public static MethodInfo Sum_Decimal_TSource_2(Type TSource) =>
(s_Sum_Decimal_TSource_2 ??
(s_Sum_Decimal_TSource_2 = new Func<IQueryable<object>, Expression<Func<object, decimal>>, decimal>(Queryable.Sum).GetMethodInfo().GetGenericMethodDefinition()))
.MakeGenericMethod(TSource);