presto-geospatial/src/main/java/io/prestosql/plugin/geospatial/GeoFunctions.java/GeoFunctions/geometryUnion
class GeoFunctions:    @Description("Returns a geometry that represents the point set union of the input geometries.")
    @ScalarFunction("geometry_union")
    @SqlType(GEOMETRY_TYPE_NAME)
    public static Slice geometryUnion(@SqlType("array(" + GEOMETRY_TYPE_NAME + ")") Block input)
    {
        return stUnion(getGeometrySlicesFromBlock(input));
    }