/**
* join('table1')->on('table0.id=table1.id') => "JOIN table1 ON table0.id=table1.id"
* @param string $condition
* @return \phprs\ezsql\rules\select\JoinRule
*/
public function on($condition)
{
JoinOnImpl::on($this->context, $condition);
return new JoinRule($this->context);
}