fixed Bug #4358 Problem with HAVING clause that uses alias

       from the select list and TEXT field 

make setup_copy_fields to insert Item_copy_string for blobs in 
the beginning of the copy_funcs (push_back instead of push_front)

the thing is that Item_copy_string::copy for function can call 
Item_copy_string::val_int for blob via Item_ref.
But if Item_copy_string::copy for blob isn't called before, 
it's value will be wrong.

So all the Item_copy_string::copy for blobs should be called before 
Item_copy_string::copy for functions.

mysql-test/r/having.result

@@ -78,3 +78,43 @@ sqty
 5
 9
 drop table t1;
+CREATE TABLE t1 (
+`id` bigint(20) NOT NULL default '0',
+`description` text
+) TYPE=MyISAM;
+CREATE TABLE t2 (
+`id` bigint(20) NOT NULL default '0',
+`description` varchar(20)
+) TYPE=MyISAM;
+INSERT INTO t1  VALUES (1, 'test');
+INSERT INTO t2 VALUES (1, 'test');
+CREATE TABLE t3 (
+`id`       bigint(20) NOT NULL default '0',
+`order_id` bigint(20) NOT NULL default '0'
+) TYPE=MyISAM;
+select
+a.id, a.description,
+count(b.id) as c 
+from t1 a left join t3 b on a.id=b.order_id 
+group by a.id, a.description 
+having (a.description is not null) and (c=0);
+id	description	c
+1	test	0
+select
+a.*, 
+count(b.id) as c 
+from t2 a left join t3 b on a.id=b.order_id 
+group by a.id, a.description
+having (a.description is not null) and (c=0);
+id	description	c
+1	test	0
+INSERT INTO t1  VALUES (2, 'test2');
+select
+a.id, a.description,
+count(b.id) as c 
+from t1 a left join t3 b on a.id=b.order_id 
+group by a.id, a.description 
+having (a.description is not null) and (c=0);
+id	description	c
+1	test	0
+2	test2	0

mysql-test/t/having.test

@@ -66,3 +66,49 @@ select id, sum(qty) as sqty from t1 group by id having sqty>2;
 select sum(qty) as sqty from t1 group by id having count(id) > 0;
 select sum(qty) as sqty from t1 group by id having count(distinct id) > 0;
 drop table t1;
+
+#
+# Test case for Bug #4358 Problem with HAVING clause that uses alias from the
+#              select list and TEXT field 
+#
+
+CREATE TABLE t1 (
+  `id` bigint(20) NOT NULL default '0',
+  `description` text
+) TYPE=MyISAM;
+
+CREATE TABLE t2 (
+  `id` bigint(20) NOT NULL default '0',
+  `description` varchar(20)
+) TYPE=MyISAM;
+
+INSERT INTO t1  VALUES (1, 'test');
+INSERT INTO t2 VALUES (1, 'test');
+
+CREATE TABLE t3 (
+  `id`       bigint(20) NOT NULL default '0',
+  `order_id` bigint(20) NOT NULL default '0'
+) TYPE=MyISAM;
+
+select
+	a.id, a.description,
+	count(b.id) as c 
+from t1 a left join t3 b on a.id=b.order_id 
+group by a.id, a.description 
+having (a.description is not null) and (c=0);
+
+select
+	a.*, 
+	count(b.id) as c 
+from t2 a left join t3 b on a.id=b.order_id 
+group by a.id, a.description
+having (a.description is not null) and (c=0);
+
+INSERT INTO t1  VALUES (2, 'test2');
+
+select
+	a.id, a.description,
+	count(b.id) as c 
+from t1 a left join t3 b on a.id=b.order_id 
+group by a.id, a.description 
+having (a.description is not null) and (c=0);

sql/sql_select.cc

@@ -7158,7 +7158,16 @@ setup_copy_fields(THD *thd, TMP_TABLE_PARAM *param, List<Item> &fields)
 	if (!(pos=new Item_copy_string(pos)))
 	  goto err;
 	VOID(li.replace(pos));
-	if (param->copy_funcs.push_back(pos))
+       /*
+         Item_copy_string::copy for function can call 
+         Item_copy_string::val_int for blob via Item_ref.
+         But if Item_copy_string::copy for blob isn't called before,
+         it's value will be wrong
+         so let's insert Item_copy_string for blobs in the beginning of 
+         copy_funcs
+         (to see full test case look at having.test, BUG #4358) 
+       */
+	if (param->copy_funcs.push_front(pos))
 	  goto err;
 	continue;
       }