b45f501e51
Support aggregate functions in select without from clause, here are some examples as following: SELECT 1, 'a', COUNT(), SUM(1) + 1, AVG(2) / COUNT(), MAX(3), MIN(4), RANK() OVER() AS w_rank, DENSE_RANK() OVER() AS w_dense_rank, ROW_NUMBER() OVER() AS w_row_number, SUM(5) OVER() AS w_sum, AVG(6) OVER() AS w_avg, COUNT() OVER() AS w_count, MAX(7) OVER() AS w_max, MIN(8) OVER() AS w_min;