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  1. MariaDB Server
  2. MDEV-40874

Difference in affected row count (and processing time) when using InnoDB vs Aria on UPDATE

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    Description

      Use the CLI to see the full oput:

      CREATE TABLE t (c DECIMAL(8,3)) ENGINE=InnoDB;  # Or ENGINE=Aria
      INSERT INTO t VALUES(NULL);
      UPDATE t SET c=DEFAULT;
      

      The last statement succeeds for both engines. However, with InnoDB we see "affected=0" whereas with Aria we see "affected=1" and a longer processing time (it is possible that with other testcases a data difference could be introduced):

      Leads to (using InnoDB):

      CS 13.1.0 da18481158c81ca94689702073c3e04aad85a6a3 (Optimized, Clang 22.1.8-20260622) Build 18/08/2026 [InnoDB]

      13.1.0-dbg>UPDATE t SET c=DEFAULT;
      Query OK, 0 rows affected (0.001 sec)
      Rows matched: 1  Changed: 0  Warnings: 0
      

      Leads to (using Aria):

      CS 13.1.0 da18481158c81ca94689702073c3e04aad85a6a3 (Optimized, Clang 22.1.8-20260622) Build 18/08/2026 [Aria]

      13.1.0-dbg>UPDATE t SET c=DEFAULT;
      Query OK, 1 row affected (0.020 sec)
      Rows matched: 1  Changed: 1  Warnings: 0
      

      Bug Detection Matrix

          Rel    o/d  Build   Commit                                    Diff observed
      ES  10.6   dbg  180826  fcecb2620f25965723d640decede7c018bcb1dcc  DIFF: AFFECTED ROWS
      ES  10.6   opt  180826  fcecb2620f25965723d640decede7c018bcb1dcc  DIFF: AFFECTED ROWS
      ES  11.4   dbg  180826  3b34189bfe675c18c4ced3ef531d016ea74c76f4  DIFF: AFFECTED ROWS
      ES  11.4   opt  180826  3b34189bfe675c18c4ced3ef531d016ea74c76f4  DIFF: AFFECTED ROWS
      ES  11.8   dbg  180826  4694e931d10fecf733c34f83ea2146d31b708eb3  DIFF: AFFECTED ROWS
      ES  11.8   opt  180826  4694e931d10fecf733c34f83ea2146d31b708eb3  DIFF: AFFECTED ROWS
      ES  12.3   dbg  180826  f513f503feacabfb219d4a6f965b5f72b86d4db0  DIFF: AFFECTED ROWS
      ES  12.3   opt  180826  f513f503feacabfb219d4a6f965b5f72b86d4db0  DIFF: AFFECTED ROWS
      CS  10.11  dbg  180826  8f00e6caca633c783140db86d3a48a96de67cf38  DIFF: AFFECTED ROWS
      CS  10.11  opt  180826  8f00e6caca633c783140db86d3a48a96de67cf38  DIFF: AFFECTED ROWS
      CS  11.4   dbg  180826  1a052f27e374fc9b4cb5b1fd098cf10f0e1381cc  DIFF: AFFECTED ROWS
      CS  11.4   opt  180826  1a052f27e374fc9b4cb5b1fd098cf10f0e1381cc  DIFF: AFFECTED ROWS
      CS  11.8   dbg  180826  d26f9ab217a7fcf9d4eccc62c01020ff275ff42e  DIFF: AFFECTED ROWS
      CS  11.8   opt  180826  d26f9ab217a7fcf9d4eccc62c01020ff275ff42e  DIFF: AFFECTED ROWS
      CS  12.3   dbg  180826  add63991988734383c5e942de2a19c6c45f511f7  DIFF: AFFECTED ROWS
      CS  12.3   opt  180826  add63991988734383c5e942de2a19c6c45f511f7  DIFF: AFFECTED ROWS
      CS  13.0   dbg  180826  a848493c6fe031f23606144420c1ca1e467cbd81  DIFF: AFFECTED ROWS
      CS  13.0   opt  180826  a848493c6fe031f23606144420c1ca1e467cbd81  DIFF: AFFECTED ROWS
      CS  13.1   dbg  180826  da18481158c81ca94689702073c3e04aad85a6a3  DIFF: AFFECTED ROWS
      CS  13.1   opt  180826  da18481158c81ca94689702073c3e04aad85a6a3  DIFF: AFFECTED ROWS
      

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            sanja Oleksandr Byelkin
            Roel Roel Van de Paar
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