I worked on it and achieved something. That I would like to share to other developers. This is not preferred way to do it, but for knowledge I am posting my answer.
$result = $wpdb->get_results('select t1.order_item_id, t2.* FROM
wp_woocommerce_order_items as t1 JOIN wp_woocommerce_order_itemmeta as t2 ON t1.order_item_id = t2.order_item_id
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