We’ve started the development of a new report for product variations ????
The new reports are being developed in a feature plugin, that’s currently in Alpha. You can view all the details here – https://github.com/woocommerce/wc-admin
We’d love anyone who’s expressed interest to follow the project along.David Šuška commented
It would be great to have this functionality.
I have tried to figure it out myself and found out simple SQL solution :) http://davidsuska.cz/woocommerce-report-by-product-variations/
SELECT `meta_value`, COUNT(*) FROM `wp_woocommerce_order_itemmeta` WHERE `meta_key` LIKE 'NAME-OF-THE-ATRIBUTE' GROUP BY `meta_value`