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https://issues.apache.org/jira/browse/SPARK-29026?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-29026.
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Fix Version/s: 3.0.0
Resolution: Fixed
Issue resolved by pull request 25736
[https://github.com/apache/spark/pull/25736]
> Improve error message when constructor in `ScalaReflection` isn't found
> -------------------------------------------------------------------------
>
> Key: SPARK-29026
> URL: https://issues.apache.org/jira/browse/SPARK-29026
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.4.4
> Reporter: Mick Jermsurawong
> Assignee: Mick Jermsurawong
> Priority: Minor
> Fix For: 3.0.0
>
>
> Currently, a method to get constructor parameters from a given type
> `constructParams` in `ScalaReflection` will throw exception if the type has
> no constructor
> {code:java}
> <none> is not a term
> scala.ScalaReflectionException: {code}
> In the normal usage of ExpressionEncoder, this can happen if the type is
> interface extending `scala.Product`.
> Also, since this is a protected method, this could have been other arbitrary
> types without constructor.
> To reproduce the error, the following will fail when trying to get
> {{Encoder[NoConstructorProductTrait]}}
> {code:java}
> trait NoConstructorProductTrait extends scala.Product {} {code}
>
>
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