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Posted to issues@spark.apache.org by "Enrico Minack (Jira)" <ji...@apache.org> on 2022/04/11 20:07:00 UTC

[jira] [Created] (SPARK-38864) Melt function for Dataset API

Enrico Minack created SPARK-38864:
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             Summary: 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


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 re-uses from PySpark.



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