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https://issues.apache.org/jira/browse/SPARK-38864?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Enrico Minack updated SPARK-38864:
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Summary: Unpivot / melt function for Dataset API (was: Melt function for
Dataset API)
> Unpivot / melt function for Dataset API
> ---------------------------------------
>
> Key: SPARK-38864
> URL: https://issues.apache.org/jira/browse/SPARK-38864
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Affects Versions: 3.4.0
> Reporter: Enrico Minack
> Assignee: Enrico Minack
> Priority: Major
> Fix For: 3.4.0
>
>
> As pointed out in SPARK-30273 and SPARK-37799, the Dataset API provides the
> {{pivot}} method but not its reverse operation {{melt}}. It is only provided
> as part of the PySpark Pandas API, implemented in Python. However, {{melt}}
> is not available via the PySpark DataFrame API, nor through Spark Scala
> Dataset API.
> As mentioned in
> [#26912|https://github.com/apache/spark/pull/26912#pullrequestreview-332975715],
> it should be implemented in Scala and invoked from PySpark.
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