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Posted to issues@flink.apache.org by "Rong Rong (JIRA)" <ji...@apache.org> on 2018/03/10 01:35:00 UTC
[jira] [Commented] (FLINK-8863) Add user-defined function support
in SQL Client
[ https://issues.apache.org/jira/browse/FLINK-8863?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16393942#comment-16393942 ]
Rong Rong commented on FLINK-8863:
----------------------------------
Hi [~twalthr], in the task description, there's no specification regarding where the UDF is loaded from; According to FLIP-24, seems like there's only MyToolBox.jar is described as containing UDF. Are we going to always assume UDFs are contained in a pre-defined JAR file?
> Add user-defined function support in SQL Client
> -----------------------------------------------
>
> Key: FLINK-8863
> URL: https://issues.apache.org/jira/browse/FLINK-8863
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Reporter: Timo Walther
> Assignee: Xingcan Cui
> Priority: Major
>
> This issue is a subtask of part two "Full Embedded SQL Client" of the implementation plan mentioned inĀ [FLIP-24|https://cwiki.apache.org/confluence/display/FLINK/FLIP-24+-+SQL+Client].
> It should be possible to declare user-defined functions in the SQL client. For now, we limit the registration to classes that implement {{ScalarFunction}}, {{TableFunction}}, {{AggregateFunction}}. Functions that are implemented in SQL are not part of this issue.
> I would suggest to introduce a {{functions}} top-level property. The declaration could look similar to:
> {code}
> functions:
> - name: testFunction
> from: class <-- optional, default: class
> class: org.my.MyScalarFunction
> constructor: <-- optional, needed for certain types of functions
> - 42.0
> - class: org.my.Class <-- possibility to create objects via properties
> constructor:
> - 1
> - true
> - false
> - "whatever"
> - type: INT
> value: 1
> {code}
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