On the site every page load is recorded as a separate row in events with type page — the page path lives inside payload under the key path. Analytics wants to compose every user's «visit path» as a single string: all their pages joined with an arrow in chronological order, e.g. /home → /pricing → /checkout. For every user with at least one page event, glue their paths into one string with the separator → , ordering elements by event time. Sort by user id.