presto-geospatial/src/main/java/io/prestosql/plugin/geospatial/GeoFunctions.java/GeoFunctions/stUnion
class GeoFunctions:    @Description("Returns a geometry that represents the point set union of the input geometries.")
    @ScalarFunction("ST_Union")
    @SqlType(GEOMETRY_TYPE_NAME)
    public static Slice stUnion(@SqlType(GEOMETRY_TYPE_NAME) Slice left, @SqlType(GEOMETRY_TYPE_NAME) Slice right)
    {
        return stUnion(ImmutableList.of(left, right));
    }