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  1. MariaDB Server
  2. MDEV-26108

Crash with query referencing twice CTE that uses embedded recursive CTE

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    Description

      Processing of a query containing at least two references to the same CTE that uses an embedded recursive CTE causes a crash of the server in 10.4+.
      Here's a simple test case that demonstrates this problem.

      create table t1 (a int); 
      insert into t1 values (5), (7);
      		 
      with cte_e as (
      		 
        with recursive cte_r as (
      		 
          select a from t1 union select a+1 as a from cte_r r where a < 10
      		 
        ) select * from cte_r
      		 
      ) select * from cte_e s1, cte_e s2 where s1.a=s2.a;

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-25103 Crash at JOIN::reinit - calling stored procedure

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-26025 Server crashes while executing query with CTE in PS/SP

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

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              igor Igor Babaev (Inactive)
              igor Igor Babaev (Inactive)
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                Resolved:

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