Case C-16/19: Judgment of the Court (Grand Chamber) of 26 January 2021 (request for a preliminary ruling from the Sąd Okręgowy w Krakowie — Poland) — VL v Szpital Kliniczny im. dra J. Babińskiego Samodzielny Publiczny Zakład Opieki Zdrowotnej w Krakowie (Reference for a preliminary ruling — Social policy — Equal treatment in employment and occupation — Directive 2000/78/EC — Article 2(1) and (2)(a) and (b) — ‘Concept of discrimination’ — Direct discrimination — Indirect discrimination — Discrimination on grounds of disability — Difference in treatment within a group of workers with disabilities — Grant of an allowance to workers with disabilities who have submitted disability certificates after a date chosen by the employer — Exclusion of workers with disabilities who have submitted their certificates before that date)