[
https://issues.apache.org/jira/browse/SPARK-24216?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Fangshi Li updated SPARK-24216:
-------------------------------
Description:
When we create a aggregator object within a function in scala and pass the
aggregator to Spark Dataset's aggregation method, Spark's will initialize
TypedAggregateExpression with the name field as
aggregator.getClass.getSimpleName. However, getSimpleName is not safe in scala
environment, for example, if the aggregator class full qualified name is
"com.my.company.MyUtils$myAgg$2$", the getSimpleName will throw error
"Malformed class name". This has been reported in scalatest
[https://github.com/scalatest/scalatest/pull/1044] and scala upstream jira
[https://issues.scala-lang.org/browse/SI-8110].
To fix this issue, we follow the solution in
[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.
was:
When we create a aggregator object within a function in scala and pass the
aggregator to Spark Dataset's aggregation method, Spark's will initialize
TypedAggregateExpression with the name field as
aggregator.getClass.getSimpleName. However, getSimpleName is not safe in scala
environment, for example, if the aggregator class full qualified name is
"com.my.company.MyUtils$myAgg$2$", the getSimpleName will throw exception
"Malformed class name". This has been reported in scalatest
[https://github.com/scalatest/scalatest/pull/1044] and scala upstream jira
[https://issues.scala-lang.org/browse/SI-8110].
To fix this issue, we follow the solution in
[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.
> 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
> Priority: Major
>
> When we create a aggregator object within a function in scala and pass the
> aggregator to Spark Dataset's aggregation method, Spark's will initialize
> TypedAggregateExpression with the name field as
> aggregator.getClass.getSimpleName. However, getSimpleName is not safe in
> scala environment, for example, if the aggregator class full qualified name
> is "com.my.company.MyUtils$myAgg$2$", the getSimpleName will throw error
> "Malformed class name". This has been reported in scalatest
> [https://github.com/scalatest/scalatest/pull/1044] and scala upstream jira
> [https://issues.scala-lang.org/browse/SI-8110].
> To fix this issue, we follow the solution in
> [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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