Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/21921#discussion_r206943900
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/continuous/ContinuousRateStreamSource.scala
---
@@ -91,7 +90,7 @@ class RateStreamContinuousReader(options:
DataSourceOptions)
i,
numPartitions,
perPartitionRate)
- .asInstanceOf[InputPartition[Row]]
+ .asInstanceOf[InputPartition[InternalRow]]
--- End diff --
I didn't dig into it as the cast was already there. The reason seems to be,
`java.util.List` isn't covariant.
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