Let’s say I have a Tweets dataset, and I have a SyntheticTweeterAdapter to feed
the data. It will generate the record like r1: { “id”: 1, “tweet” : “blabla”,
“coordinate”: point(1,2) }
During the feeding, I want to have an UDF that can enrich the dataset by
appending another field to the record.
E.g. I can add the address information of the previous r1 : { “id”: 1, “tweet”
: “blabla”, “coordinate”: point(1,2), “address”: [“Irvine, CA”] } .
In order to get the mapping from “coordinate” to “address”, I need to run a AQL
query like
for $t in feed Tweets
return { “id”: $t.id, “tweet”: $t.tweet, “coordinate”: $t.coordinate,
“address”: for $city in dataset (“AsterixCityTable”) where spatio-intersect
($t.coordinate, $city.geometry) return $city.name
}
It seems more like the second one: using an AQL function as a UDF connector.
But I’m not very certain about it. It will be very helpful if you can provide
some existing UDF example, not necessary the AQL ones. Thank you!
> On Oct 29, 2015, at 3:53 PM, Heri Ramampiaro <[email protected]> wrote:
>
>>
>> 2. Can we use AQL function in those kind of feed UDFs?
>
> Can you give an example of what you are trying to do?
> I.e do you want to run an AQL inside a UDF or use an AQL function as a
> UDF connected to a running feed?
>
> -heri
Best,
Jianfeng Jia
PhD Candidate of Computer Science
University of California, Irvine
