[MDEV-16212] Memory leak with recursive CTE that uses global ORDER BY with recursive subquery Created: 2018-05-17  Updated: 2018-05-18  Resolved: 2018-05-18

Status: Closed
Project: MariaDB Server
Component/s: Optimizer - CTE
Affects Version/s: 10.2, 10.3
Fix Version/s: 10.2.16

Type: Bug Priority: Major
Reporter: Igor Babaev Assignee: Igor Babaev
Resolution: Fixed Votes: 0
Labels: None


 Description   

The following test case run in mtr

SET @@max_recursive_iterations = 2;
 
 
 
WITH RECURSIVE qn AS (
 
SELECT 1 FROM dual UNION ALL
 
SELECT 1 FROM qn
 
ORDER BY (SELECT * FROM qn))
 
SELECT count(*) FROM qn;

causes memory leak in the server:

mysqld: /home/igor/maria-git/10.2-test/sql/sql_class.cc:1647: virtual THD::~THD(): Assertion `status_var.local_memory_used == 0 || !debug_assert_on_not_freed_memory' failed.



 Comments   
Comment by Igor Babaev [ 2018-05-18 ]

A fix for this bug was pushed into 10.2.

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