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https://issues.apache.org/jira/browse/SPARK-24762?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16698655#comment-16698655
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Apache Spark commented on SPARK-24762:
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User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/23143
> Aggregator should be able to use Option of Product encoder
> ----------------------------------------------------------
>
> Key: SPARK-24762
> URL: https://issues.apache.org/jira/browse/SPARK-24762
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.4.0
> Reporter: Liang-Chi Hsieh
> Assignee: Liang-Chi Hsieh
> Priority: Major
> Fix For: 3.0.0
>
>
> Encoders has a limitation that we can't construct encoders for Option of
> Product at top-level, because in SparkSQL entire row can't be null.
> However for some use cases such as Aggregator, it should be able to construct
> encoders for Option of Product at non top-level.
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