Please keep in mind that you need to use the result of this query instead of showing the result from
$wpdb class. Could you please try the following code?
$args = array( 'meta_query' => array( 'relation' => 'OR', array( 'key' => 'url_field_past', 'compare' => '=', 'value' => '' ), array( 'key' => 'url_field_past', 'compare' => 'NOT EXISTS', ) ) ); $the_posts = get_posts($args); echo <pre>; print_r($the_posts);
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