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