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Posted to issues@spark.apache.org by "Enrico Minack (Jira)" <ji...@apache.org> on 2022/04/11 20:39:00 UTC
[jira] [Updated] (SPARK-38864) Melt function for Dataset API
[ https://issues.apache.org/jira/browse/SPARK-38864?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Enrico Minack updated SPARK-38864:
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Description:
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.
was:
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.
> 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
> Priority: Major
>
> 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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