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https://issues.apache.org/jira/browse/SPARK-44528?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-44528.
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Fix Version/s: 3.5.0
4.0.0
Resolution: Fixed
Issue resolved by pull request 42132
[https://github.com/apache/spark/pull/42132]
> Spark Connect DataFrame does not allow to add custom instance attributes and
> check for it
> -----------------------------------------------------------------------------------------
>
> Key: SPARK-44528
> URL: https://issues.apache.org/jira/browse/SPARK-44528
> Project: Spark
> Issue Type: Bug
> Components: Connect
> Affects Versions: 3.4.1
> Reporter: Martin Grund
> Assignee: Martin Grund
> Priority: Major
> Fix For: 3.5.0, 4.0.0
>
>
> ```
> df = spark.range(10)
> df._test = 10
> assert(hasattr(df, "_test"))
> assert(!hasattr(df, "_test_no"))
> ```
> Treats `df._test` like a column
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