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https://issues.apache.org/jira/browse/SPARK-26832?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-26832:
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Assignee: Apache Spark
> Avoid project creation per record at Python's grouped vectorized UDF
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>
> Key: SPARK-26832
> URL: https://issues.apache.org/jira/browse/SPARK-26832
> Project: Spark
> Issue Type: Improvement
> Components: PySpark, SQL
> Affects Versions: 2.3.2, 2.4.0, 3.0.0
> Reporter: Hyukjin Kwon
> Assignee: Apache Spark
> Priority: Major
>
> https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/python/FlatMapGroupsInPandasExec.scala#L148
> this line seems to creating projection per each record.
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