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  1. MariaDB Server
  2. MDEV-27434

DESC attribute does not work with auto-increment on secondary column of multi-part index

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    Details

    • Type: Bug
    • Status: Closed (View Workflow)
    • Priority: Critical
    • Resolution: Fixed
    • Affects Version/s: N/A
    • Fix Version/s: 10.8.1
    • Component/s: Server
    • Labels:
      None

      Description

      CREATE TABLE t (a INT AUTO_INCREMENT, b INT, UNIQUE(b,a DESC)) ENGINE=MyISAM;
      INSERT IGNORE INTO t (b) VALUES (10),(10),(10);
       
      SELECT * FROM t;
       
      # Cleanup
      DROP TABLE t;
      

      preview-10.8-MDEV-13756-desc-indexes 43444ff5

      INSERT IGNORE INTO t (b) VALUES (10),(10),(10);
      Warnings:
      Warning	1062	Duplicate entry '10-2' for key 'b'
      SELECT * FROM t;
      a	b
      2	10
      1	10
      

      Without the DESC attribute, the value of `a` would continue to be auto-incremented, no warnings/errors would occur upon INSERT, and there would be 3 values in the table at the end:

      Expected result (apart from sorting in SELECT)

      INSERT IGNORE INTO t (b) VALUES (10),(10),(10);
      SELECT * FROM t;
      a	b
      1	10
      2	10
      3	10
      

      Also reproducible with Aria.

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              Assignee:
              serg Sergei Golubchik
              Reporter:
              elenst Elena Stepanova
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                Dates

                Created:
                Updated:
                Resolved:

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