Using peach and unionAll, we can reconstruct the original table:

unionAll(peach(x->table(take(x.ticker, size(x.volume_all)) as ticker, x.volume_all as volume), t1), false)

In the code, peach performs parallel processing: it applies an anonymous function (x -> ...) to each row of t1, expanding the grouped ticker and volume_all arrays into multiple rows. unionAll: Combines all temporary tables into a single result.