Merge from mysql-5.1-innodb:

  ------------------------------------------------------------
  revno: 3459
  revision-id: marko.makela@oracle.com-20100511105308-grp2t3prh3tqivw0
  parent: marko.makela@oracle.com-20100511105012-b2t7wvz6mu6bll74
  parent: marko.makela@oracle.com-20100505123901-xjxu93h1xnbkfkq0
  committer: Marko Mäkelä <marko.makela@oracle.com>
  branch nick: mysql-5.1-innodb
  timestamp: Tue 2010-05-11 13:53:08 +0300
  message:
    Merge a patch from Facebook to fix Bug #53290

    commit e759bc64eb5c5eed4f75677ad67246797d486460
    Author: Ryan Mack
    Date:   3 days ago

        Bugfix for 53290, fast unique index creation fails on duplicate null values

        Summary:
        Bug in the fast index creation code incorrectly considers null
        values to be duplicates during block merging.  Innodb policy is that
        multiple null values are allowed in a unique index.  Null duplicates
        were correctly ignored while sorting individual blocks and with slow
        index creation.

        Test Plan:
        mtr, including new test, load dbs using deferred index creation

        License:
        Copyright (C) 2009-2010 Facebook, Inc.  All Rights Reserved.

        Dual licensed under BSD license and GPLv2.

        Redistribution and use in source and binary forms, with or without
        modification, are permitted provided that the following conditions are met:
        1. Redistributions of source code must retain the above copyright notice,
           this list of conditions and the following disclaimer.
        2. Redistributions in binary form must reproduce the above copyright notice,
           this list of conditions and the following disclaimer in the documentation
           and/or other materials provided with the distribution.

        THIS SOFTWARE IS PROVIDED BY FACEBOOK, INC. ``AS IS'' AND ANY EXPRESS OR
        IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
        MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
        EVENT SHALL FACEBOOK, INC. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
        SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
        PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
        OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
        WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
        OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
        ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

        This program is free software; you can redistribute it and/or modify it
        under the terms of the GNU General Public License as published by the Free
        Software Foundation; version 2 of the License.

        This program is distributed in the hope that it will be useful, but WITHOUT
        ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
        FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
        more details.

        You should have received a copy of the GNU General Public License along with
        this program; if not, write to the Free Software Foundation, Inc., 59 Temple
        Place, Suite 330, Boston, MA  02111-1307  USA
      ------------------------------------------------------------
      revno: 3453.2.1
      revision-id: marko.makela@oracle.com-20100505123901-xjxu93h1xnbkfkq0
      parent: marko.makela@oracle.com-20100505120555-ukoq1gklpheslrxs
      committer: Marko Mäkelä <marko.makela@oracle.com>
      branch nick: 5.1-innodb
      timestamp: Wed 2010-05-05 15:39:01 +0300
      message:
        Merge a contribution from Ryan Mack at Facebook:

        Bugfix for 53290, fast unique index creation fails on duplicate null values

            Summary:
            Bug in the fast index creation code incorrectly considers null
            values to be duplicates during block merging.  Innodb policy is that
            multiple null values are allowed in a unique index.  Null duplicates
            were correctly ignored while sorting individual blocks and with slow
            index creation.

            Test Plan:
            mtr, including new test, load dbs using deferred index creation

            DiffCamp Revision: 110840
            Reviewed By: mcallaghan
            CC: mcallaghan, mysql-devel@lists
            Revert Plan:
            OK

1 files changed, 17 insertions, 0 deletions

diff --git a/mysql-test/suite/innodb/r/innodb_bug53290.result b/mysql-test/suite/innodb/r/innodb_bug53290.result
new file mode 100644
index 00000000000..46cd7248c4e
--- /dev/null
+++ b/mysql-test/suite/innodb/r/innodb_bug53290.result
@@ -0,0 +1,17 @@
+create table bug53290 (x bigint) engine=innodb;
+insert into bug53290 () values (),(),(),(),(),(),(),(),(),(),(),();
+insert into bug53290 select * from bug53290;
+insert into bug53290 select * from bug53290;
+insert into bug53290 select * from bug53290;
+insert into bug53290 select * from bug53290;
+insert into bug53290 select * from bug53290;
+insert into bug53290 select * from bug53290;
+insert into bug53290 select * from bug53290;
+insert into bug53290 select * from bug53290;
+insert into bug53290 select * from bug53290;
+insert into bug53290 select * from bug53290;
+insert into bug53290 select * from bug53290;
+insert into bug53290 select * from bug53290;
+insert into bug53290 select * from bug53290;
+alter table bug53290 add unique index `idx` (x);
+drop table bug53290;