Merge polly.local:/tmp/20924/bug20294/my50-bug20294

into  polly.local:/tmp/20924/bug20294/my51-bug20294

mysql-test/r/case.result

@@ -200,3 +200,10 @@ CEMPNUM	EMPMUM1	EMPNUM2
 0.00	0	0.00
 2.00	2	NULL
 DROP TABLE t1,t2;
+SELECT CASE 1 WHEN 1 THEN 18446744073709551615 ELSE 1 END;
+CASE 1 WHEN 1 THEN 18446744073709551615 ELSE 1 END
+18446744073709551615
+SELECT COALESCE(18446744073709551615);
+COALESCE(18446744073709551615)
+18446744073709551615
+End of 4.1 tests

mysql-test/r/func_if.result

@@ -128,3 +128,10 @@ f1	f2	if(f1, 40.0, 5.00)
 0	0	5.00
 1	1	40.00
 drop table t1;
+SELECT IF(1 != 0, 18446744073709551615, 1);
+IF(1 != 0, 18446744073709551615, 1)
+18446744073709551615
+SELECT IFNULL(NULL, 18446744073709551615);
+IFNULL(NULL, 18446744073709551615)
+18446744073709551615
+End of 4.1 tests

mysql-test/r/func_test.result

@@ -204,3 +204,10 @@ NULL
 SELECT GREATEST(1.5E+2,1.3E+2,NULL) FROM DUAL;
 GREATEST(1.5E+2,1.3E+2,NULL)
 NULL
+SELECT GREATEST(1, 18446744073709551615);
+GREATEST(1, 18446744073709551615)
+18446744073709551615
+SELECT LEAST(1, 18446744073709551615);
+LEAST(1, 18446744073709551615)
+1
+End of 4.1 tests

mysql-test/r/user_var.result

@@ -301,3 +301,4 @@ select @var;
 @var
 3
 drop table t1;
+End of 4.1 tests

mysql-test/t/case.test

@@ -133,8 +133,6 @@ select min(a), min(case when 1=1 then a else NULL end),
 from t1 where b=3 group by b;
 drop table t1;
 
-# End of 4.1 tests
-
 
 #
 # Tests for bug #9939: conversion of the arguments for COALESCE and IFNULL
@@ -154,3 +152,12 @@ SELECT IFNULL(t2.EMPNUM,t1.EMPNUM) AS CEMPNUM,
   FROM t1 LEFT JOIN t2 ON t1.EMPNUM=t2.EMPNUM;
 
 DROP TABLE t1,t2;
+#
+# 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);
+
+--echo End of 4.1 tests

mysql-test/t/func_if.test

@@ -97,3 +97,18 @@ create table t1 (f1 int, f2 int);
 insert into t1 values(1,1),(0,0);
 select f1, f2, if(f1, 40.0, 5.00) from t1 group by f1 order by f2;
 drop table t1;
+#
+# 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: CAST(expr as UNSIGNED) returns SIGNED value when used in various
+# functions
+# - UNSIGNED values in IFNULL() are treated as SIGNED
+#
+SELECT IFNULL(NULL, 18446744073709551615);
+
+--echo End of 4.1 tests

mysql-test/t/func_test.test

@@ -108,8 +108,6 @@ 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;
 
-# End of 4.1 tests
-
 #
 # Bug#6726: NOT BETWEEN parse failure
 #
@@ -127,3 +125,13 @@ SELECT GREATEST(1,NULL) FROM DUAL;
 SELECT LEAST('xxx','aaa',NULL,'yyy') FROM DUAL;
 SELECT LEAST(1.1,1.2,NULL,1.0) FROM DUAL;
 SELECT GREATEST(1.5E+2,1.3E+2,NULL) FROM DUAL;
+
+#
+# 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);
+
+--echo End of 4.1 tests

mysql-test/t/user_var.test

@@ -144,8 +144,6 @@ select @@version;
 --replace_column 1 #
 select @@global.version;
 
-# End of 4.1 tests
-
 #
 # Bug #6598: problem with cast(NULL as signed integer);
 #
@@ -212,3 +210,5 @@ insert into t1 values (1,2),(2,3),(3,1);
 select @var:=f2 from t1 group by f1 order by f2 desc limit 1;
 select @var;
 drop table t1;
+
+--echo End of 4.1 tests

sql/item_cmpfunc.cc

@@ -745,11 +745,7 @@ int Arg_comparator::compare_int_signed_unsigned()
     if (!(*b)->null_value)
     {
       owner->null_value= 0;
-      if (sval1 < 0 || (ulonglong)sval1 < uval2)
-        return -1;
-      if ((ulonglong)sval1 == uval2)
-        return 0;
-      return 1;
+      return ::compare_int_signed_unsigned(sval1, uval2);
     }
   }
   owner->null_value= 1;
@@ -770,13 +766,7 @@ int Arg_comparator::compare_int_unsigned_signed()
     if (!(*b)->null_value)
     {
       owner->null_value= 0;
-      if (sval2 < 0)
-        return 1;
-      if (uval1 < (ulonglong)sval2)
-        return -1;
-      if (uval1 == (ulonglong)sval2)
-        return 0;
-      return 1;
+      return ::compare_int_unsigned_signed(uval1, sval2);
     }
   }
   owner->null_value= 1;
@@ -1417,11 +1407,13 @@ Item_func_ifnull::int_op()
   if (!args[0]->null_value)
   {
     null_value=0;
+    unsigned_flag= args[0]->unsigned_flag;
     return value;
   }
   value=args[1]->val_int();
   if ((null_value=args[1]->null_value))
     return 0;
+  unsigned_flag= args[1]->unsigned_flag;
   return value;
 }
 
@@ -1572,6 +1564,7 @@ Item_func_if::val_int()
   Item *arg= args[0]->val_bool() ? args[1] : args[2];
   longlong value=arg->val_int();
   null_value=arg->null_value;
+  unsigned_flag= arg->unsigned_flag;
   return value;
 }
 
@@ -1820,6 +1813,7 @@ longlong Item_func_case::val_int()
   }
   res=item->val_int();
   null_value=item->null_value;
+  unsigned_flag= item->unsigned_flag;
   return res;
 }
 
@@ -2006,7 +2000,10 @@ longlong Item_func_coalesce::int_op()
   {
     longlong res=args[i]->val_int();
     if (!args[i]->null_value)
+    {
+      unsigned_flag= args[i]->unsigned_flag;  
       return res;
+    }
   }
   null_value=1;
   return 0;

sql/item_cmpfunc.h

@@ -1411,3 +1411,17 @@ inline Item *and_conds(Item *a, Item *b)
 }
 
 Item *and_expressions(Item *a, Item *b, Item **org_item);
+
+inline int compare_int_signed_unsigned(longlong sval, ulonglong uval)
+{
+  if (sval < 0 || (ulonglong)sval < uval)
+    return -1;
+  if ((ulonglong)sval == uval)
+    return 0;
+  return 1;
+}
+
+inline int compare_int_unsigned_signed(ulonglong uval, longlong sval)
+{
+  return -compare_int_signed_unsigned(sval, uval);
+}

sql/item_func.cc

@@ -2169,18 +2169,33 @@ longlong Item_func_min_max::val_int()
 {
   DBUG_ASSERT(fixed == 1);
   longlong value=0;
+  my_bool arg_unsigned_flag;
+  my_bool cmp;
   for (uint i=0; i < arg_count ; i++)
   {
+    longlong tmp= args[i]->val_int();
+    if ((null_value= args[i]->null_value))
+      break;
+    arg_unsigned_flag= args[i]->unsigned_flag;
     if (i == 0)
-      value=args[i]->val_int();
+    {
+      value= tmp;
+      unsigned_flag= arg_unsigned_flag;
+    }
     else
     {
-      longlong tmp=args[i]->val_int();
-      if (!args[i]->null_value && (tmp < value ? cmp_sign : -cmp_sign) > 0)
-	value=tmp;
+      if (unsigned_flag == arg_unsigned_flag)
+        cmp= tmp < value;
+      else if (unsigned_flag)
+        cmp= compare_int_signed_unsigned(tmp, value) < 0;
+      else
+        cmp= compare_int_unsigned_signed(tmp, value) < 0;
+      if ((cmp ? cmp_sign : -cmp_sign) > 0)
+      {
+        value= tmp;
+        unsigned_flag= arg_unsigned_flag;
+      }
     }
-    if ((null_value= args[i]->null_value))
-      break;
   }
   return value;
 }
@@ -3821,7 +3836,7 @@ 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:
@@ -3835,23 +3850,23 @@ 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 DECIMAL_RESULT:
   {
     if (!save_result.vdec)					// Null value
       res= update_hash((void*) 0, 0, DECIMAL_RESULT, &my_charset_bin,
-                       DERIVATION_IMPLICIT);
+                       DERIVATION_IMPLICIT, 0);
     else
       res= update_hash((void*) save_result.vdec,
                        sizeof(my_decimal), DECIMAL_RESULT,
-                       &my_charset_bin, DERIVATION_IMPLICIT);
+                       &my_charset_bin, DERIVATION_IMPLICIT, 0);
     break;
   }
   case ROW_RESULT:

sql/item_func.h

@@ -1202,7 +1202,7 @@ public:
   String *val_str(String *str);
   my_decimal *val_decimal(my_decimal *);
   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 send(Protocol *protocol, String *str_arg);
   void make_field(Send_field *tmp_field);
   bool check(bool use_result_field);

sql/log_event.cc

@@ -3923,7 +3923,7 @@ 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();