public static MethodInfo Sum_Int32_TSource_2(Type TSource) =>
(s_Sum_Int32_TSource_2 ??
(s_Sum_Int32_TSource_2 = new Func<IQueryable<object>, Expression<Func<object, int>>, int>(Queryable.Sum).GetMethodInfo().GetGenericMethodDefinition()))
.MakeGenericMethod(TSource);