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https://issues.apache.org/jira/browse/SPARK-32090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17143832#comment-17143832
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Apache Spark commented on SPARK-32090:
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User 'Ngone51' has created a pull request for this issue:
https://github.com/apache/spark/pull/28923
> UserDefinedType.equal() does not have symmetry
> -----------------------------------------------
>
> Key: SPARK-32090
> URL: https://issues.apache.org/jira/browse/SPARK-32090
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.1.1, 2.2.0, 2.3.0, 2.4.0, 3.0.0
> Reporter: wuyi
> Priority: Major
>
> ExampleSubTypeUDT.userClass is a subclass of ExampleBaseTypeUDT.userClass
> val udt1 = new ExampleBaseTypeUDT
> val udt2 = new ExampleSubTypeUDT
> println(udt1 == udt2) // true
> println(udt2 == udt1) // false
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