4.0 -> 4.1 merge

sql/item_strfunc.cc:
  Auto merged
mysql-test/r/func_str.result:
  merged test results for QUOTE() buf fix
mysql-test/t/func_str.test:
  merged test for QUOTE() buf fix

mysql-test/r/func_str.result

@@ -691,3 +691,10 @@ select count(*) as total, left(c,10) as reg from t1 group by reg order by reg de
 total	reg
 10	2004-12-10
 drop table t1;
+
+select quote(ltrim(concat('    ', 'a')));
+quote(ltrim(concat('    ', 'a')))
+'a'
+select quote(trim(concat('    ', 'a')));
+quote(trim(concat('    ', 'a')))
+'a'

mysql-test/t/func_str.test

@@ -429,3 +429,9 @@ create table t1 (a int not null primary key, b varchar(40), c datetime);
 insert into t1 (a,b,c) values (1,'Tom','2004-12-10 12:13:14'),(2,'ball games','2004-12-10 12:13:14'), (3,'Basil','2004-12-10 12:13:14'), (4,'Dean','2004-12-10 12:13:14'),(5,'Ellis','2004-12-10 12:13:14'), (6,'Serg','2004-12-10 12:13:14'), (7,'Sergei','2004-12-10 12:13:14'),(8,'Georg','2004-12-10 12:13:14'),(9,'Salle','2004-12-10 12:13:14'),(10,'Sinisa','2004-12-10 12:13:14'); 
 select count(*) as total, left(c,10) as reg from t1 group by reg order by reg desc limit 0,12;
 drop table t1;
+# crashing bug with QUOTE() and LTRIM() or TRIM() fixed
+# Bug #7495
+#
+
+select quote(ltrim(concat('    ', 'a')));
+select quote(trim(concat('    ', 'a')));

sql/item_strfunc.cc

@@ -2596,16 +2596,16 @@ String *Item_func_quote::val_str(String *str)
 
   /*
     We have to use realloc() instead of alloc() as we want to keep the
-    old result in str
+    old result in arg
   */
-  if (str->realloc(new_length))
+  if (arg->realloc(new_length))
     goto null;
 
   /*
     As 'arg' and 'str' may be the same string, we must replace characters
     from the end to the beginning
   */
-  to= (char*) str->ptr() + new_length - 1;
+  to= (char*) arg->ptr() + new_length - 1;
   *to--= '\'';
   for (start= (char*) arg->ptr(),end= start + arg_length; end-- != start; to--)
   {
@@ -2633,10 +2633,10 @@ String *Item_func_quote::val_str(String *str)
     }
   }
   *to= '\'';
-  str->length(new_length);
+  arg->length(new_length);
   str->set_charset(collation.collation);
   null_value= 0;
-  return str;
+  return arg;
 
 null:
   null_value= 1;