Post-review fixes for bug #20924

mysql-test/r/case.result:
  Post-review fix for bug #20924
mysql-test/r/func_if.result:
  Post-review fix for bug #20924
mysql-test/r/func_test.result:
  Post-review fix for bug #20924
mysql-test/r/user_var.result:
  Post-review fix for bug #20924
mysql-test/t/case.test:
  Post-review fix for bug #20924
mysql-test/t/func_if.test:
  Post-review fix for bug #20924
mysql-test/t/func_test.test:
  Post-review fix for bug #20924
mysql-test/t/user_var.test:
  Post-review fix for bug #20924
sql/item_func.cc:
  Post-review fix for bug #20924
sql/item_func.h:
  Post-review fix for bug #20924
sql/log_event.cc:
  Post-review fix for bug #20924

mysql-test/r/case.result

@@ -183,3 +183,4 @@ CASE 1 WHEN 1 THEN 18446744073709551615 ELSE 1 END
 SELECT COALESCE(18446744073709551615);
 COALESCE(18446744073709551615)
 18446744073709551615
+End of 4.1 tests

mysql-test/r/func_if.result

@@ -105,3 +105,4 @@ IF(1 != 0, 18446744073709551615, 1)
 SELECT IFNULL(NULL, 18446744073709551615);
 IFNULL(NULL, 18446744073709551615)
 18446744073709551615
+End of 4.1 tests

mysql-test/r/func_test.result

@@ -189,3 +189,4 @@ GREATEST(1, 18446744073709551615)
 SELECT LEAST(1, 18446744073709551615);
 LEAST(1, 18446744073709551615)
 1
+End of 4.1 tests

mysql-test/r/user_var.result

@@ -207,3 +207,4 @@ set @a=18446744073709551615;
 select @a;
 @a
 18446744073709551615
+End of 4.1 tests

mysql-test/t/case.test

@@ -131,9 +131,11 @@ from t1 where b=3 group by b;
 drop table t1;
 
 #
-# Bug #20924: UNSIGNED values in CASE and COALESCE are treated as SIGNED
+# Bug #20924: CAST(expr as UNSIGNED) returns SIGNED value when used in various
+# functions
+# - UNSIGNED values in CASE and COALESCE are treated as SIGNED
 #
 SELECT CASE 1 WHEN 1 THEN 18446744073709551615 ELSE 1 END;
 SELECT COALESCE(18446744073709551615);
 
-# End of 4.1 tests
+--echo End of 4.1 tests

mysql-test/t/func_if.test

@@ -74,13 +74,17 @@ SELECT a, NULLIF(a,'') FROM t1 WHERE NULLIF(a,'') IS NULL;
 DROP TABLE t1;
 
 #
-# Bug #20924: UNSIGNED values in IF() are treated as SIGNED
+# Bug #20924: CAST(expr as UNSIGNED) returns SIGNED value when used in various
+# functions
+# - UNSIGNED values in IF() are treated as SIGNED
 #
 SELECT IF(1 != 0, 18446744073709551615, 1);
 
 #
-# Bug #20924: UNSIGNED values in IFNULL() are treated as SIGNED
+# Bug #20924: CAST(expr as UNSIGNED) returns SIGNED value when used in various
+# functions
+# - UNSIGNED values in IFNULL() are treated as SIGNED
 #
 SELECT IFNULL(NULL, 18446744073709551615);
 
-# End of 4.1 tests
+--echo End of 4.1 tests

mysql-test/t/func_test.test

@@ -109,9 +109,11 @@ select 5.1 mod 3, 5.1 mod -3, -5.1 mod 3, -5.1 mod -3;
 select 5 mod 3, 5 mod -3, -5 mod 3, -5 mod -3;
 
 #
-# Bug #20924: UNSIGNED values in GREATEST() and LEAST() are treated as SIGNED
+# Bug #20924: CAST(expr as UNSIGNED) returns SIGNED value when used in various
+# functions
+# - UNSIGNED values in GREATEST() and LEAST() are treated as SIGNED
 #
 SELECT GREATEST(1, 18446744073709551615);
 SELECT LEAST(1, 18446744073709551615);
 
-# End of 4.1 tests
+--echo End of 4.1 tests

mysql-test/t/user_var.test

@@ -142,9 +142,11 @@ select @@global.version;
 select @@session.VERSION;
 
 #
-# Bug #20924 SET on a user variable saves UNSIGNED as SIGNED
+# Bug #20924: CAST(expr as UNSIGNED) returns SIGNED value when used in various
+# functions
+# - SET on a user variable saves UNSIGNED as SIGNED
 #
 set @a=18446744073709551615;
 select @a;
 
-# End of 4.1 tests
+--echo End of 4.1 tests

sql/item_func.cc

@@ -1252,8 +1252,7 @@ longlong Item_func_min_max::val_int()
     {
       if (args[i]->null_value)
         continue;
-      if (unsigned_flag && arg_unsigned_flag ||
-          (!unsigned_flag && !arg_unsigned_flag))
+      if (unsigned_flag == arg_unsigned_flag)
         cmp= tmp < value;
       else if (unsigned_flag)
         cmp= compare_int_signed_unsigned(tmp, value) < 0;
@@ -2614,7 +2613,7 @@ Item_func_set_user_var::update()
   case REAL_RESULT:
   {
     res= update_hash((void*) &save_result.vreal,sizeof(save_result.vreal),
-		     REAL_RESULT, &my_charset_bin, DERIVATION_IMPLICIT);
+		     REAL_RESULT, &my_charset_bin, DERIVATION_IMPLICIT, 0);
     break;
   }
   case INT_RESULT:
@@ -2628,12 +2627,12 @@ Item_func_set_user_var::update()
   {
     if (!save_result.vstr)					// Null value
       res= update_hash((void*) 0, 0, STRING_RESULT, &my_charset_bin,
-		       DERIVATION_IMPLICIT);
+		       DERIVATION_IMPLICIT, 0);
     else
       res= update_hash((void*) save_result.vstr->ptr(),
 		       save_result.vstr->length(), STRING_RESULT,
 		       save_result.vstr->charset(),
-		       DERIVATION_IMPLICIT);
+		       DERIVATION_IMPLICIT, 0);
     break;
   }
   case ROW_RESULT:

sql/item_func.h

@@ -962,7 +962,7 @@ public:
   longlong val_int();
   String *val_str(String *str);
   bool update_hash(void *ptr, uint length, enum Item_result type, 
-  		   CHARSET_INFO *cs, Derivation dv, bool unsigned_arg= 0);
+  		   CHARSET_INFO *cs, Derivation dv, bool unsigned_arg);
   bool check();
   bool update();
   enum Item_result result_type () const { return cached_result_type; }

sql/log_event.cc

@@ -2607,7 +2607,7 @@ int User_var_log_event::exec_event(struct st_relay_log_info* rli)
     a single record and with a single column. Thus, like
     a column value, it could always have IMPLICIT derivation.
    */
-  e.update_hash(val, val_len, type, charset, DERIVATION_IMPLICIT);
+  e.update_hash(val, val_len, type, charset, DERIVATION_IMPLICIT, 0);
   free_root(thd->mem_root,0);
 
   rli->inc_event_relay_log_pos(get_event_len());