Doctrine SQL query: works on MySQL, on PostgreSQL won't

Question

This is a query automatically generated by Taggable extension for Doctrine ORM.

SELECT t.id AS t__id, t.name AS t__name, COUNT(DISTINCT i.id) AS i__0,
   (COUNT(DISTINCT i.id)) AS i__1
FROM taggable_tag t
LEFT JOIN cms__model__image_taggable_tag c ON (t.id = c.tag_id)
LEFT JOIN image i ON i.id = c.id
WHERE t.id IN
    (SELECT doctrine_subquery_alias.id
     FROM
       (SELECT DISTINCT t2.id, (COUNT(DISTINCT i2.id)) AS i2__1
        FROM taggable_tag t2
        LEFT JOIN cms__model__image_taggable_tag c2 ON (t2.id = c2.tag_id)
        LEFT JOIN image i2 ON i2.id = c2.id
        GROUP BY t2.id HAVING i2__1 > 0
        ORDER BY i2__1 DESC LIMIT 10) AS doctrine_subquery_alias)
GROUP BY t.id HAVING i__1 > 0
ORDER BY i__1 DESC

It works when using MySql, but won't work with PostgreSql.

I get: column i2__1 not found or column i__2 not found.

Are aliases disallowed when using COUNT(DISTINCT)?
How this query should look like to work on PostgreSql?

Answer 1

You could try to replace i2__1 by COUNT(DISTINCT i2.id) in the HAVING-clause of the sub-select, or remove the parenthesis around COUNT(DISTINCT i2.id).

You might also have to add t__name to the GROUP BY-clause of the main select.