Hi Andrea,
Can you post your code on github?
> On Nov 27, 2018, at 17:44, Andrea Sella <[email protected]> wrote:
>
> 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
