cloud-fan commented on pull request #28916: URL: https://github.com/apache/spark/pull/28916#issuecomment-651527077
I think the key problem is we skip `CoalesceShufflePartitions` when `ShuffleQueryStageExec#mapStats` is None. This can happen when the input RDD of the shuffle has 0 partitions. I think we should still apply `CoalesceShufflePartitions` in this case and wrap `ShuffleQueryStageExec` with `CustomShuffleReaderExec` with `partitionSpecs` as Nil. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org
