Case C-130/20: Judgment of the Court (Sixth Chamber) of 12 May 2021 (request for a preliminary ruling from the Juzgado de lo Social No 3 de Barcelona — Spain) — YJ v Instituto Nacional de la Seguridad Social (INSS) (Reference for a preliminary ruling — Equal treatment for men and women in matters of social security — Directive 79/7/EEC — Article 4(1) — Discrimination on ground of sex — National legislation providing for a pension maternity supplement to be granted to women who have had a certain number of children — Exclusion from entitlement to that pension supplement of women who have requested early retirement — Scope of Directive 79/7EEC)