$filter = $start . pg_escape_string($this->context->dbDriver->getConnection(), 'POLYGON((' . $coords[0] . ' ' . $coords[1] . ',' . $coords[0] . ' ' . $coords[3] . ',' . $coords[2] . ' ' . $coords[3] . ',' . $coords[2] . ' ' . $coords[1] . ',' . $coords[0] . ' ' . $coords[1] . '))') . $end;