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From "Luke Cwik (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (BEAM-2445) DSL SQL to use service locator pattern to automatically register UDFs
Date Tue, 13 Jun 2017 19:38:00 GMT

    [ https://issues.apache.org/jira/browse/BEAM-2445?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16048295#comment-16048295
] 

Luke Cwik commented on BEAM-2445:
---------------------------------

This could be used to register tables as well but I'm not sure if there is much value in libraries
registering tables within the global namespace.

> DSL SQL to use service locator pattern to automatically register UDFs
> ---------------------------------------------------------------------
>
>                 Key: BEAM-2445
>                 URL: https://issues.apache.org/jira/browse/BEAM-2445
>             Project: Beam
>          Issue Type: Improvement
>          Components: dsl-sql
>            Reporter: Luke Cwik
>            Assignee: Xu Mingmin
>            Priority: Minor
>              Labels: dsl_sql_merge
>
> Use a service locator pattern to find UDFs that can be registered. The service loader
can be used to register UDFs for standard functions via DSL SQL, additional UDFs registered
by third party libraries, and end user created UDFs.
> Example ServiceLoader usage within Apache Beam to find coder providers:
> https://github.com/apache/beam/blob/7126fdc6ee5671e99a2dede3f25ba616aa0e8fa4/sdks/java/core/src/main/java/org/apache/beam/sdk/coders/CoderRegistry.java#L147



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