fix of BUG#11111 fix

sql/item.h:
  revrited as recursive
sql/sql_select.cc:
  real_type is virtual
tests/mysql_client_test.c:
  check results abd delete views

sql/item.h

@@ -1352,12 +1352,9 @@ public:
   {
     (*ref)->save_in_field(result_field, no_conversions);
   }
-  Item *real_item() {
-    Item *item= this;
-    do
-      item= *((Item_ref *)item)->ref;
-    while (item->type() == Item::REF_ITEM);
-    return item;
+  Item *real_item()
+  {
+    return (*ref)->real_item();
   }
   bool walk(Item_processor processor, byte *arg)
   { return (*ref)->walk(processor, arg); }

sql/sql_select.cc

@@ -7958,7 +7958,7 @@ Field *create_tmp_field(THD *thd, TABLE *table,Item *item, Item::Type type,
                                        convert_blob_length);
   }
   case Item::REF_ITEM:
-    if ( ((Item_ref*)item)->real_item()->type() == Item::FIELD_ITEM)
+    if ( item->real_item()->type() == Item::FIELD_ITEM)
     {
       Item_field *field= (Item_field*) *((Item_ref*)item)->ref;
       Field *new_field= create_tmp_field_from_field(thd, 

tests/mysql_client_test.c

@@ -13156,14 +13156,24 @@ static void test_bug11111()
   char		buf[2][20];
   long		len[2];
   int i;
+  int rc;
   const char * query = "SELECT DISTINCT f1,ff2 FROM v1";
+  myheader("test_bug11111");
 
-  mysql_query(mysql, "drop table if exists t1, t2, v1");
-  mysql_query(mysql, "create table t1 (f1 int, f2 int)");
-  mysql_query(mysql, "create table t2 (ff1 int, ff2 int)");
-  mysql_query(mysql, "create view v1 as select * from t1, t2 where f1=ff1");
-  mysql_query(mysql, "insert into t1 values (1,1), (2,2), (3,3)");
-  mysql_query(mysql, "insert into t2 values (1,1), (2,2), (3,3)");
+  rc= mysql_query(mysql, "drop table if exists t1, t2, v1");
+  myquery(rc);
+  rc= mysql_query(mysql, "drop view if exists t1, t2, v1");
+  myquery(rc);
+  rc= mysql_query(mysql, "create table t1 (f1 int, f2 int)");
+  myquery(rc);
+  rc= mysql_query(mysql, "create table t2 (ff1 int, ff2 int)");
+  myquery(rc);
+  rc= mysql_query(mysql, "create view v1 as select * from t1, t2 where f1=ff1");
+  myquery(rc);
+  rc= mysql_query(mysql, "insert into t1 values (1,1), (2,2), (3,3)");
+  myquery(rc);
+  rc= mysql_query(mysql, "insert into t2 values (1,1), (2,2), (3,3)");
+  myquery(rc);
 
   stmt = mysql_stmt_init(mysql);
 
@@ -13182,9 +13192,13 @@ static void test_bug11111()
     printf("Error: %s\n", mysql_stmt_error(stmt));
 
   mysql_stmt_fetch(stmt);
+  printf("return: %s", buf[1]);
   DIE_UNLESS(!strcmp(buf[1],"1"));
   mysql_stmt_close(stmt);
-  mysql_query(mysql, "drop table t1, t2, v1");
+  rc= mysql_query(mysql, "drop view v1");
+  myquery(rc);
+  rc= mysql_query(mysql, "drop table t1, t2");
+  myquery(rc);
 }
 
 /*