Case C-490/18: Judgment of the Court (Ninth Chamber) of 16 October 2019 (request for a preliminary ruling from the Budapest Környéki Közigazgatási és Munkaügyi Bíróság — Hungary) — SD v Agrárminiszter (Reference for a preliminary ruling — Common agricultural policy — Apiculture sector — Regulation (EU) No 1308/2013 — Delegated Regulation (EU) 2015/1366 — Application for aid — Conditions — Minimum number of bee colonies — Fixing with retro-active effect — Principle of legal certainty — Principle of protection of legitimate expectations)