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  1. MariaDB Server
  2. MDEV-25357

AUTO_INCREMENT on secondary column can result in duplicate keys when using Aria storage engine

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      CREATE TABLE `test` (
        `name` varchar(32) NOT NULL,
        `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
        PRIMARY KEY (`name`,`id`)
      ) ENGINE=Aria
      

      Start two or more connections running

      INSERT INTO test (name) VALUES ('foo')
      

      This will eventually result in a duplicate entry error (1062).
      (within a couple of hundred rows in my test setup with three connections)

      This does not happen when using the MyISAM storage engine.

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            holyfoot Alexey Botchkov
            tgm Martijn
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