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  • wp-includes/meta.php LINE 765

    			if ( 'NOT EXISTS' == $meta_compare ) {
    				$join[$i]  = "LEFT JOIN $meta_table";
    				$join[$i] .= $i ? " AS $alias" : '';
    				$join[$i] .= " ON ($primary_table.$primary_id_column = $alias.$meta_id_column AND $alias.meta_key = '$meta_key')";
    
    				$where[$k] = ' ' . $alias . '.' . $meta_id_column . ' IS NULL';
    
    				continue;
    			}