Andrea Sella
2018-11-21 17:02:01 UTC
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]
this section[1]?
Thank you,
Andrea
[1] https://drill.apache.org/docs/developing-an-aggregate-function/
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 thanfoo, [1,2,3,3,5,6]
this section[1]?
Thank you,
Andrea
[1] https://drill.apache.org/docs/developing-an-aggregate-function/