Meta Query complexa

meta-query.php

<?php

$paged   = (get_query_var('paged'))   ? get_query_var('paged') : 1;
$roi_min = (get_query_var('roi_min')) ? intval( get_query_var('roi_min') ) : false;
$roi_max = (get_query_var('roi_max')) ? intval( get_query_var('roi_max') ) : false;

$args = array(
    'post_type' 	 => 'post',
    'tax_query' 	 => array(...),
    'posts_per_page' => 10,
    'paged'     	 => $paged,
    'meta_query'      =>  array(
        'relation'         => 'OR',
        array(
            'relation'         => 'AND',
            array(
                'key'         => 'roi_min',
                'value'     => $roi_min,
                'compare'     => '>=',
                'type'        => 'NUMERIC'
            ),
            array(
                'key'         => 'roi_max',
                'value'     => $roi_max,
                'compare'     => '<=',
                'type'        => 'NUMERIC'
            )
        ),
        array(
            'relation'         => 'AND',
            array(
                'key'         => 'roi_min',
                'value'     => $roi_min,
                'compare'     => '>=',
                'type'        => 'NUMERIC'
            ),
            array(
                'key'         => 'roi_max',
                'value'     => '',
            )
        ),
        array(
            'relation'         => 'AND',
            array(
                'key'         => 'roi_min',
                'value'        => '',
            ),
            array(
                'key'         => 'roi_max',
                'value'        => '',
            ),
        ),
        array(                        
            'relation'         => 'AND',
            array(
                'key'         => 'roi_min',
                'compare'    => 'NOT EXISTS',
            ),
            array(
                'key'         => 'roi_max',
                'compare'    => 'NOT EXISTS',
            )
        ),
    ),
);
	
$reports = new WP_Query( $args );