fix memory calculate for spider_mon_table_cache

storage/spider/spd_ping_table.cc

@@ -850,6 +850,7 @@ int spider_init_ping_table_mon_cache(
   bool need_lock
 ) {
   int error_num, same;
+  uint old_elements;
   TABLE *table_link_mon = NULL;
 #if MYSQL_VERSION_ID < 50500
   Open_tables_state open_tables_backup;
@@ -899,11 +900,23 @@ int spider_init_ping_table_mon_cache(
         {
           mon_key.sort = spider_calc_for_sort(3, mon_key.db_name,
             mon_key.table_name, mon_key.link_id);
+          old_elements = spider_mon_table_cache.max_element;
           if (push_dynamic(&spider_mon_table_cache, (uchar *) &mon_key))
           {
             error_num = HA_ERR_OUT_OF_MEM;
             goto error_push_dynamic;
           }
+          if (spider_mon_table_cache.max_element != old_elements)
+          {
+            spider_free_mem_calc(spider_current_trx,
+              spider_mon_table_cache_id,
+              old_elements *
+              spider_mon_table_cache.size_of_element);
+            spider_alloc_calc_mem(spider_current_trx,
+              spider_mon_table_cache,
+              spider_mon_table_cache.max_element *
+              spider_mon_table_cache.size_of_element);
+          }
         }
 
         if ((error_num = spider_sys_index_next(table_link_mon)))
@@ -923,12 +936,16 @@ int spider_init_ping_table_mon_cache(
       (uchar *) dynamic_element(&spider_mon_table_cache, 0, SPIDER_MON_KEY *),
       spider_mon_table_cache.elements, sizeof(SPIDER_MON_KEY),
       (qsort_cmp) spider_compare_for_sort);
-    uint old_elements = spider_mon_table_cache.max_element;
+    old_elements = spider_mon_table_cache.max_element;
     freeze_size(&spider_mon_table_cache);
-    if (spider_mon_table_cache.max_element < old_elements)
+    if (spider_mon_table_cache.max_element != old_elements)
     {
       spider_free_mem_calc(spider_current_trx,
         spider_mon_table_cache_id,
+        old_elements *
+        spider_mon_table_cache.size_of_element);
+      spider_alloc_calc_mem(spider_current_trx,
+        spider_mon_table_cache,
         spider_mon_table_cache.max_element *
         spider_mon_table_cache.size_of_element);
     }