Southwestern Pasta Salad

Name: Southwestern Pasta Salad
Cook time: 35 min
Total time: 35 min
Cuisine: American, Southern
Ingredients: 8 ounces campanelle or other short pasta; 1 teaspoon kosher salt, divided, plus more for pasta water; 0.75 cup olive oil; 0.5 cup loosely packed fresh cilantro leaves and tender stems; 0.25 cup fresh lime juice (from about 2 limes); 1 ripe avocado, halved, divided; 0.5 teaspoon black pepper, divided; 1 15.5-oz. can black beans, rinsed and drained; 1 pint cherry tomatoes, halved; 1 cup fresh corn kernels (from about 3 ears) or 1 frozen corn, thawed; 5 scallions, thinly sliced