Override column selection in jpa - jpa

Question

I need to select an integer column (int) by left joining its entity.
When there are no rows, its value is "null", what I need is to have 0 instead of null.
I searched for an annotation or a way to override the select query with no result. Note that I'm using eclipselink.
I am searching for something that always makes the selection of the column "coalesce(columnName,0)" instead of columnName.
EDIT:
A code Sample:
public class parent{
#Id
private int id;
private String field1;
private String field2;
private List<Child> children;
}
public class Child{
#Id
private int id;
private int myNumber;
private String field;
}
The JPA Query is similar to
SELECT p FROM parent p LEFT JOIN p.children c ON c.field = 'aaa' WHERE p.field1 = 'bbb'
The translation of this query would be:
SELECT t0.id, t0.field1, t0.field2, t1.id, t1.myNumber, t1.field
FROM parent t0 LEFT OUTER JOIN child t1 on t0.id = t1.parent_id AND t1.field = 'aaaa
WHERE t0.field1 = 'bbb'
In the case where there are no rows in CHILD, the field: t1.myNumber will have the value null.
To fix it, in Sql statement, normally I will use coalesce(t1.myNumber,0). So the query will be:
SELECT t0.id, t0.field1, t0.field2, t1.id, coalesce(t1.myNumber,0), t1.field
FROM parent t0 LEFT OUTER JOIN child t1 on t0.id = t1.parent_id AND t1.field = 'aaaa
WHERE t0.field1 = 'bbb'
What I need is to accomplish this result using some annotation, or any other tool if exists, whithout changing the JPA query if possible.