==2761== Thread 10:
==2761== Conditional jump or move depends on uninitialised value(s)
==2761==    at 0x81913BB: find_best(JOIN*, unsigned long long, unsigned, double, double) (sql_select.cc:2689)
==2761==    by 0x8191030: find_best_combination(JOIN*, unsigned long long) (sql_select.cc:2599)