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https://issues.apache.org/jira/browse/SPARK-33002?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-33002.
----------------------------------
    Fix Version/s: 3.1.0
       Resolution: Fixed

Issue resolved by pull request 29879
[https://github.com/apache/spark/pull/29879]

> Post-port removal of non-API stubs
> ----------------------------------
>
>                 Key: SPARK-33002
>                 URL: https://issues.apache.org/jira/browse/SPARK-33002
>             Project: Spark
>          Issue Type: Sub-task
>          Components: PySpark
>    Affects Versions: 3.1.0
>            Reporter: Maciej Szymkiewicz
>            Assignee: Maciej Szymkiewicz
>            Priority: Major
>             Fix For: 3.1.0
>
>
> To simplify initial port we merge all existing stubs.
> However, some of these cover non-API components and are usually dynamically 
> annotated (generated with stubgen).
> This includes modules like {{serializers}}, {{utils}}, {{shell}}, {{worker}}, 
> etc.
> These can be safely removed as:
> - MyPy can infer types from the source, where stub is not present.
> - No longer provide value, when corresponding modules are present in the same 
> directory structure.
> - Annotations are here primarily to help end users, not Spark developers and 
> many of the annotations cannot be meaningfully refined.
> It should also reduce overhead of maintaining annotations (especially when 
> places where we don't guarantee signature stability).



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