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  1. MariaDB Server
  2. MDEV-23886

Reusing CTE inside a function fails with table doesn't exist

Details

    Description

      When I try to use a single CTE multiple times inside a stored function, the function fails with
      ERROR 1146 (42S02): Table 'test.testtab' doesn't exist

      DROP TABLE IF EXISTS testtab;
      		 
      CREATE TABLE testtab (c1 int(11) );
      		 
      INSERT INTO testtab VALUES (1),(2),(6);
      		 
       
      DROP FUNCTION IF EXISTS TESTFUN;
      		 
      DELIMITER |
      		 
      CREATE FUNCTION TESTFUN() RETURNS INT DETERMINISTIC BEGIN
      		 
      RETURN (
      		 
          WITH
      		 
              cte1 as (select c1 from testtab)
      		 
      -- here
      		 
          SELECT SUM(c1) FROM ( SELECT * FROM cte1 UNION ALL SELECT * FROM cte1 ) as u1
      		 
      );
      		 
      END|
      		 
      DELIMITER ;
      		 
      SELECT TESTFUN();

      Returns -> ERROR 1146 (42S02): Table 'test.testtab' doesn't exist
      Expected -> 18

      Running the same query without wrapping it in a function works fine:

          WITH
      		 
              cte1 as (select c1 from testtab)
      		 
      -- here
      		 
          SELECT SUM(c1) FROM ( SELECT * FROM cte1 UNION ALL SELECT * FROM cte1 ) as u1;

      Returns -> 18

      The same error occurs when:

      • CTE is self-joined in a query - inside a stored function
      • multiple branches of a CASE ... END use it in tests: WHEN EXISTS (SELECT NULL FROM CTE WHERE X=Y) THEN "result 1" WHEN EXISTS ( SELECT NULL FROM CTE ) THEN "result 2" END - inside a stored function

      Attachments

        Issue Links

          blocks

          Bug - A problem which impairs or prevents the functions of the product. MDEV-24488 Cannot use CTE in trigger definition

          • Major - Major loss of function.
          • Confirmed
          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. MDEV-25464 Joining CTEs inside a function fails with error code 1146 despite the tables existing

          • Major - Major loss of function.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-24019 Assertion is hit for query using recursive CTE with no default DB

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-25601 MariaDB 10.5 crash when execute query with SET

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

          Bug - A problem which impairs or prevents the functions of the product. MDEV-26202 Unexpected failure with query using indirectly a recursive CTE twice

          • Major - Major loss of function.
          • Closed

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              igor Igor Babaev (Inactive)
              szatox Szatox
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              Dates

                Created:
                Updated:
                Resolved:

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