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From Chen Li <che...@gmail.com>
Subject Re: User Define Function (UDF) in AsterixDB
Date Sat, 04 Jun 2016 07:02:12 GMT
We had several separate discussions about UDF.  Is it possible to take
this chance to polish the documentation so that other users can rely
on the documentation to get started?

Chen

On Fri, Jun 3, 2016 at 12:08 AM, Xikui Wang <xikuiw@uci.edu> wrote:
> Hi Heri,
>
> Thanks for sharing the document. It is useful as the general structure of
> UDF remains the same.
>
> Best,
> Xikui
>
> On Thu, Jun 2, 2016 at 11:34 PM, Heri Ramampiaro <heriram@gmail.com> wrote:
>
>> Xikui,
>>
>> Enclosed is an instruction based on the older version of feeds and UDF
>> that perhaps could help you
>> figur out the principle behind installing external libs in AsterixDB
>>
>> Best,
>> -heri
>>
>>
>>
>>
>> > On Jun 2, 2016, at 23:44, Xikui Wang <xikuiw@uci.edu> wrote:
>> >
>> > Hi Abdullah,
>> >
>> > Thanks for your help. I met an error when I was trying to execute
>> 'install
>> > externallibtest testlib PATH/TO/testlib-zip-binary-assembly.zip' from the
>> > web query interface. Probably I used this in a wrong way?
>> >
>> > Best,
>> > Xikui
>> >
>> > On Thu, Jun 2, 2016 at 2:26 PM, abdullah alamoudi <bamousaa@gmail.com>
>> > wrote:
>> >
>> >> Hi Xikui,
>> >> 1. How to install UDF on instance running from Eclipse+
>> >> AsterixHyracksIntegrationUtil?
>> >>
>> >> There are a few external library test cases, you can look at them and
>> see
>> >> how we test those. One thing you will notice is that we only test a few
>> >> examples. Clearly, we can do better. You can find the test cases in:
>> >>
>> >>
>> >>
>> asterixdb/asterixdb/asterix-app/src/test/resources/runtimets/queries/external-library
>> >>
>> >> As for the difference between scalar, aggregate, and unnest functions,
>> here
>> >> is the way I see it:
>> >> 1. Scalar: one input to one output.
>> >> 2. Aggregate: 0 or more inputs to one output.
>> >> 3. Unnest: one input to 0 or more outputs.
>> >>
>> >> Hope that helps,
>> >> Abdullah.
>> >>
>> >> On Thu, Jun 2, 2016 at 11:40 PM, Xikui Wang <xikuiw@uci.edu> wrote:
>> >>
>> >>> Hi Devs,
>> >>>
>> >>> I want to use UDF to process the Tweets that I got from the feed, and
I
>> >> met
>> >>> following two questions. Hope you guys can help me or point me to the
>> >> right
>> >>> documentation.
>> >>>
>> >>> 1. How to install UDF on instance running from
>> >>> Eclipse+AsterixHyracksIntegrationUtil?
>> >>>
>> >>> Website only mentioned how to install with Managix. I am wondering if
>> >> there
>> >>> is a way for me to install it on instance running in Eclipse, which
is
>> >>> easier for debugging.
>> >>>
>> >>> 2. Implementation of UDF
>> >>>
>> >>> I found several UDFs in
>> >>>
>> >>>
>> >>
>> asterixdb/asterix-external-data/src/test/java/org/apache/asterix/external/library,
>> >>> like SumFunction, ParseTweetFunction. I assume if I want to implement
>> new
>> >>> UDF, it needs to implement IExternalScalarFunction interface and to
be
>> >> put
>> >>> under the same directory? I also found 'aggregate' and 'unnest' type
>> >> which
>> >>> is not implemented yet. Just out of curiosity, what is the difference
>> >>> between them?
>> >>>
>> >>> Thanks in advance! :)
>> >>>
>> >>> Best,
>> >>> Xikui
>> >>>
>> >>
>>
>>
>>

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