Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/19364#discussion_r141784391
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/exchange/ExchangeCoordinator.scala
---
@@ -232,7 +232,7 @@ class ExchangeCoordinator(
// number of post-shuffle partitions.
val partitionStartIndices =
if (mapOutputStatistics.length == 0) {
- None
+ Some(Array[Int]())
--- End diff --
I meant;
```
val partitionStartIndices =
if (mapOutputStatistics.length == 0) {
Array.empty[Int]
} else {
estimatePartitionStartIndices(mapOutputStatistics)
}
...
exchange.preparePostShuffleRDD(shuffleDependencies(k),
Some(partitionStartIndices))
```
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