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https://issues.apache.org/jira/browse/FLINK-25769?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Timo Walther closed FLINK-25769.
--------------------------------
    Fix Version/s: 1.15.0
       Resolution: Fixed

Fixed in master:

commit 72ed6b8f59a7cb200eb872bf8d4ba70d0b52cc30
[table-planner] Update some SqlFunction to new architecture

commit 54f1f9e4807f834173a018574191d698f3cbf937
[table] Introduce internal and versioned built-in functions

commit ce9c100f15887b9c451e512e4ec476b16824cac3
[table-common] Introduce hidden functions in module system

> Add internal functions and basic function versioning
> ----------------------------------------------------
>
>                 Key: FLINK-25769
>                 URL: https://issues.apache.org/jira/browse/FLINK-25769
>             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: 1.15.0
>
>
> As mentioned in FLIP-190:
> We keep the old function definition around under an internal name. The 
> physical plan after restore might look similar to:
> {code}
> == Optimized Physical Plan ==
> Calc(select=[$TO_TIMESTAMP_LTZ$1(f0)])
> {code}
> {{$TO_TIMESTAMP_LTZ$1}} has been returned by the ModuleManager.



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