Admin, filtering posts list with INNER JOIN

I'm developping a Wordpress plugin in witch I have created some custom posts and I use meta datas to link them together.

On the admin side, I want to be able to filter posts list using those relations. I guess I would need to use INNER JOIN but I don't know how.

For now all I have is :

add_filter( 'parse_query', 'mypostsfilteringfunction' );
function mypostsfilteringfunction( $query ){

        // if post_type matches : 
        // then I need to be able to add innerjoin into $query

}

Thanks in advance for your help.

via Chebli Mohamed