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https://issues.apache.org/jira/browse/SPARK-33002?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17202696#comment-17202696
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Apache Spark commented on SPARK-33002:
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User 'zero323' has created a pull request for this issue:
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
> Priority: Major
>
> 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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