Create 'main' test directory and move 't' and 'r' there

mysql-test/main/sp-fib.test

@@ -0,0 +1,54 @@
+# 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|
+