They shouldn't be smaller in containers unless the soil volume you have or fertilization has something to do with it.
My Rosa Bianca and Ping Tung are in containers. My Rosa Bianca get about 6" and Ping Tung between 8-12" long. I have 3 containers for eggplant, I not exactly sure how many gallons but one has to be at least 16 gallons and the others about 12 gallons. I have 2 plants in each container except the largest one where I tried 2 Rosa Bianca and 1 Ping Tung.
I took this picture last week, time to harvest these now.
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