A Server crash can be reproduced in the example below:

1) Create a database:

CREATE DATABASE sample;

2) Create a view with the following statement:

DROP VIEW IF EXISTS `v_test`;
CREATE VIEW `v_test`
AS
(
SELECT 1 AS `Column1`
FROM (SELECT 1) t1
)
UNION ALL
(
SELECT
CASE 1 > 1
WHEN 0 THEN 1
ELSE 0
END AS `Column1`
FROM (SELECT 2) t2
);

3) Run the following query:

Notes:

• You can run the query with or without the EXPLAIN operator but you will get the same result
• The query runs without error if `condition_pushdown_for_derived` is disabled

– EXPLAIN
SELECT *
FROM `v_test`
WHERE `v_test`.`Column1`= 1;

4) MariaDB has crashed.

Backtrace added to Attachments.