST_GeometryCollectionFromWKB(wkb [,
srid])

Constructs a GeometryCollection value using its WKB representation and
SRID.

The result is NULL if the WKB or SRID argument is NULL.

URL: https://dev.mysql.com/doc/refman/5.7/en/gis-wkb-functions.html

