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https://issues.apache.org/jira/browse/SPARK-24216?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan reassigned SPARK-24216:
-----------------------------------
Assignee: Fangshi Li
> Spark TypedAggregateExpression uses getSimpleName that is not safe in scala
> ---------------------------------------------------------------------------
>
> Key: SPARK-24216
> URL: https://issues.apache.org/jira/browse/SPARK-24216
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.3.0, 2.3.1
> Reporter: Fangshi Li
> Assignee: Fangshi Li
> Priority: Major
> Fix For: 2.4.0
>
>
> When user create a aggregator object in scala and pass the aggregator to
> Spark Dataset's agg() method, Spark's will initialize
> TypedAggregateExpression with the nodeName field as
> aggregator.getClass.getSimpleName. However, getSimpleName is not safe in
> scala environment, depending on how user creates the aggregator object. For
> example, if the aggregator class full qualified name is
> "com.my.company.MyUtils$myAgg$2$", the getSimpleName will throw
> java.lang.InternalError "Malformed class name". This has been reported in
> scalatest
> [scalatest/scalatest#1044|https://github.com/scalatest/scalatest/pull/1044]
> and discussed in many scala upstream jiras such as SI-8110, SI-5425.
> To fix this issue, we follow the solution in
> [scalatest/scalatest#1044|https://github.com/scalatest/scalatest/pull/1044]
> to add safer version of getSimpleName as a util method, and
> TypedAggregateExpression will invoke this util method rather than
> getClass.getSimpleName.
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