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|
# Fibonacci, for recursion test. (Yet Another Numerical series :)
# Split from main.sp due to problems reported in Bug#15866
--disable_warnings
drop table if exists t3;
--enable_warnings
create table t3 ( f bigint unsigned not null );
# We deliberately do it the awkward way, fetching the last two
# values from the table, in order to exercise various statements
# and table accesses at each turn.
--disable_warnings
drop procedure if exists fib;
--enable_warnings
# Now for multiple statements...
delimiter |;
create procedure fib(n int unsigned)
begin
if n > 1 then
begin
declare x, y bigint unsigned;
declare c cursor for select f from t3 order by f desc limit 2;
open c;
fetch c into y;
fetch c into x;
insert into t3 values (x+y);
call fib(n-1);
## Close the cursor AFTER the recursion to ensure that the stack
## frame is somewhat intact.
close c;
end;
end if;
end|
# Enable recursion
set @@max_sp_recursion_depth= 20|
insert into t3 values (0), (1)|
# The small number of recursion levels is intentional.
# We need to avoid
# Bug#15866 main.sp fails (thread stack limit
# insufficient for recursive call "fib(20)")
# which affects some platforms.
call fib(4)|
select * from t3 order by f asc|
drop table t3|
drop procedure fib|
set @@max_sp_recursion_depth= 0|
|
