Bring the brown rice, water, olive oil, and 1//2 teaspoon salt to a boil in a saucepan. Reduce heat to medium-low, cover, and simmer until the rice is tender and the liquid has been absorbed, 45 to 50 minutes. Scrape into a mixing bowl, fluff with a fork, and refrigerate to room temperature.
Stir the collard greens, black beans, green peas, corn, green chiles, olives, and tomatoes into the cooled rice until evenly mixed. Season to taste with salt and pepper before serving.
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