LuciferYang opened a new pull request, #45811:
URL: https://github.com/apache/spark/pull/45811
### What changes were proposed in this pull request?
When I reviewed the changes in SPARK-45685, I found an old user case that is
no longer supported:
```scala
Seq(1).toDF("id").groupBy(Stream($"id" + 1, $"id" + 2): _*).sum("id")
```
```
[info] - SPARK-38221: group by `Stream` of complex expressions should not
fail *** FAILED *** (51 milliseconds)
[info] org.apache.spark.SparkException: Task not serializable
[info] at
org.apache.spark.util.SparkClosureCleaner$.clean(SparkClosureCleaner.scala:45)
[info] at org.apache.spark.SparkContext.clean(SparkContext.scala:2718)
[info] at
org.apache.spark.rdd.RDD.$anonfun$mapPartitionsWithIndex$1(RDD.scala:908)
[info] at
org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:151)
[info] at
org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:112)
[info] at org.apache.spark.rdd.RDD.withScope(RDD.scala:411)
[info] at org.apache.spark.rdd.RDD.mapPartitionsWithIndex(RDD.scala:907)
[info] at
org.apache.spark.sql.execution.WholeStageCodegenExec.doExecute(WholeStageCodegenExec.scala:762)
...
```
Since this is a historical user usage, and although the `Stream` type has
been deprecated after Scala 2.13.0, it has not been removed, so this PR
restores the support for `Stream` type in `Dataset#groupBy`.
### Why are the changes needed?
Restore the support for `Stream` type in `Dataset#groupBy`
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
- Pass GitHub Actions
- Restored the test case for dataset group by `Stream`.
### Was this patch authored or co-authored using generative AI tooling?
No
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