GROUP_CONCAT and CASE WHEN about doctrine-extensions HOT 3 CLOSED

SELECT
    c0_.id AS id_0,
    c1_.id AS id_1,
    r2_. CODE AS code_2,
    GROUP_CONCAT(r3_.number) serial_all,
    GROUP_CONCAT(CASE WHEN r3_.cartItemId > 0 THEN r3_.number END) serial_selected,
    r2_.sku AS sku_6,
    r2_. NAME AS name_7,
    c0_.quantity AS quantity_8,
    c0_.price AS price_9,
    r3_.*
FROM
    cart_item c0_
LEFT JOIN cart c1_ ON c0_.cartId = c1_.id
LEFT JOIN ra_spare_city r5_ ON (c0_.itemId = r5_.id)
LEFT JOIN ra_spare r2_ ON r5_.productId = r2_.id
LEFT JOIN ra_spare_serial r3_ ON r2_.id = r3_.productId AND (c0_.id = r3_.cartItemId OR r3_.cartItemId IS NULL)
WHERE
    c0_.cartId = 1777
GROUP BY r2_.id

SELECT
 GROUP_CONCAT(CASE WHEN f.budget > 0 THEN f.budget ELSE 0 END) 
FROM Oro\\Entities\\Foo f GROUP BY f.code