[jira] [Closed] (FLINK-20522) Make implementing a built-in function straightforward

["Timo Walther (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-20522?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Timo Walther closed FLINK-20522.
--------------------------------
    Fix Version/s: 1.13.0
       Resolution: Fixed

Fixed in 1.13.0:

[table] Add built-in IFNULL function
commit df46f8948279d1ed89d7113919b4c4f720cf4199

[table] Add built-in TYPEOF function
commit 857a5b903b2ff65b2ae0d5ed67500a3d241415f4

[table-common] Reformat BuiltInFunctionDefinitions
commit a9da22996844fd4e98aa9f6815fe8ec3246b754e

[table-planner-blink] Migrate InternalAggregateFunction to BuiltInAggregateFunction
commit 7fd160397a146f588ba64d01818f3de27bbf60b5

[table] Introduce built-in runtime functions
commit bd3bb36505692a8d317d8e853b0f137b7e8c7439

[table] Add SpecializedFunction for hooking into the UDF generation
commit e5bf1cbf42cfc917bf7e346301e3e3786feca89b

> Make implementing a built-in function straightforward
> -----------------------------------------------------
>
>                 Key: FLINK-20522
>                 URL: https://issues.apache.org/jira/browse/FLINK-20522
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Table SQL / API, Table SQL / Planner
>            Reporter: Timo Walther
>            Assignee: Timo Walther
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.13.0
>
>
> FLIP-65 has introduced new abstractions for functions. They make implementing user-defined functions straightforward. However, currently, these abstraction are not available for built-in functions. Adding a built-in function requires many changes at different locations as shown in FLINK-6810. This is error-prone, limits contributions, and is also not well supported by the current module system.



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