Přepište a otestujte, který z nich funguje rychleji:
SELECT *, storedfunc(param, table.column) AS f
FROM table
WHERE storedfunc(param, table.column) < value
ORDER BY f ;
SELECT *
FROM
( SELECT *, storedfunc(param, table.column) AS f
FROM table
) AS tmp
WHERE f < value
ORDER BY f ;
V MySQL můžete dokonce psát takto (varování:ne standardní SQL syntaxe):
SELECT *, storedfunc(param, table.column) AS f
FROM table
HAVING f < value
ORDER BY f ;