fixed BUG in query cahe statistic counting

mysql-test/r/grant_cache.result:
  right results in query cache
mysql-test/t/grant_cache.test:
  proving new results
sql/sql_cache.cc:
  fixed statistic calculating in query cahe

mysql-test/r/grant_cache.result

@@ -41,17 +41,53 @@ grant SELECT on mysqltest.* to mysqltest_1@localhost;
 grant SELECT on mysqltest.t1 to mysqltest_2@localhost;
 grant SELECT on test.t1 to mysqltest_2@localhost;
 grant SELECT(a) on mysqltest.t1 to mysqltest_3@localhost;
+show status like "Qcache_queries_in_cache";
+Variable_name	Value
+Qcache_queries_in_cache	6
+show status like "Qcache_hits";
+Variable_name	Value
+Qcache_hits	0
+show status like "Qcache_not_cached";
+Variable_name	Value
+Qcache_not_cached	0
 select "user1";
 user1
 user1
+show status like "Qcache_queries_in_cache";
+Variable_name	Value
+Qcache_queries_in_cache	6
+show status like "Qcache_hits";
+Variable_name	Value
+Qcache_hits	0
+show status like "Qcache_not_cached";
+Variable_name	Value
+Qcache_not_cached	1
 select * from t1;
 a	b	c
 1	1	1
 2	2	2
+show status like "Qcache_queries_in_cache";
+Variable_name	Value
+Qcache_queries_in_cache	6
+show status like "Qcache_hits";
+Variable_name	Value
+Qcache_hits	1
+show status like "Qcache_not_cached";
+Variable_name	Value
+Qcache_not_cached	1
 select a from t1 ;
 a
 1
 2
+show status like "Qcache_queries_in_cache";
+Variable_name	Value
+Qcache_queries_in_cache	6
+show status like "Qcache_hits";
+Variable_name	Value
+Qcache_hits	2
+show status like "Qcache_not_cached";
+Variable_name	Value
+Qcache_not_cached	1
 select c from t1;
 c
 1
@@ -94,7 +130,7 @@ Variable_name	Value
 Qcache_hits	7
 show status like "Qcache_not_cached";
 Variable_name	Value
-Qcache_not_cached	3
+Qcache_not_cached	2
 select "user3";
 user3
 user3
@@ -118,7 +154,7 @@ Variable_name	Value
 Qcache_hits	7
 show status like "Qcache_not_cached";
 Variable_name	Value
-Qcache_not_cached	8
+Qcache_not_cached	7
 select "user4";
 user4
 user4
@@ -144,7 +180,7 @@ Variable_name	Value
 Qcache_hits	8
 show status like "Qcache_not_cached";
 Variable_name	Value
-Qcache_not_cached	9
+Qcache_not_cached	8
 delete from mysql.user where user in ("mysqltest_1","mysqltest_2","mysqltest_3");
 delete from mysql.db where user in ("mysqltest_1","mysqltest_2","mysqltest_3");
 delete from mysql.tables_priv where user in ("mysqltest_1","mysqltest_2","mysqltest_3");

mysql-test/t/grant_cache.test

@@ -40,10 +40,22 @@ grant SELECT(a) on mysqltest.t1 to mysqltest_3@localhost;
 # The following queries should be fetched from cache
 connect (user1,localhost,mysqltest_1,,mysqltest,$MASTER_MYPORT,master.sock);
 connection user1;
+show status like "Qcache_queries_in_cache";
+show status like "Qcache_hits";
+show status like "Qcache_not_cached";
 select "user1";
+show status like "Qcache_queries_in_cache";
+show status like "Qcache_hits";
+show status like "Qcache_not_cached";
 select * from t1;
+show status like "Qcache_queries_in_cache";
+show status like "Qcache_hits";
+show status like "Qcache_not_cached";
 # The pre and end space are intentional
  select a from t1 ;
+show status like "Qcache_queries_in_cache";
+show status like "Qcache_hits";
+show status like "Qcache_not_cached";
 select c from t1;
 show status like "Qcache_queries_in_cache";
 show status like "Qcache_hits";

sql/sql_cache.cc

@@ -589,7 +589,6 @@ void query_cache_insert(NET *net, const char *packet, ulong length)
     if (!query_cache.append_result_data(&result, length, (gptr) packet,
 					query_block))
     {
-      query_cache.refused++;
       DBUG_PRINT("warning", ("Can't append data"));
       header->result(result);
       DBUG_PRINT("qcache", ("free query 0x%lx", (ulong) query_block));
@@ -845,7 +844,8 @@ void Query_cache::store_query(THD *thd, TABLE_LIST *tables_used)
     }
   }
   else
-    statistic_increment(refused, &structure_guard_mutex);
+    if (thd->lex.sql_command == SQLCOM_SELECT)
+      statistic_increment(refused, &structure_guard_mutex);
 
 end:
   DBUG_VOID_RETURN;
@@ -981,7 +981,6 @@ Query_cache::send_result_to_client(THD *thd, char *sql, uint query_length)
       DBUG_PRINT("qcache",
 		 ("probably no SELECT access to %s.%s =>  return to normal processing",
 		  table_list.db, table_list.alias));
-      refused++;				// This is actually a hit
       STRUCT_UNLOCK(&structure_guard_mutex);
       thd->safe_to_cache_query=0;		// Don't try to cache this
       BLOCK_UNLOCK_RD(query_block);
@@ -1610,6 +1609,12 @@ void Query_cache::free_query(Query_cache_block *query_block)
   */
   if (result_block != 0)
   {
+    if (result_block->type != Query_cache_block::RESULT)
+    {
+      // removing unfinished query
+      refused++;
+      inserts--;
+    }
     Query_cache_block *block = result_block;
     do
     {
@@ -1618,6 +1623,12 @@ void Query_cache::free_query(Query_cache_block *query_block)
       free_memory_block(current);
     } while (block != result_block);
   }
+  else
+  {
+    // removing unfinished query
+    refused++;
+    inserts--;
+  }
 
   query->unlock_n_destroy();
   free_memory_block(query_block);