BUG#18160 - Memory-/HEAP Table endless growing indexes

Updating data in HEAP table with BTREE index results in wrong index_length
counter value, which keeps growing after each update.

When inserting new record into tree counter is incremented by:
sizeof(TREE_ELEMENT) + key_size + tree->size_of_element
But when deleting element from tree it doesn't decrement counter by key_size:
sizeof(TREE_ELEMENT) + tree->size_of_element

This fix makes accurate allocated memory counter for tree. That is
decrease counter by key_size when deleting tree element.


heap/hp_delete.c:
  Added size of the key to tree_delete() for accurate allocated memory counter.
include/my_tree.h:
  Added size of the key to tree_delete() for accurate allocated memory counter.
myisam/myisamlog.c:
  Added size of the key to tree_delete() for accurate allocated memory counter.
mysql-test/r/heap_btree.result:
  Testcase for BUG#18160.
mysql-test/t/heap_btree.test:
  Testcase for BUG#18160.
mysys/tree.c:
  Added size of the key to tree_delete() for accurate allocated memory counter.
  Note that this size is optional. If one doesn't need precise counter it is safe
  to pass 0 as key_size.

1 files changed, 1 insertions, 1 deletions

diff --git a/include/my_tree.h b/include/my_tree.h
index 14d8593b6dc..03dc9d5c829 100644
--- a/include/my_tree.h
+++ b/include/my_tree.h
@@ -84,7 +84,7 @@ TREE_ELEMENT *tree_insert(TREE *tree,void *key, uint key_size,
 void *tree_search(TREE *tree, void *key, void *custom_arg);
 int tree_walk(TREE *tree,tree_walk_action action,
 	      void *argument, TREE_WALK visit);
-int tree_delete(TREE *tree, void *key, void *custom_arg);
+int tree_delete(TREE *tree, void *key, uint key_size, void *custom_arg);
 void *tree_search_key(TREE *tree, const void *key, 
                       TREE_ELEMENT **parents, TREE_ELEMENT ***last_pos,
                       enum ha_rkey_function flag, void *custom_arg);