Merge with 4.1

Makefile.am:
  Auto merged
myisam/mi_create.c:
  Auto merged
myisam/mi_open.c:
  Auto merged
mysql-test/r/ctype_utf8.result:
  Auto merged
mysys/thr_alarm.c:
  Auto merged
VC++Files/sql/mysqld.dsp:
  Keep old
client/mysqldump.c:
  Manual merge
client/mysqltest.c:
  Automatic merge
configure.in:
  Manual merge
mysql-test/r/ctype_ucs.result:
  Auto merge
mysql-test/r/func_str.result:
  Auto merge
mysql-test/r/group_by.result:
  Auto merge
mysql-test/r/insert_select.result:
  Auto merge
mysql-test/r/insert_update.result:
  Auto merge
mysql-test/r/lowercase_table2.result:
  Auto merge
mysql-test/r/select.result:
  Manual merge
mysql-test/r/variables.result:
  Auto merge
mysql-test/t/ctype_ucs.test:
  Auto merge
mysql-test/t/func_str.test:
  Auto merge
mysql-test/t/group_by.test:
  Auto merge
mysql-test/t/insert_select.test:
  Auto merge
mysql-test/t/insert_update.test:
  Auto merge
mysql-test/t/ndb_alter_table.test:
  Auto merge
mysql-test/t/select.test:
  Auto merge
mysql-test/t/variables.test:
  Auto merge
mysys/my_access.c:
  Auto merge
scripts/make_win_src_distribution.sh:
  Auto merge
sql/field.cc:
  Manual merge
sql/ha_ndbcluster.cc:
  Auto merge
sql/handler.cc:
  Auto merge
sql/item.cc:
  Auto merge
sql/item.h:
  Manual merge
sql/item_cmpfunc.h:
  Auto merge
sql/item_strfunc.cc:
  Auto merge
sql/item_strfunc.h:
  Auto merge
sql/mysql_priv.h:
  manual merge
sql/mysqld.cc:
  manual merge
sql/opt_range.cc:
  manual merge
sql/set_var.cc:
  Auto merge
sql/sql_base.cc:
  manual merge
  Restore processing of ON DUPLICATE KEY UPDATE
sql/sql_insert.cc:
  manual merge
  Restore processing of ON DUPLICATE KEY UPDATE
  Simplify mysql_prepare_insert by using local variable for select_lex and save old values just before they are changed
sql/sql_parse.cc:
  Restore processing of ON DUPLICATE KEY UPDATE
sql/sql_prepare.cc:
  New ON DUPLICATE KEY UPDATE handling
sql/sql_select.cc:
  manual merge
sql/sql_table.cc:
  auto merge
sql/sql_yacc.yy:
  auto merge
strings/ctype-ucs2.c:
  auto merge
strings/ctype-utf8.c:
  auto merge

mysql-test/r/func_str.result

@@ -811,3 +811,53 @@ SELECT * FROM t1, t2 WHERE num=substring(str from 1 for 6);
 str	num
 notnumber	0
 DROP TABLE t1,t2;
+CREATE TABLE t1(
+id int(11) NOT NULL auto_increment,
+pc int(11) NOT NULL default '0',
+title varchar(20) default NULL,
+PRIMARY KEY (id)
+);
+INSERT INTO t1 VALUES
+(1, 0, 'Main'),
+(2, 1, 'Toys'),
+(3, 1, 'Games');
+SELECT t1.id, CONCAT_WS('->', t3.title, t2.title, t1.title) as col1
+FROM t1 LEFT JOIN t1 AS t2 ON t1.pc=t2.id
+LEFT JOIN t1 AS t3 ON t2.pc=t3.id;
+id	col1
+1	Main
+2	Main->Toys
+3	Main->Games
+SELECT t1.id, CONCAT_WS('->', t3.title, t2.title, t1.title) as col1
+FROM t1 LEFT JOIN t1 AS t2 ON t1.pc=t2.id
+LEFT JOIN t1 AS t3 ON t2.pc=t3.id
+WHERE CONCAT_WS('->', t3.title, t2.title, t1.title) LIKE '%Toys%';
+id	col1
+2	Main->Toys
+DROP TABLE t1;
+CREATE TABLE t1(
+trackid     int(10) unsigned NOT NULL auto_increment,
+trackname   varchar(100) NOT NULL default '',
+PRIMARY KEY (trackid)
+);
+CREATE TABLE t2(
+artistid    int(10) unsigned NOT NULL auto_increment,
+artistname  varchar(100) NOT NULL default '',
+PRIMARY KEY (artistid)
+);
+CREATE TABLE t3(
+trackid     int(10) unsigned NOT NULL,
+artistid    int(10) unsigned NOT NULL,
+PRIMARY KEY (trackid,artistid)
+);
+INSERT INTO t1 VALUES (1, 'April In Paris'), (2, 'Autumn In New York');
+INSERT INTO t2 VALUES (1, 'Vernon Duke');
+INSERT INTO t3 VALUES (1,1);
+SELECT CONCAT_WS(' ', trackname, artistname) trackname, artistname
+FROM t1 LEFT JOIN t3 ON t1.trackid=t3.trackid
+LEFT JOIN t2 ON t2.artistid=t3.artistid
+WHERE CONCAT_WS(' ', trackname, artistname) LIKE '%In%';
+trackname	artistname
+April In Paris Vernon Duke	Vernon Duke
+Autumn In New York	NULL
+DROP TABLE t1,t2,t3;