Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/18654#discussion_r127722734
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/FileFormatWriter.scala
---
@@ -236,7 +236,10 @@ object FileFormatWriter extends Logging {
committer.setupTask(taskAttemptContext)
val writeTask =
- if (description.partitionColumns.isEmpty &&
description.bucketIdExpression.isEmpty) {
+ if (sparkPartitionId != 0 && !iterator.hasNext) {
--- End diff --
I guess this might be okay in that sense we are guaranteed partitions to be
started from 0 up to my knowledge. Could you take a look and see if it makes
sense to you cc @cloud-fan if you don't mind? I am not confident enough to
proceed reviewing and leave a sign-off.
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