create table parallel_nested_loop_test_a (id int); create table parallel_nested_loop_test_b (id int); insert into parallel_nested_loop_test_a select n from generate_series(1,2) n; insert into parallel_nested_loop_test_b select n from generate_series(1,5) n; explain (costs off) select * from parallel_nested_loop_test_a left outer join parallel_nested_loop_test_b on parallel_nested_loop_test_a.id = 1; select * from parallel_nested_loop_test_a left outer join parallel_nested_loop_test_b on parallel_nested_loop_test_a.id = 1; set parallel_setup_cost = 0; set min_parallel_table_scan_size=0; set force_parallel_mode=on; explain (costs off) select * from parallel_nested_loop_test_a left outer join parallel_nested_loop_test_b on parallel_nested_loop_test_a.id = 1; select * from parallel_nested_loop_test_a left outer join parallel_nested_loop_test_b on parallel_nested_loop_test_a.id = 1; drop table parallel_nested_loop_test_a; drop table parallel_nested_loop_test_b; reset parallel_setup_cost; reset min_parallel_table_scan_size; reset force_parallel_mode;