Hi, I tried to implement it using ObjectHolder and ComplexWriter and it doesn't seem possible to achieve something general at this point.
Andrea On Wed, Nov 21, 2018 at 6:02 PM Andrea Sella <[email protected]> wrote: > 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/ > -- BR, Andrea
