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https://issues.apache.org/jira/browse/SPARK-41498?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17699010#comment-17699010
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Apache Spark commented on SPARK-41498:
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User 'cloud-fan' has created a pull request for this issue:
https://github.com/apache/spark/pull/40371
> Union does not propagate Metadata output
> ----------------------------------------
>
> Key: SPARK-41498
> URL: https://issues.apache.org/jira/browse/SPARK-41498
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.1.2, 3.2.0, 3.1.3, 3.2.1, 3.3.0, 3.2.2, 3.3.1
> Reporter: Fredrik Klauß
> Assignee: Fredrik Klauß
> Priority: Major
> Fix For: 3.4.0
>
>
> Currently, the Union operator does not propagate any metadata output. This
> makes it impossible to access any metadata if a Union operator is used, even
> though the children have the exact same metadata output.
> Example:
>
> {code:java}
> val df1 = spark.read.load(path1)
> val df2 = spark.read.load(path2)
> df1.union(df2).select("_metadata.file_path"). // <-- fails{code}
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