ST_RemoveRepeatedPoints — Returns a version of the given geometry with duplicated points removed.
geometry ST_RemoveRepeatedPoints(geometry geom);
Returns a version of the given geometry with duplicated points removed. Will actually do something only with (multi)lines, (multi)polygons and multipoints but you can safely call it with any kind of geometry. Since simplification occurs on a object-by-object basis you can also feed a GeometryCollection to this function.
Availability: 2.0.0