ORIGINAL
--------
public void add_text_condition_subquery (string column, string val,
            bool negation=false)
        {
            string search_table = get_search_table_for_column (column);
            string sql = "%s IN (SELECT id FROM %s WHERE value %s= ?)".printf (
                column, search_table, (negation) ? "!" : "");
            add (sql, val);
        }


NEW
---
public void add_text_condition_subquery (string column, string val,
            bool negation=false)
        {
            string search_table = get_search_table_for_column (column);
            string sql = "%s %s= (SELECT id FROM %s WHERE value = ?)".printf (
                column, (negation) ? "!" : "", search_table);
            add (sql, val);
        }