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Merge Revision revid:marko.makela@oracle.com-20100601140355-u3kxl0yl0ljl5tx9 from MySQL InnoDB

Original revid:marko.makela@oracle.com-20100601140355-u3kxl0yl0ljl5tx9

Original Authors: Marko Mäkelä <marko.makela@oracle.com>
Original commit message:
Merge a change from mysql-5.1-innodb:

  ------------------------------------------------------------
  revno: 3491
  revision-id: marko.makela@oracle.com-20100601134335-ccthwwru23kn09qw
  parent: marko.makela@oracle.com-20100601120751-1uq7bbta5n7ts0qr
  committer: Marko Mäkelä <marko.makela@oracle.com>
  branch nick: 5.1-innodb
  timestamp: Tue 2010-06-01 16:43:35 +0300
  message:
    Bug#48197: Concurrent rw_lock_free may cause assertion failure

    rw_lock_t: Remove magic_n unless UNIV_DEBUG is defined.
    rw_lock_free(): Invalidate magic_n only after removing from rw_lock_list.

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tests/t/distinct.test
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INSERT INTO t1 VALUES (1,1), (2,1), (3,1);
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EXPLAIN SELECT DISTINCT a FROM t1;
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EXPLAIN SELECT DISTINCT a,b FROM t1;
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--error ER_CARTESIAN_JOIN_ATTEMPTED
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EXPLAIN SELECT DISTINCT t1_1.a, t1_1.b FROM t1 t1_1, t1 t1_2;
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--sorted_result
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EXPLAIN SELECT DISTINCT t1_1.a, t1_1.b FROM t1 t1_1, t1 t1_2