Fixed bug #19573.

The select statement that specified a view could be
slightly changed when the view was saved in a frm file.
In particular references to an alias name in the HAVING
clause could be substituted for the expression named by
this alias.
This could result in an error message for a query of
the form SELECT * FROM <view>. Yet no such message
appeared when executing the query specifying the view.

mysql-test/r/having.result

@@ -12,7 +12,7 @@ explain extended select count(a) as b from t1 where a=0 having b >=0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
 Warnings:
-Note	1003	select count(`test`.`t1`.`a`) AS `b` from `test`.`t1` where 0 having (count(`test`.`t1`.`a`) >= 0)
+Note	1003	select count(`test`.`t1`.`a`) AS `b` from `test`.`t1` where 0 having (`b` >= 0)
 drop table t1;
 CREATE TABLE t1 (
 raw_id int(10) NOT NULL default '0',

mysql-test/r/view.result

@@ -2660,3 +2660,28 @@ SELECT * FROM v1;
 id	t	COUNT(*)
 DROP VIEW v1;
 DROP TABLE t1;
+CREATE TABLE t1(
+fName varchar(25) NOT NULL,
+lName varchar(25) NOT NULL,
+DOB date NOT NULL,
+uID int unsigned NOT NULL AUTO_INCREMENT PRIMARY KEY);
+INSERT INTO t1(fName, lName, DOB) VALUES
+('Hank', 'Hill', '1964-09-29'),
+('Tom', 'Adams', '1908-02-14'),
+('Homer', 'Simpson', '1968-03-05');
+CREATE VIEW v1 AS
+SELECT (year(now())-year(DOB)) AS Age
+FROM t1 HAVING Age < 75;
+SHOW CREATE VIEW v1;
+View	Create View
+v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select sql_no_cache (year(now()) - year(`t1`.`DOB`)) AS `Age` from `t1` having (`Age` < 75)
+SELECT (year(now())-year(DOB)) AS Age FROM t1 HAVING Age < 75;
+Age
+42
+38
+SELECT * FROM v1;
+Age
+42
+38
+DROP VIEW v1;
+DROP TABLE t1;

mysql-test/t/view.test

@@ -2528,3 +2528,31 @@ SELECT * FROM v1;
 
 DROP VIEW v1;
 DROP TABLE t1;
+
+#
+# Bug #19573: VIEW with HAVING that refers an alias name
+# 
+
+CREATE TABLE t1(
+  fName varchar(25) NOT NULL,
+  lName varchar(25) NOT NULL,
+  DOB date NOT NULL,
+  uID int unsigned NOT NULL AUTO_INCREMENT PRIMARY KEY);
+ 
+INSERT INTO t1(fName, lName, DOB) VALUES
+  ('Hank', 'Hill', '1964-09-29'),
+  ('Tom', 'Adams', '1908-02-14'),
+  ('Homer', 'Simpson', '1968-03-05');
+
+CREATE VIEW v1 AS
+  SELECT (year(now())-year(DOB)) AS Age
+    FROM t1 HAVING Age < 75; 
+SHOW CREATE VIEW v1;           
+
+SELECT (year(now())-year(DOB)) AS Age FROM t1 HAVING Age < 75;
+SELECT * FROM v1;
+
+DROP VIEW v1;
+DROP TABLE t1;
+
+

sql/item.cc

@@ -4840,7 +4840,16 @@ void Item_ref::cleanup()
 void Item_ref::print(String *str)
 {
   if (ref)
+  {
+    if ((*ref)->type() != Item::CACHE_ITEM && ref_type() != VIEW_REF &&
+        name && alias_name_used)
+    {
+      THD *thd= current_thd;
+      append_identifier(thd, str, name, (uint) strlen(name));
+    }
+    else
       (*ref)->print(str);
+  }
   else
     Item_ident::print(str);
 }