The aggregator fails if any pair of elements a and b of the group don’t satifies the equality a == b. The aggregator returns the sole value of the group.
Example:
table T = with
[| as A, as B |]
[| 0, "a" |]
[| 0, "a" |]
[| 1, "b" |]
[| 1, "b" |]
[| 1, "c" |]
table G[gdim] = by T.B
where T.B != "c"
show table "" a1b4 with
gdim
same(T.A)
group by gdim
The aggregator same succeeds on any empty group, and returns the default value for the given data type.