Merge bk-internal:/home/bk/mysql-5.1-opt

into  dl145s.mysql.com:/dev/shm/mhansson/my51-bug27741-mpush

mysql-test/r/alter_table.result

@@ -1103,3 +1103,17 @@ Field	Type	Null	Key	Default	Extra
 unsigned_int_field	bigint(20) unsigned	NO	MUL		
 char_field	char(10)	YES		NULL	
 DROP TABLE t2;
+CREATE TABLE t1 (f1 INT, f2 INT, f3 INT);
+INSERT INTO t1 VALUES (1, 2, NULL);
+SELECT * FROM t1;
+f1	f2	f3
+1	2	NULL
+ALTER TABLE t1 MODIFY COLUMN f3 INT AFTER f1;
+SELECT * FROM t1;
+f1	f3	f2
+1	NULL	2
+ALTER TABLE t1 MODIFY COLUMN f3 INT AFTER f2;
+SELECT * FROM t1;
+f1	f2	f3
+1	2	NULL
+DROP TABLE t1;

mysql-test/r/user_var.result

@@ -317,10 +317,39 @@ SHOW COUNT(*) WARNINGS;
 SHOW COUNT(*) ERRORS;
 @@session.error_count
 1
-create table t1(f1 int);
-insert into t1 values(1),(1),(2);
-select @a:=f1, count(f1) from t1 group by 1 order by 1;
+create table t1(f1 int, f2 varchar(2), f3 float, f4 decimal(2,1));
+insert into t1 values 
+(1, "a", 1.5, 1.6), (1, "a", 1.5, 1.6), (2, "b", 2.5, 2.6),
+(3, "c", 3.5, 3.6), (4, "d", 4.5, 4.6), (1, "a", 1.5, 1.6),
+(3, "c", 3.5, 3.6), (1, "a", 1.5, 1.6);
+select @a:=f1, count(f1) from t1 group by 1 desc;
 @a:=f1	count(f1)
-1	2
+4	1
+3	2
 2	1
+1	4
+select @a:=f1, count(f1) from t1 group by 1 asc;
+@a:=f1	count(f1)
+1	4
+2	1
+3	2
+4	1
+select @a:=f2, count(f2) from t1 group by 1 desc;
+@a:=f2	count(f2)
+d	1
+c	2
+b	1
+a	4
+select @a:=f3, count(f3) from t1 group by 1 desc;
+@a:=f3	count(f3)
+4.5	1
+3.5	2
+2.5	1
+1.5	4
+select @a:=f4, count(f4) from t1 group by 1 desc;
+@a:=f4	count(f4)
+4.6	1
+3.6	2
+2.6	1
+1.6	4
 drop table t1;

mysql-test/t/alter_table.test

@@ -839,3 +839,15 @@ ALTER TABLE t2 MODIFY unsigned_int_field BIGINT UNSIGNED NOT NULL;
 DESCRIBE t2;
 
 DROP TABLE t2;
+
+#
+# Bug#28427: Columns were renamed instead of moving by ALTER TABLE.
+#
+CREATE TABLE t1 (f1 INT, f2 INT, f3 INT);
+INSERT INTO t1 VALUES (1, 2, NULL);
+SELECT * FROM t1;
+ALTER TABLE t1 MODIFY COLUMN f3 INT AFTER f1;
+SELECT * FROM t1;
+ALTER TABLE t1 MODIFY COLUMN f3 INT AFTER f2;
+SELECT * FROM t1;
+DROP TABLE t1;

mysql-test/t/user_var.test

@@ -226,7 +226,14 @@ SHOW COUNT(*) ERRORS;
 #
 # Bug#28494: Grouping by Item_func_set_user_var produces incorrect result.
 #
-create table t1(f1 int);
-insert into t1 values(1),(1),(2);
-select @a:=f1, count(f1) from t1 group by 1 order by 1;
+create table t1(f1 int, f2 varchar(2), f3 float, f4 decimal(2,1));
+insert into t1 values 
+  (1, "a", 1.5, 1.6), (1, "a", 1.5, 1.6), (2, "b", 2.5, 2.6),
+  (3, "c", 3.5, 3.6), (4, "d", 4.5, 4.6), (1, "a", 1.5, 1.6),
+  (3, "c", 3.5, 3.6), (1, "a", 1.5, 1.6);
+select @a:=f1, count(f1) from t1 group by 1 desc;
+select @a:=f1, count(f1) from t1 group by 1 asc;
+select @a:=f2, count(f2) from t1 group by 1 desc;
+select @a:=f3, count(f3) from t1 group by 1 desc;
+select @a:=f4, count(f4) from t1 group by 1 desc;
 drop table t1;

sql/item_func.cc

@@ -3799,6 +3799,23 @@ Item_func_set_user_var::fix_length_and_dec()
 }
 
 
+/*
+  Mark field in read_map
+
+  NOTES
+    This is used by filesort to register used fields in a a temporary
+    column read set or to register used fields in a view
+*/
+
+bool Item_func_set_user_var::register_field_in_read_map(uchar *arg)
+{
+  TABLE *table= (TABLE *) arg;
+  if (result_field->table == table || !table)
+    bitmap_set_bit(result_field->table->read_set, result_field->field_index);
+  return 0;
+}
+
+
 /*
   Set value to user variable.
 
@@ -4035,7 +4052,8 @@ bool
 Item_func_set_user_var::check(bool use_result_field)
 {
   DBUG_ENTER("Item_func_set_user_var::check");
-  DBUG_ASSERT(!use_result_field || result_field);
+  if (use_result_field && !result_field)
+    use_result_field= FALSE;
 
   switch (cached_result_type) {
   case REAL_RESULT:
@@ -4179,6 +4197,40 @@ my_decimal *Item_func_set_user_var::val_decimal(my_decimal *val)
 }
 
 
+double Item_func_set_user_var::val_result()
+{
+  DBUG_ASSERT(fixed == 1);
+  check(TRUE);
+  update();					// Store expression
+  return entry->val_real(&null_value);
+}
+
+longlong Item_func_set_user_var::val_int_result()
+{
+  DBUG_ASSERT(fixed == 1);
+  check(TRUE);
+  update();					// Store expression
+  return entry->val_int(&null_value);
+}
+
+String *Item_func_set_user_var::str_result(String *str)
+{
+  DBUG_ASSERT(fixed == 1);
+  check(TRUE);
+  update();					// Store expression
+  return entry->val_str(&null_value, str, decimals);
+}
+
+
+my_decimal *Item_func_set_user_var::val_decimal_result(my_decimal *val)
+{
+  DBUG_ASSERT(fixed == 1);
+  check(TRUE);
+  update();					// Store expression
+  return entry->val_decimal(&null_value, val);
+}
+
+
 void Item_func_set_user_var::print(String *str)
 {
   str->append(STRING_WITH_LEN("(@"));

sql/item_func.h

@@ -1236,6 +1236,10 @@ class Item_func_set_user_var :public Item_func
   longlong val_int();
   String *val_str(String *str);
   my_decimal *val_decimal(my_decimal *);
+  double val_result();
+  longlong val_int_result();
+  String *str_result(String *str);
+  my_decimal *val_decimal_result(my_decimal *);
   bool update_hash(void *ptr, uint length, enum Item_result type,
   		   CHARSET_INFO *cs, Derivation dv, bool unsigned_arg);
   bool send(Protocol *protocol, String *str_arg);
@@ -1255,6 +1259,7 @@ class Item_func_set_user_var :public Item_func
     return save_in_field(field, no_conversions, 1);
   }
   void save_org_in_field(Field *field) { (void)save_in_field(field, 1, 0); }
+  bool register_field_in_read_map(uchar *arg);
 };
 
 

sql/mysqld.cc

@@ -3805,6 +3805,11 @@ we force server id to 2, but this MySQL server will not act as a slave.");
     freopen(log_error_file,"a+",stderr);
     FreeConsole();				// Remove window
   }
+  else
+  {
+    /* Don't show error dialog box when on foreground: it stops the server */ 
+    SetErrorMode(SEM_NOOPENFILEERRORBOX | SEM_FAILCRITICALERRORS);
+  }
 #endif
 
   /*

sql/sql_table.cc

@@ -5932,6 +5932,7 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
         goto err;
       }
       find_it.after(def);			// Put element after this
+      need_copy_table= ALTER_TABLE_DATA_CHANGED;
     }
   }
   if (alter_info->alter_list.elements)
@@ -6170,12 +6171,14 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
            (uint*) thd->alloc(sizeof(uint) * prepared_key_list.elements)))
       goto err;
     /* Check how much the tables differ. */
-    need_copy_table= compare_tables(table, &prepared_create_list,
+    uint res= compare_tables(table, &prepared_create_list,
                                     key_info_buffer, key_count,
                                     create_info, alter_info, order_num,
                                     index_drop_buffer, &index_drop_count,
                                     index_add_buffer, &index_add_count,
                                     varchar);
+    if (!need_copy_table)
+      need_copy_table= res;
   }
 
   /*