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  1. MariaDB Server
  2. MDEV-14755

Crash when executing prepared statement for a query that uses CTE

Details

    Description

      Execution of the prepared statement for the query 

      with cte as
      		 
      (select a from t1 where a between 4 and 7 group by a)
      		 
      (select a from cte where exists( select a from t1 where cte.a=t1.a )) 
      union
      		 
      (select a from t1 where a < 2);

      works fine while the execution this query that is equivalent to the first one

      with cte as
      		 
      (select a from t1 where a between 4 and 7 group by a)
      		 
      (select a from t1 where a < 2)
      		 
      union
      		 
      (select a from cte where exists( select a from t1 where cte.a=t1.a ));

      causes an assertion failure for debug builds and most probably crashes for release builds

      MariaDB [test]> create table t1 (a int);
      		 
       MariaDB [test]> insert into t1 values
      		 
          ->   (7), (2), (8), (1), (3), (2), (7), (5), (4), (7), (9), (8);
      		 
      MariaDB [test]> prepare stmt from "
      		 
      with cte as
      		 
      (select a from t1 where a between 4 and 7 group by a)
      		 
      (select a from cte where exists( select a from t1 where cte.a=t1.a )) 
      union
      		 
      (select a from t1 where a < 2); 
      ";
      		 
      Statement prepared
      		 
       MariaDB [test]> execute stmt;      
      +------+
      		 
      | a    |
      		 
      +------+
      		 
      |    7 |
      		 
      |    5 |
      		 
      |    4 |
      		 
      |    1 |
      		 
      +------+
      		 
      MariaDB [test]> execute stmt;
      		 
      +------+
      		 
      | a    |
      		 
      +------+
      		 
      |    7 |
      		 
      |    5 |
      		 
      |    4 |
      		 
      |    1 |
      		 
      +------+
      		 
      MariaDB [test]> prepare stmt from "
      		 
          "> with cte as
      		 
          "> (select a from t1 where a between 4 and 7 group by a)
      		 
          "> (select a from t1 where a < 2)
      		 
          "> union
      		 
          "> (select a from cte where exists( select a from t1 where cte.a=t1.a )) 
          "> ";
      		 
      Statement prepared
      		 
      MariaDB [test]> execute stmt;
      		 
       
      		 
      mysqld: /home/igor/maria-git/10.2/sql/sql_prepare.cc:2949: void reinit_stmt_before_use(THD*, LEX*): Assertion `sl->join == 0' failed.

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-14777 Crash in MariaDB 10.2.12 on query using VIEW and WITH RECURSIVE

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

          Activity

            Ascending order - Click to sort in descending order
            igor Igor Babaev (Inactive) added a comment -

            One can see the same failure after having replace cte for a mergeable one

            MariaDB [test]> prepare stmt from "
            		 
                "> with cte as
            		 
                "> (select a from t1 where a between 4 and 7)
            		 
                "> (select a from t1 where a < 2)
            		 
                "> union
            		 
                "> (select a from cte where exists( select a from t1 where cte.a=t1.a )); 
                "> ";
            		 
            Statement prepared
            		 
            MariaDB [test]> execute stmt;
            		 
            mysqld: /home/igor/maria-git/10.2/sql/sql_prepare.cc:2949: void reinit_stmt_before_use(THD*, LEX*): Assertion `sl->join == 0' failed.

            igor Igor Babaev (Inactive) added a comment - One can see the same failure after having replace cte for a mergeable one MariaDB [test]> prepare stmt from " "> with cte as "> (select a from t1 where a between 4 and 7) "> (select a from t1 where a < 2) "> union "> (select a from cte where exists( select a from t1 where cte.a=t1.a )); "> "; Statement prepared MariaDB [test]> execute stmt; mysqld: /home/igor/maria-git/10.2/sql/sql_prepare.cc:2949: void reinit_stmt_before_use(THD*, LEX*): Assertion `sl->join == 0' failed.
            sanja Oleksandr Byelkin added a comment -

            OK to push

            sanja Oleksandr Byelkin added a comment - OK to push
            igor Igor Babaev (Inactive) added a comment -

            A fix for this bug was pushed into the 10.2 tree.

            igor Igor Babaev (Inactive) added a comment - A fix for this bug was pushed into the 10.2 tree.

            People

              igor Igor Babaev (Inactive)
              igor Igor Babaev (Inactive)
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              Dates

                Created:
                Updated:
                Resolved:

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