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# Checking stack usage # # basic tests # select variable_value > 0 from information_schema.session_status where variable_name="stack_usage"; variable_value > 0 1 # # Ensure stack usage is same for each iteration when using WITH recursive # create table t1 WITH recursive Fibonacci(PrevN, N, Stack) AS ( SELECT 0, 1, 0 UNION ALL SELECT N, PrevN + N, (select variable_value from information_schema.session_status where variable_name="stack_usage") FROM Fibonacci WHERE N < 100000 ) SELECT PrevN as N, Stack FROM Fibonacci; select (select stack from t1 where n=2) = (select stack from t1 where N=75025) as c; c 1 DROP table t1; # # Check stack with recursion # set @@max_sp_recursion_depth=20; create or replace procedure recursion(x int, max int, OUT res int) begin select variable_value into res from information_schema.session_status where variable_name="stack_usage"; if (x < max) then call recursion(x+1, max, res); end if; end; $$ call recursion(0,2,@s1); call recursion(0,3,@s2); call recursion(0,4,@s3); $$ select @s1 > 0 && @s2 > 0 && @s3 > 0; @s1 > 0 && @s2 > 0 && @s3 > 0 1 drop procedure recursion; # # End of 10.5 tests #