code: def evaluate(self, data, env):
          
          bool_idx = self.predicate_expr.evaluate(data, env)
          true_value = self.true_value_expr.evaluate(data, env)
          false_value = self.false_value_expr.evaluate(data, env)
          true_idx = np.where(bool_idx)[0]
          false_idx = np.where(~bool_idx)[0]
          result = np.repeat(None, len(data))
          result[true_idx] = self.nice_value(true_value, true_idx)
          result[false_idx] = self.nice_value(false_value, false_idx)
          return np.array(list(result))
docs: Evaluate the predicates and values