fixed table invalidation in simple renaming

mysql-test/r/query_cache.result:
  test of simple renaming & QC
mysql-test/t/query_cache.test:
  test of simple renaming & QC

mysql-test/r/query_cache.result

@@ -542,3 +542,14 @@ select * from mysql.db;
 show status like "Qcache_queries_in_cache";
 Variable_name	Value
 Qcache_queries_in_cache	0
+create table t1(id int auto_increment primary key);
+insert into t1 values (NULL), (NULL), (NULL);
+select * from t1 where id=2;
+id
+2
+alter table t1 rename to t2;
+select * from t1 where id=2;
+Table 'test.t1' doesn't exist
+drop table t2;
+select * from t1 where id=2;
+Table 'test.t1' doesn't exist

mysql-test/t/query_cache.test

@@ -383,3 +383,17 @@ disable_result_log;
 select * from mysql.db;
 enable_result_log;
 show status like "Qcache_queries_in_cache";
+
+
+#
+# simple rename test
+#
+create table t1(id int auto_increment primary key);
+insert into t1 values (NULL), (NULL), (NULL);
+select * from t1 where id=2;
+alter table t1 rename to t2;
+-- error 1146
+select * from t1 where id=2;
+drop table t2;
+-- error 1146
+select * from t1 where id=2;

sql/sql_table.cc

@@ -1432,6 +1432,8 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
       }
       send_ok(&thd->net);
     }
+    table_list->table=0;				// For query cache
+    query_cache_invalidate3(thd, table_list, 0);
     DBUG_RETURN(error);
   }