fixed optimized SOME subquery

mysql-test/r/subselect.result:
  correct results of SOME subquery
sql/item_cmpfunc.cc:
  some comments added
  fixed optimized SOME subquery

mysql-test/r/subselect.result

@@ -1490,9 +1490,6 @@ Warnings:
 Note	1003	select test.t3.a AS `a` from test.t3 where <not>((test.t3.a < (select max(test.t2.b) from test.t2)))
 select * from t3 where a >= some (select b from t2);
 a
-6
-7
-3
 explain extended select * from t3 where a >= some (select b from t2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t3	ALL	NULL	NULL	NULL	NULL	3	Using where
@@ -1512,9 +1509,6 @@ Warnings:
 Note	1003	select test.t3.a AS `a` from test.t3 where <not>((test.t3.a < <max>(select test.t2.b AS `b` from test.t2 group by test.t2.b)))
 select * from t3 where a >= some (select b from t2 group by 1);
 a
-6
-7
-3
 explain extended select * from t3 where a >= some (select b from t2 group by 1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t3	ALL	NULL	NULL	NULL	NULL	3	Using where

sql/item_cmpfunc.cc

@@ -120,7 +120,7 @@ longlong Item_func_not_all::val_int()
 
   /*
     return TRUE if there was records in underlaying select in max/min
-    optimisation
+    optimisation (ALL subquery)
   */
   if (empty_underlying_subquery())
     return 1;
@@ -157,11 +157,11 @@ longlong Item_func_nop_all::val_int()
   double value= args[0]->val();
 
   /*
-    return TRUE if there was records in underlaying select in max/min
-    optimisation
+    return FALSE if there was records in underlaying select in max/min
+    optimisation (SAME/ANY subquery)
   */
   if (empty_underlying_subquery())
-    return 1;
+    return 0;
 
   null_value= args[0]->null_value;
   return (null_value || value == 0) ? 0 : 1;