What is the variety of solanum that is trained to be a standard? It has bluish purple or white flowers with orangy yellow stamen. The leaf is lancet and dark green while the ripened fruit turns a light orange. Sorry about the lack of pictures.
The most likely candidate for the plant you are describing is the Paraguay Nightshade or Solanum rantonnetii (aka Lycianthes rantonnetii).
It is an evergreen shrub in warmer climates, but here it must be treated as an annual or brought indoors to be overwintered as a tender woody plant.