From c74959c9e072971f0fdd90fcd242458ec8346879 Mon Sep 17 00:00:00 2001
From: "tsmith@ramayana.hindu.god" <>
Date: Wed, 30 Jan 2008 19:00:20 -0700
Subject: [PATCH] Bug #32149  Long semaphore wait for adaptive hash latch

Fix by calling ha_release_temporary_latches() before ::filesort().
---
 sql/filesort.cc | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/sql/filesort.cc b/sql/filesort.cc
index 43b079e83d5..132e91363f3 100644
--- a/sql/filesort.cc
+++ b/sql/filesort.cc
@@ -112,6 +112,13 @@ ha_rows filesort(THD *thd, TABLE *table, SORT_FIELD *sortorder, uint s_length,
   FILESORT_INFO table_sort;
   TABLE_LIST *tab= table->pos_in_table_list;
   Item_subselect *subselect= tab ? tab->containing_subselect() : 0;
+
+  /*
+   Release InnoDB's adaptive hash index latch (if holding) before
+   running a sort.
+  */
+  ha_release_temporary_latches(thd);
+
   /* 
     Don't use table->sort in filesort as it is also used by 
     QUICK_INDEX_MERGE_SELECT. Work with a copy and put it back at the end