// add custom column
add_filter('manage_edit-post_columns', 'my_extra_views_column');
function my_extra_views_column($columns) {
    $columns['views'] =__('views');
    return $columns;
}

// display the content of the custom column
add_action( 'manage_post_posts_custom_column', 'my_cake_column_content', 10, 2 );
function my_cake_column_content( $column_name, $post_id ) {
    if ( 'views' != $column_name )
        return;

    echo get_post_views($post_id);
}

// add 'views' column to the sortable columns array
add_filter( 'manage_edit-post_sortable_columns', 'my_sortable_views_column' );
function my_sortable_views_column( $columns ) {
    $columns['views'] = 'views';

    return $columns;
}

/* Filter The query
*******************************************************************/
// join new table
add_filter('posts_join', 'my_views_table_join_filter');
function my_views_table_join_filter($join) {
    global $wp_query, $wpdb;

	$orderby = $_GET['orderby'];

    if( ! is_admin() )
        return;

    if( 'views' == $orderby ) {
        $join .= "LEFT JOIN `post_views` ON $wpdb->posts.ID = post_views.post_ID ";
    }
    return $join;
}

// add custom field to the select clause
add_filter('posts_fields', 'view_table_fields');
function view_table_fields($fields){
	global $wp_query, $wpdb;

	$orderby = $_GET['orderby'];

    if( ! is_admin() )
        return;

    if( 'views' == $orderby ) {
		$fields .= ", " . "count(post_views.post_ID) AS views";
    }
	return ($fields);
}

// add custom groupby clause
add_filter( 'posts_groupby', 'my_views_table_groupby_filter' );
function my_views_table_groupby_filter($groupby) {
    global $wpdb;

	$orderby = $_GET['orderby'];

    if( ! is_admin() )
        return;

    if( 'views' == $orderby ) {
    	$groupby = "{$wpdb->posts}.ID";
    }
    return $groupby;
}

// add custom order clause
add_filter( 'posts_orderby', 'my_views_table_orderby_filter' );
function my_views_table_orderby_filter($orderby_statement) {

	$orderby = $_GET['orderby'];

    if( ! is_admin() )
        return;

    if( 'views' == $orderby ) {
		$orderby_statement = "views $_GET[order]";
    }
	return $orderby_statement;
}