[SPARK-23207][SQL][FOLLOW-UP] Don't perform local sort for DataFrame.repartition(1) #20426
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Test build #86778 has finished for PR 20426 at commit
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Test build #86785 has finished for PR 20426 at commit
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LGTM, merging to master/2.3! |
asfgit
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Jan 30, 2018
…repartition(1) ## What changes were proposed in this pull request? In `ShuffleExchangeExec`, we don't need to insert extra local sort before round-robin partitioning, if the new partitioning has only 1 partition, because under that case all output rows go to the same partition. ## How was this patch tested? The existing test cases. Author: Xingbo Jiang <xingbo.jiang@databricks.com> Closes #20426 from jiangxb1987/repartition1. (cherry picked from commit b375397) Signed-off-by: Wenchen Fan <wenchen@databricks.com>
bersprockets
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Aug 13, 2018
…repartition(1) In `ShuffleExchangeExec`, we don't need to insert extra local sort before round-robin partitioning, if the new partitioning has only 1 partition, because under that case all output rows go to the same partition. The existing test cases. Author: Xingbo Jiang <xingbo.jiang@databricks.com> Closes apache#20426 from jiangxb1987/repartition1.
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What changes were proposed in this pull request?
In
ShuffleExchangeExec, we don't need to insert extra local sort before round-robin partitioning, if the new partitioning has only 1 partition, because under that case all output rows go to the same partition.How was this patch tested?
The existing test cases.