kiszk commented on a change in pull request #24865: [SPARK-27100][SQL] 
dag-scheduler-event-loop" java.lang.StackOverflowError
URL: https://github.com/apache/spark/pull/24865#discussion_r294092572
 
 

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 File path: 
sql/core/src/main/scala/org/apache/spark/sql/execution/DataSourceScanExec.scala
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 @@ -381,7 +381,7 @@ case class FileSourceScanExec(
       fsRelation: HadoopFsRelation): RDD[InternalRow] = {
     logInfo(s"Planning with ${bucketSpec.numBuckets} buckets")
     val filesGroupedToBuckets =
-      selectedPartitions.flatMap { p =>
+      selectedPartitions.toArray.flatMap { p =>
 
 Review comment:
   Ah, although I thought `toArray.flatMap` was a kind of optimization. 
However, I cannot find `toArray.flatMap` in any other place.   
   It looks good to keep the original code.

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