meta_query, how to search using both relation OR & AND?

I found the solution with some help.The code below worked perfectly.

    $args => array(        'relation' => 'AND',        array(            'relation' => 'OR',            array(                'key' => 'title',                'value' => $searchvalue,                'compare' => 'LIKE'            ),            array(                'key' => 'author',                'value' => $searchvalue,                'compare' => 'LIKE'            ),            array(                'key' => 'genre',                'value' => $searchvalue,                'compare' => 'LIKE'            )        ),        array(            'key' => 'rating',            'value' => $ratingvalue,            'compare' => '=',            'type' => 'NUMERIC'        )    ));

After a bit trial and error I find a solution to this. This is logical I mean meta_query does not supports the array for field "key", but giving the array in "key", I'm getting the perfect solution. I may be sound crazy but it's working like charm.

$args => array(    'relation' => 'AND',    array(        'key' => array('title','author','genre',),        'value' => $searchvalue,        'compare' => '='    ),    array(        'key' => 'rating',        'value' => $ratingvalue,        'compare' => '=',        'type' => 'NUMERIC'    ))

You only get a warning for "trim()" as we are passing an array instead of a string. Suppress that warning or Please add something if you find a better solution.