Unlike older Oracle versions, 19c PDFs are bundled into a single ZIP on OTN. Instead, you access them via the official Oracle Help Center:
CREATE OR REPLACE FUNCTION new_way(dataset IN ANY) RETURN VARCHAR2 SQL_MACRO(SCALAR) AS BEGIN RETURN q'[ 'migration complete at ' || TO_CHAR(SYSDATE, 'YYYY-MM-DD HH24:MI:SS') ]'; END; / oracle sql 19c pdf new