How can I filter products based on their SKU code?

A new column was created in the orders, but I'm having a hard time understanding how I can search for it.

I have a column populated with product SKU's. How can I return search results based on that info?

    // Add Column
    add_filter( 'manage_edit-shop_order_columns', 'custom_shop_order_column',11);
    function custom_shop_order_column($columns)
        //add columns
        $columns['SKU'] = __( 'SKU');
        return $columns;

    // Add Column Data
    add_action( 'manage_shop_order_posts_custom_column' , 'custom_orders_list_column_content', 10, 2 );
    function custom_orders_list_column_content( $column, $post_id )
        switch ( $column )
            case 'SKU' :
                $order = wc_get_order( $post_id );
                $order_item = $order->get_items();

                foreach ( $order_item as $item_id ) {

                    $product_id = $item_id['product_id']; 

                    $myVarOne = get_post_meta($product_id, '_sku', true);

                    echo $myVarOne;

    // Failed search functionality
    add_filter( 'woocommerce_shop_order_search_fields', 'woocommerce_shop_order_search_SKU' );
    function woocommerce_shop_order_search_SKU( $search_fields ) {
        $search_fields[] = '_sku';
        return $search_fields;

I used a plugin "WooCommerce Filter Orders by Product" and modified their search by ID, added a get_post_meta(), and now have the ability to filter products by ID.

Plugin: https://en-ca.wordpress.org/plugins/woocommerce-filter-orders-by-product/

Modified code:

    // Display dropdown
    function foa_product_filter_in_order(){
        global $typenow, $wpdb;

        if ( 'shop_order' != $typenow ) {

        $sql="SELECT ID,post_title FROM $wpdb->posts WHERE post_type = 'product' AND post_status = 'publish'";
        $all_posts = $wpdb->get_results($sql, ARRAY_A);

        $values = array();

        foreach ($all_posts as $all_post) {
            $values[$all_post['ID']] = get_post_meta($all_post['ID'], '_sku', true);

        <select name="foa_order_product_filter">
        <option value=""><?php _e('All products', 'foa'); ?></option>
            $current_v = isset($_GET['foa_order_product_filter'])? $_GET['foa_order_product_filter']:'';
            foreach ($values as $label) {
                        '<option value="%s"%s>%s</option>',
                        $value == $current_v? ' selected="selected"':'',

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