[MDEV-16629] "Table Does Not Exist" Error from Recursive CTE Query Inside Function Created: 2018-06-30  Updated: 2021-04-20  Resolved: 2018-07-21

Status: Closed
Project: MariaDB Server
Component/s: Optimizer - CTE, Storage Engine - InnoDB, Stored routines
Affects Version/s: 10.3.7
Fix Version/s: 10.2.17

Type: Bug Priority: Major
Reporter: Fred Hornsey Assignee: Igor Babaev
Resolution: Fixed Votes: 1
Labels: cte, function, query
Environment:

Ubuntu 18.04 x86_64, MariaDB was downloaded through MariaDB apt repo

Attachments: File ck2_new_db.sql     File descendants.sql    
Issue Links:
Relates
relates to MDEV-16661 Query with recursive cte inside store... Closed
relates to MDEV-25464 Joining CTEs inside a function fails ... Closed

 Description   

I'm trying to wrap a recursive cte query inside a function. The query works outside the function and the function statement itself is accepted without error. When the function is used however it reports that the table I'm trying to query inside the function does not exist. A "use" statement is used before the function definition and specifying the database.table combination does not change the result.

Here is the exact error if that is helpful:

ERROR 1146 (42S02) at line 33: Table 'ck2.Characters' doesn't exist

I've attached the full SQL, but this is a isolated example that has the same problem:

create or replace database ck2;
 
use ck2;
 
 
 
create table Characters (
 
    id int unsigned key,
 
 
 
    mother_id int unsigned check (mother_id != id),
 
    foreign key (mother_id)
 
        references Characters(id)
 
        on delete cascade,
 
 
 
    real_father_id int unsigned check(real_father_id != id),
 
    foreign key (real_father_id)
 
        references Characters(id)
 
        on delete cascade
 
);
 
 
 
insert into Characters values
 
    (0, null, null),
 
    (1, 0, null),
 
    (2, 1, null)
 
;
 
 
 
create or replace function count_descendants(cid int unsigned) returns int unsigned return (
 
    with recursive Descendants as (
 
        select * from Characters where id = cid
 
        union
 
        select c.* from Characters as c, Descendants as d        
            where d.id = c.mother_id or d.id = c.real_father_id
 
    ) select count(distinct(id)) from Descendants
 
    );
 
 
 
select count_descendants(0);



 Comments   
Comment by Alice Sherepa [ 2018-07-02 ]

Thanks for the report! Reproduced on 10.2 commit 8639e288086247ce39917f4cb55191c8bb5b5a8c, 10.3

CREATE or replace TABLE t1 (id int);
 
INSERT INTO t1 VALUES (0), (1),(2);
 
 
 
WITH recursive cte AS (SELECT id from t1 union select 3 from cte) SELECT count(id) FROM cte;
 
 
 
CREATE OR REPLACE FUNCTION func() RETURNS int RETURN (
 
WITH recursive cte AS (SELECT id from t1 union select 3 from cte) SELECT count(id) FROM cte);
 
 
SELECT func();


CREATE or replace TABLE t1 (id int);
 
INSERT INTO t1 VALUES (0), (1),(2);
 
WITH recursive cte AS (SELECT id from t1 union select 3 from cte) SELECT count(id) FROM cte;
 
count(id)
 
4
 
CREATE OR REPLACE FUNCTION func() RETURNS int RETURN (
 
WITH recursive cte AS (SELECT id from t1 union select 3 from cte) SELECT count(id) FROM cte);
 
SELECT func();
 
main.1_my                                [ fail ]
 
        Test ended at 2018-07-02 14:51:10
 
 
 
CURRENT_TEST: main.1_my
 
mysqltest: At line 9: query 'SELECT func()' failed: 1146: Table 'test.t1' doesn't exist

Comment by Igor Babaev [ 2018-07-21 ]

A fix for this bug was pushed into 10.2

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