fold(a1) - aggregate function which should return an array of aggregated values, instead of a single value like other aggregate functions.
unfold([val1, val2, ..., valN]) - should repeat output record multiple times, once for each value in the argument array. Something relative to CROSS APPLY but easier to use.
fold(a1)- aggregate function which should return an array of aggregated values, instead of a single value like other aggregate functions.unfold([val1, val2, ..., valN])- should repeat output record multiple times, once for each value in the argument array. Something relative to CROSS APPLY but easier to use.