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  1. MariaDB Server
  2. MDEV-30774

RPAD result varies on row order

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    Description

      RPAD result incorrect on following first example. Desired result on the second run wher result order different.

      Server version: 11.0.1-MariaDB-1:11.0.1+maria~ubu2204 mariadb.org binary distribution
       
      MariaDB [beta]> select rpad('zzz',length(a),'*'),a
          ->   from (
          ->   select 'a' a union select 'bb' union select 'cccc'
          -> ) as a
          -> order by a
          -> ;
      +---------------------------+------+
      | rpad('zzz',length(a),'*') | a    |
      +---------------------------+------+
      | z                         | a    |
      | z*                        | bb   |
      | z***                      | cccc |
      +---------------------------+------+
      3 rows in set (0.001 sec)
       
      MariaDB [beta]> select rpad('zzz',length(a),'*'),a
          ->   from (
          ->   select 'a' a union select 'bb' union select 'cccc'
      ;    -> ) as a
          -> order by a desc
          -> ;
      +---------------------------+------+
      | rpad('zzz',length(a),'*') | a    |
      +---------------------------+------+
      | zzz*                      | cccc |
      | zz                        | bb   |
      | z                         | a    |
      +---------------------------+------+
      3 rows in set (0.001 sec)

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              serg Sergei Golubchik
              rafu Timo Raitalaakso
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                Updated:
                Resolved:

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