@Override
    public final <R,C> R accept(Visitor<R,C> v, C context) {
        return v.visit(opMixin, context);
    }
{@code PolygonOperation} extends {@link PolygonExpression} to implement the
{@link Operation} interface

@author tiwe

@param <T>
querydsl-spatial/src/main/java/com/querydsl/spatial/PolygonOperation.java