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  1. MariaDB Server
  2. MDEV-32913

Crash when query uses recursive reference to CTE in ORDER BY clause

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Details

    • Bug
    • Status: Stalled (View Workflow)
    • Critical
    • Resolution: Unresolved
    • 10.5, 10.4(EOL)
    • 10.4(EOL)
    • Optimizer - CTE
    • None

    Description

      The following query leads to an assertion abort:

      WITH RECURSIVE x (a) AS
       ( 
         SELECT 1
         UNION 
         SELECT (SELECT 1 AS a UNION SELECT 1 ORDER BY (SELECT 1 FROM x) ) FROM x
       )
       SELECT a FROM x;
      

      In 10.4 the abort happens in handler::ha_rnd_next():

      int handler::ha_rnd_next(uchar*): Assertion `inited == RND' failed.
      

      in 10.5 the abort happens in handler::start_psi_batch_mode().

      The above test case is a simplification of the test case for MDEV-29070.

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              sanja Oleksandr Byelkin
              igor Igor Babaev
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              Dates

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                Updated:

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