wangyum commented on a change in pull request #26409: [SPARK-29655][SQL] Read
bucketed tables obeys spark.sql.shuffle.partitions
URL: https://github.com/apache/spark/pull/26409#discussion_r346409955
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/exchange/EnsureRequirements.scala
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@@ -83,7 +83,19 @@ case class EnsureRequirements(conf: SQLConf) extends
Rule[SparkPlan] {
numPartitionsSet.headOption
}
- val targetNumPartitions =
requiredNumPartitions.getOrElse(childrenNumPartitions.max)
+ // Read bucketed tables always obeys numShufflePartitions because
maxNumPostShufflePartitions
+ // is usually much larger than numShufflePartitions,
+ // which causes some bucket map join lose efficacy after enabling
adaptive execution.
Review comment:
Done.
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