combine keyword search and tax query in wp_query

I’ve been trying to create a custom search query, and I’ve made some progress on it, but have hit another roadbump.

I’m trying to combine the meta_query, keyword search (‘s’) and tax_query in a wp_query with an ‘OR’ relationship.

I’ve gotten the meta_query and ‘s’ to work together thanks to this fantastic post:
https://wordpress.stackexchange.com/questions/99849/search-that-will-look-in-custom-field-post-title-and-post-content

however, the tax_query is still giving me trouble. I tried adding it in via the same method, but it seems as though wordpress does some other magic with tax_query before it outputs it to the SQL query.

Here’s what I’ve got thus far:

        function add_join_wpse_news($joins) 
        {  
            global $wpdb;
            return $joins . " INNER JOIN {$wpdb->postmeta} ON ({$wpdb->posts}.ID = {$wpdb->postmeta}.post_id)" ;
        }
        function alter_search_wpse_news($search,$qry)
        {
            global $wpdb;
            $add = $wpdb->prepare("({$wpdb->postmeta}.meta_key = '_et_builder_settings' AND CAST({$wpdb->postmeta}.meta_value AS CHAR) LIKE '%%%s%%')",$qry->get('s'));
            $pat = '|(((.+)))|';
            $search = preg_replace($pat,'(($1 OR '.$add.'))',$search);
            return $search;
        }
        function alter_groupby_wpse_news($groupby)
        {
            global $wpdb;

            $mygroupby = "{$wpdb->posts}.ID";
            if( preg_match( "/$mygroupby/", $groupby )) {
                // grouping we need is already there
                return $groupby;
            }

            if( !strlen(trim($groupby))) {
                // groupby was empty, use ours
                return $mygroupby;
            }

            // wasn't empty, append ours
            return $groupby . ", " . $mygroupby;
        }
        add_filter('posts_join','add_join_wpse_news');
        add_filter('posts_search','alter_search_wpse_news',1,2);
        add_filter('posts_groupby', 'alter_groupby_wpse_news' );

        $args_condensed = array
        (
            'post_type' => 'news',
            'paged' => $paged,
            's' => $getname,
        );
        $the_query = new WP_Query($args_condensed);
        $max_pages = $the_query->max_num_pages;
        echo $GLOBALS['the_query']->request;

And this works. However, it doesn’t include the search for the the Tags or Categories. I attempted to add it in manually via the posts_join and posts_search filter, but then I realized that wordpress is comparining values in the tax_query BEFORE the outputted SQL query, which causes problems when trying to add it in.

Any help would be greatly appreciated.

EDIT: for clarification, I’m trying to add in:

'tax_query' => array
            (
                'relation' => 'OR',
                array //Search Tag
                (
                    'taxonomy' => 'post_tag',
                    'field' => 'slug',
                    'terms' => array($getname)
                ),
                array //Search Category
                (
                    'taxonomy' => 'category',
                    'field' => 'slug',
                    'terms' => array($getname),
                ),
                array //Search Category (Single Words)
                (
                    'taxonomy' => 'category',
                    'field' => 'slug',
                    'terms' => explode(" ",$getname),
                ),
                array //Search Tag (Single Words)
                (
                    'taxonomy' => 'post_tag',
                    'field' => 'slug',
                    'terms' => explode(" ",$getname),
                )
            ),

but with an OR type relationship as opposed to the AND relationship wordpress adds by default.