Stuff

       $stmt = "SELECT
                    fld_id,
                    fld_title,
                    fld_type,
                    fld_report_form_required,
                    fld_anonymous_form_required,
                    fld_close_form_required,
                    " . self::getDBValueFieldSQL() . " as value,
                    icf_value,
                    icf_value_date,
                    icf_value_integer,
                    fld_min_role
                 FROM
                    (
                    " . APP_DEFAULT_DB . "." . APP_TABLE_PREFIX . "custom_field,
                    " . APP_DEFAULT_DB . "." . APP_TABLE_PREFIX . "project_custom_field
                    )
                 LEFT JOIN
                    " . APP_DEFAULT_DB . "." . APP_TABLE_PREFIX . "issue_custom_field
                 ON
                    pcf_fld_id=icf_fld_id AND
                    icf_iss_id=" .  Misc::escapeInteger($iss_id) . "
                 WHERE
                    pcf_fld_id=fld_id AND
                    pcf_prj_id=" .  Misc::escapeInteger($prj_id) . " AND
                    fld_min_role <= " . $usr_role;