MySQL stored procedure OUT param returned as null (NO LOCAL VARIABLE DECLARED) -

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i trying debug problem. i've gone great extremes , trying figure out why mysql return null when return var explicitly set value.

delimiter $$  create definer=`root`@`localhost` procedure `foo`(     out numberexpectedtofill int(11))     deterministic begin      set numberexpectedtofill := 23;     commit;  end

so, scripted little script call it, , return value null. why?

prepare s 'call `test_schema`.`foo`(@output)'; execute s; select @output

this unexpected ... works in sqlfiddle both , without using prepared statement: http://sqlfiddle.com/#!2/d4ddf/1, http://sqlfiddle.com/#!2/d4ddf/2

maybe there problem permissions (would signal error, thought) ?!?

edit: still guessing -- sure call foo right schema? o_o


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