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https://issues.apache.org/jira/browse/SPARK-26991?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16781487#comment-16781487
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Jungtaek Lim commented on SPARK-26991:
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This issue could be extended to investigate the difference between
ScalaReflection and JavaTypeInference, as we have found another case as well.
[https://github.com/apache/spark/pull/23908#discussion_r261511454]
> Investigate difference of `returnNullable` between
> ScalaReflection.deserializerFor and JavaTypeInference.deserializerFor
> ------------------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-26991
> URL: https://issues.apache.org/jira/browse/SPARK-26991
> Project: Spark
> Issue Type: Task
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Jungtaek Lim
> Priority: Major
>
> This issue tracks the effort on investigation on difference between
> ScalaReflection.deserializerFor and JavaTypeInference.deserializerFor,
> especially the reason why Java side uses `returnNullable = true` whereas
> `returnNullable = false`.
> The origin discussion is linked here:
> https://github.com/apache/spark/pull/23854#discussion_r260117702
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