bzr push into mysql-5.5 branch (nirbhay.choubey:3589 to 3590)

[Nirbhay Choubey]

 3590 Nirbhay Choubey	2011-10-24 [merge]
      Local merge from mysql-5.1.

    modified:
      cmd-line-utils/libedit/README
      cmd-line-utils/libedit/chared.c
 3589 Dmitry Lenev	2011-10-23
      Fix for bug #13116518 - "OPEN_TABLES() SHOULD NOT ALLOCATE AND FREE 
      NEW_FRM_MEM WITHOUT NEEDING TO".
      
      During the process of opening tables for a statement, we allocated
      memory which was used only during view loading even in cases when the
      statement didn't use any views. Such an unnecessary allocation (and
      corresponding freeing) might have caused significant performance
      overhead in some workloads. For example, it caused up to 15% slowdown
      in a simple stored routine calculating Fibonacci's numbers.
      
      This memory was pre-allocated as part of "new_frm_mem" MEM_ROOT
      initialization at the beginning of open_tables(). 
      
      This patch addresses this issue by turning off memory pre-allocation
      during initialization for this MEM_ROOT. Now, memory on this root
      will be allocated only at the point when the first .FRM for a view is 
      opened.
      
      The patch doesn't contain a test case since it is hard to test the
      performance improvements or the absence of memory allocation in our
      test framework.

    modified:
      sql/sql_base.cc
=== modified file 'cmd-line-utils/libedit/README'
--- a/cmd-line-utils/libedit/README	2011-10-13 19:33:25 +0000
+++ b/cmd-line-utils/libedit/README	2011-10-24 08:05:28 +0000
@@ -42,7 +42,7 @@ then merge remaining bits by hand.  All 
 marked with XXXMYSQL to make them easier to identify and merge.  To generate
 a 'clean' diff against upstream you can use the above commands but use
 
-	cvs co -D "2011/10/04 15:27:04" [..]
+	cvs co -D "2011/10/23 17:37:55" [..]
 
 to fetch the baseline of most recent merge.
 

=== modified file 'cmd-line-utils/libedit/chared.c'
--- a/cmd-line-utils/libedit/chared.c	2011-10-13 19:33:25 +0000
+++ b/cmd-line-utils/libedit/chared.c	2011-10-24 08:05:28 +0000
@@ -1,4 +1,4 @@
-/*	$NetBSD: chared.c,v 1.35 2011/08/16 16:25:15 christos Exp $	*/
+/*	$NetBSD: chared.c,v 1.36 2011/10/23 17:37:55 christos Exp $	*/
 
 /*-
  * Copyright (c) 1992, 1993
@@ -200,7 +200,7 @@ c_delbefore1(EditLine *el)
 protected int
 ce__isword(Int p)
 {
-	return Isalnum(p || Strchr(STR("*?_-.[]~="), p) != NULL);
+        return Isalnum(p) || Strchr(STR("*?_-.[]~="), p) != NULL;
 }
 
 

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