After merge fixes

mysql-test/r/group_by.result:
  After merge fix
  (Put test in same order as in 4.1)
mysql-test/t/group_by.test:
  After merge fix
  (Put test in same order as in 4.1)
sql/item_cmpfunc.cc:
  After merge fix (+ simple fix to not allow compiler to do tail optimization)
sql/item_cmpfunc.h:
  After merge fix

mysql-test/r/group_by.result

@@ -723,6 +723,34 @@ WHERE hostname LIKE '%aol%'
 hostname	no
 cache-dtc-af05.proxy.aol.com	1
 DROP TABLE t1;
+CREATE TABLE t1 (a  int, b int);
+INSERT INTO t1 VALUES (1,2), (1,3);
+SELECT a, b FROM t1 GROUP BY 'const';
+a	b
+1	2
+SELECT DISTINCT a, b FROM t1 GROUP BY 'const';
+a	b
+1	2
+DROP TABLE t1;
+CREATE TABLE t1 (id INT, dt DATETIME);
+INSERT INTO t1 VALUES ( 1, '2005-05-01 12:30:00' );
+INSERT INTO t1 VALUES ( 1, '2005-05-01 12:30:00' );
+INSERT INTO t1 VALUES ( 1, '2005-05-01 12:30:00' );
+INSERT INTO t1 VALUES ( 1, '2005-05-01 12:30:00' );
+SELECT dt DIV 1 AS f, id FROM t1 GROUP BY f;
+f	id
+20050501123000	1
+DROP TABLE t1;
+CREATE TABLE t1 (id varchar(20) NOT NULL);
+INSERT INTO t1 VALUES ('trans1'), ('trans2');
+CREATE TABLE t2 (id varchar(20) NOT NULL, err_comment blob NOT NULL);
+INSERT INTO t2 VALUES ('trans1', 'a problem');
+SELECT COUNT(DISTINCT(t1.id)), LEFT(err_comment, 256) AS comment
+FROM t1 LEFT JOIN t2 ON t1.id=t2.id GROUP BY comment;
+COUNT(DISTINCT(t1.id))	comment
+1	NULL
+1	a problem
+DROP TABLE t1, t2;
 CREATE TABLE t1 (n int);
 INSERT INTO t1 VALUES (1);
 SELECT n+1 AS n FROM t1 GROUP BY n;
@@ -752,31 +780,3 @@ aaa
 show warnings;
 Level	Code	Message
 drop table t1, t2;
-CREATE TABLE t1 (a  int, b int);
-INSERT INTO t1 VALUES (1,2), (1,3);
-SELECT a, b FROM t1 GROUP BY 'const';
-a	b
-1	2
-SELECT DISTINCT a, b FROM t1 GROUP BY 'const';
-a	b
-1	2
-DROP TABLE t1;
-CREATE TABLE t1 (id INT, dt DATETIME);
-INSERT INTO t1 VALUES ( 1, '2005-05-01 12:30:00' );
-INSERT INTO t1 VALUES ( 1, '2005-05-01 12:30:00' );
-INSERT INTO t1 VALUES ( 1, '2005-05-01 12:30:00' );
-INSERT INTO t1 VALUES ( 1, '2005-05-01 12:30:00' );
-SELECT dt DIV 1 AS f, id FROM t1 GROUP BY f;
-f	id
-20050501123000	1
-DROP TABLE t1;
-CREATE TABLE t1 (id varchar(20) NOT NULL);
-INSERT INTO t1 VALUES ('trans1'), ('trans2');
-CREATE TABLE t2 (id varchar(20) NOT NULL, err_comment blob NOT NULL);
-INSERT INTO t2 VALUES ('trans1', 'a problem');
-SELECT COUNT(DISTINCT(t1.id)), LEFT(err_comment, 256) AS comment
-FROM t1 LEFT JOIN t2 ON t1.id=t2.id GROUP BY comment;
-COUNT(DISTINCT(t1.id))	comment
-1	NULL
-1	a problem
-DROP TABLE t1, t2;

mysql-test/t/group_by.test

@@ -543,39 +543,6 @@ SELECT hostname, COUNT(DISTINCT user_id) as no FROM t1
 DROP TABLE t1;
 
 #
-# Bug#11211: Ambiguous column reference in GROUP BY.
-#
-
-create table t1 (c1 char(3), c2 char(3));
-create table t2 (c3 char(3), c4 char(3));
-insert into t1 values ('aaa', 'bb1'), ('aaa', 'bb2');
-insert into t2 values ('aaa', 'bb1'), ('aaa', 'bb2');
-
-# query with ambiguous column reference 'c2'
---disable_ps_protocol
-select t1.c1 as c2 from t1, t2 where t1.c2 = t2.c4
-group by c2;
-show warnings;
---enable_ps_protocol
-
-# this query has no ambiguity
-select t1.c1 as c2 from t1, t2 where t1.c2 = t2.c4
-group by t1.c1;
-
-show warnings;
-drop table t1, t2;
-
-#
-# Test for bug #11414: crash on Windows for a simple GROUP BY query 
-#  
-                    
-CREATE TABLE t1 (n int);
-INSERT INTO t1 VALUES (1);
---disable_ps_protocol
-SELECT n+1 AS n FROM t1 GROUP BY n;
---enable_ps_protocol
-DROP TABLE t1;
-
 # Test for bug #8614: GROUP BY 'const' with DISTINCT  
 #
 
@@ -613,3 +580,38 @@ SELECT COUNT(DISTINCT(t1.id)), LEFT(err_comment, 256) AS comment
   FROM t1 LEFT JOIN t2 ON t1.id=t2.id GROUP BY comment;
 
 DROP TABLE t1, t2;
+
+#
+# Test for bug #11414: crash on Windows for a simple GROUP BY query 
+#  
+                    
+CREATE TABLE t1 (n int);
+INSERT INTO t1 VALUES (1);
+--disable_ps_protocol
+SELECT n+1 AS n FROM t1 GROUP BY n;
+--enable_ps_protocol
+DROP TABLE t1;
+
+#
+# Bug#11211: Ambiguous column reference in GROUP BY.
+#
+
+create table t1 (c1 char(3), c2 char(3));
+create table t2 (c3 char(3), c4 char(3));
+insert into t1 values ('aaa', 'bb1'), ('aaa', 'bb2');
+insert into t2 values ('aaa', 'bb1'), ('aaa', 'bb2');
+
+# query with ambiguous column reference 'c2'
+--disable_ps_protocol
+select t1.c1 as c2 from t1, t2 where t1.c2 = t2.c4
+group by c2;
+show warnings;
+--enable_ps_protocol
+
+# this query has no ambiguity
+select t1.c1 as c2 from t1, t2 where t1.c2 = t2.c4
+group by t1.c1;
+
+show warnings;
+drop table t1, t2;
+

sql/item_cmpfunc.cc

@@ -1578,17 +1578,21 @@ my_decimal *Item_func_case::val_decimal(my_decimal *decimal_value)
 }
 
 
-bool Item_func_case::fix_fields(THD *thd, struct st_table_list *tables,
-                                Item **ref)
+bool Item_func_case::fix_fields(THD *thd, Item **ref)
 {
   /*
     buff should match stack usage from
     Item_func_case::val_int() -> Item_func_case::find_item()
   */
   char buff[MAX_FIELD_WIDTH*2+sizeof(String)*2+sizeof(String*)*2+sizeof(double)*2+sizeof(longlong)*2];
+  bool res= Item_func::fix_fields(thd, ref);
+  /*
+    Call check_stack_overrun after fix_fields to be sure that stack variable
+    is not optimized away
+  */
   if (check_stack_overrun(thd, STACK_MIN_SIZE, buff))
     return TRUE;				// Fatal error flag is set!
-  return Item_func::fix_fields(thd, tables, ref);
+  return res;
 }
 
 

sql/item_cmpfunc.h

@@ -566,7 +566,7 @@ public:
   longlong val_int();
   String *val_str(String *);
   my_decimal *val_decimal(my_decimal *);
-  bool fix_fields(THD *thd,struct st_table_list *tlist, Item **ref);
+  bool fix_fields(THD *thd, Item **ref);
   void fix_length_and_dec();
   uint decimal_precision() const;
   table_map not_null_tables() const { return 0; }