WL #528: Faster free_tmp_table

include/heap.h

@@ -206,6 +206,7 @@ extern int heap_create(const char *name, uint keys, HP_KEYDEF *keydef,
 		       uint reclength, ulong max_records, ulong min_records,
 		       HP_CREATE_INFO *create_info);
 extern int heap_delete_table(const char *name);
+extern void heap_drop_table(HP_INFO *info);
 extern int heap_extra(HP_INFO *info,enum ha_extra_function function);
 extern int heap_rename(const char *old_name,const char *new_name);
 extern int heap_panic(enum ha_panic_function flag);

sql/ha_heap.cc

@@ -477,6 +477,14 @@ int ha_heap::delete_table(const char *name)
   return error == ENOENT ? 0 : error;
 }
 
+
+void ha_heap::drop_table(const char *name)
+{
+  heap_drop_table(file);
+  close();
+}
+
+
 int ha_heap::rename_table(const char * from, const char * to)
 {
   return heap_rename(from,to);

sql/ha_heap.h

@@ -94,6 +94,7 @@ public:
   int indexes_are_disabled(void);
   ha_rows records_in_range(uint inx, key_range *min_key, key_range *max_key);
   int delete_table(const char *from);
+  void drop_table(const char *name);
   int rename_table(const char * from, const char * to);
   int create(const char *name, TABLE *form, HA_CREATE_INFO *create_info);
   void update_create_info(HA_CREATE_INFO *create_info);

sql/handler.cc

@@ -2062,6 +2062,14 @@ int handler::rename_table(const char * from, const char * to)
   return error;
 }
 
+
+void handler::drop_table(const char *name)
+{
+  close();
+  delete_table(name);
+}
+
+
 /*
   Tell the storage engine that it is allowed to "disable transaction" in the
   handler. It is a hint that ACID is not required - it is used in NDB for

sql/handler.h

@@ -1288,6 +1288,7 @@ public:
   */
   virtual int rename_table(const char *from, const char *to);
   virtual int delete_table(const char *name);
+  virtual void drop_table(const char *name);
   
   virtual int create(const char *name, TABLE *form, HA_CREATE_INFO *info)=0;
   virtual int create_handler_files(const char *name) { return FALSE;}

sql/sql_select.cc

@@ -8848,16 +8848,8 @@ free_tmp_table(THD *thd, TABLE *entry)
   if (entry->file)
   {
     if (entry->db_stat)
-    {
-      (void) entry->file->close();
-    }
-    /*
-      We can't call ha_delete_table here as the table may created in mixed case
-      here and we have to ensure that delete_table gets the table name in
-      the original case.
-    */
-    if (!(test_flags & TEST_KEEP_TMP_TABLES) ||
-        entry->s->db_type == DB_TYPE_HEAP)
+      entry->file->drop_table(entry->s->table_name);
+    else
       entry->file->delete_table(entry->s->table_name);
     delete entry->file;
   }

storage/heap/hp_create.c

@@ -234,6 +234,16 @@ static void init_block(HP_BLOCK *block, uint reclength, ulong min_records,
        HP_PTRS_IN_NOD * block->level_info[i - 1].records_under_level);
 }
 
+
+static inline void heap_try_free(HP_SHARE *share)
+{
+  if (share->open_count == 0)
+    hp_free(share);
+  else
+    share->delete_on_close= 1;
+}
+
+
 int heap_delete_table(const char *name)
 {
   int result;
@@ -243,10 +253,7 @@ int heap_delete_table(const char *name)
   pthread_mutex_lock(&THR_LOCK_heap);
   if ((share= hp_find_named_heap(name)))
   {
-    if (share->open_count == 0)
-      hp_free(share);
-    else
-     share->delete_on_close= 1;
+    heap_try_free(share);
     result= 0;
   }
   else
@@ -257,6 +264,17 @@ int heap_delete_table(const char *name)
   DBUG_RETURN(result);
 }
 
+
+void heap_drop_table(HP_INFO *info)
+{
+  DBUG_ENTER("heap_drop_table");
+  pthread_mutex_lock(&THR_LOCK_heap);
+  heap_try_free(info->s);
+  pthread_mutex_unlock(&THR_LOCK_heap);
+  DBUG_VOID_RETURN;
+}
+
+
 void hp_free(HP_SHARE *share)
 {
   heap_share_list= list_delete(heap_share_list, &share->open_list);