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  1. MariaDB Server
  2. MDEV-35849

InnoDB: index records in a wrong order upon CHECK with DESC index

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      --source include/have_innodb.inc
       
      CREATE TABLE t (pk INT PRIMARY KEY, a VARCHAR(1), KEY (a DESC)) ENGINE=InnoDB;
      INSERT INTO t VALUES (1,NULL),(2,'x');
      CHECK TABLE t EXTENDED;
       
      DROP TABLE t;
      

      main 3761a7fec8a273c06d52f89bccf11e50cbe5a89d

      CHECK TABLE t EXTENDED;
      Table	Op	Msg_type	Msg_text
      test.t	check	Warning	InnoDB: The B-tree of index a is corrupted.
      test.t	check	error	Corrupt
      DROP TABLE t;
      bug.flag1a                               [ fail ]  Found warnings/errors in server log file!
              Test ended at 2025-01-14 22:10:02
      line
      2025-01-14 22:10:01 4 [ERROR] InnoDB: index records in a wrong order in `a` of table `test`.`t`: TUPLE (info_bits=0, 2 fields): {NULL,[4]    (0x80000001)}, COMPACT RECORD(info_bits=0, 2 fields): {[1]x(0x78),[4]    (0x80000002)}
      2025-01-14 22:10:01 4 [ERROR] InnoDB: Flagged corruption of `a` in table `test`.`t` in CHECK TABLE-check index
      

      The failure started happening after this commit in main:

      commit 3761a7fec8a273c06d52f89bccf11e50cbe5a89d (HEAD, origin/main, origin/HEAD, main)
      Author: Marko Mäkelä
      Date:   Fri Jan 10 16:40:55 2025 +0200
       
          MDEV-35312 page_cur_search_with_match() could avoid rec_get_offsets()
      

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              marko Marko Mäkelä
              elenst Elena Stepanova
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                Resolved:

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