Hi, I've just started with Apache Drill and I'd like to write a custom aggregate function in order to concatenate array fields.
I have seen that the feature is still in alpha and before trying to make it work I would like to know if at this stage my custom function is possible. The main idea is trying to achieve something like this: a,b foo, [1,2,3] foo, [3,5,6] > select my_custom_fun(b) from table group by a > foo, [1,2,3,3,5,6] If it is possible, there are any other available documentation other than this section[1]? Thank you, Andrea [1] https://drill.apache.org/docs/developing-an-aggregate-function/
