cloud-fan commented on a change in pull request #28916:
URL: https://github.com/apache/spark/pull/28916#discussion_r444768751
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/ShufflePartitionsUtil.scala
##########
@@ -92,9 +92,10 @@ object ShufflePartitionsUtil extends Logging {
var coalescedSize = 0L
var i = 0
- def createPartitionSpec(): Unit = {
- // Skip empty inputs, as it is a waste to launch an empty task.
- if (coalescedSize > 0) {
+ def createPartitionSpec(last: Boolean = false): Unit = {
+ // Skip empty inputs, as it is a waste to launch an empty task
+ // unless all inputs are empty
+ if (coalescedSize > 0 || (last && partitionSpecs.isEmpty)) {
Review comment:
so you want to create at lease one partition? This doesn't match the PR
description.
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/ShufflePartitionsUtil.scala
##########
@@ -92,9 +92,10 @@ object ShufflePartitionsUtil extends Logging {
var coalescedSize = 0L
var i = 0
- def createPartitionSpec(): Unit = {
- // Skip empty inputs, as it is a waste to launch an empty task.
- if (coalescedSize > 0) {
+ def createPartitionSpec(last: Boolean = false): Unit = {
+ // Skip empty inputs, as it is a waste to launch an empty task
+ // unless all inputs are empty
+ if (coalescedSize > 0 || (last && partitionSpecs.isEmpty)) {
Review comment:
so you want to create at least one partition? This doesn't match the PR
description.
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