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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
    • 10.4, 10.5
    • 10.4
    • 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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          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-32697 Assertion `m_psi_batch_mode == PSI_BATCH_MODE_NONE' failed in handler::start_psi_batch_mode and Assertion `inited == RND' failed in handler::ha_rnd_next upon WITH RECURSIVE

          • Major - Major loss of function.
          • Stalled

          Activity

            People

              sanja Oleksandr Byelkin
              igor Igor Babaev
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              Dates

                Created:
                Updated:

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