beliefer commented on PR #46573:
URL: https://github.com/apache/spark/pull/46573#issuecomment-2111937434
For example:
```
private def canEliminateGlobalSort(plan: LogicalPlan): Boolean = plan
match {
case r: RepartitionByExpression =>
r.partitionExpressions.forall(_.deterministic)
case r: RebalancePartitions =>
r.partitionExpressions.forall(_.deterministic)
case _: Repartition => true
case _ => false
}
```
```
protected def userSpecifiedRepartition(p: LogicalPlan): Boolean = p match {
case _: Repartition => true
case r: RepartitionByExpression
if r.optNumPartitions.isDefined || r.partitionExpressions.nonEmpty =>
true
case _ => false
}
```
```
case r: logical.RepartitionByExpression =>
val shuffleOrigin = if (r.partitionExpressions.isEmpty &&
r.optNumPartitions.isEmpty) {
REBALANCE_PARTITIONS_BY_NONE
} else if (r.optNumPartitions.isEmpty) {
REPARTITION_BY_COL
} else {
REPARTITION_BY_NUM
}
exchange.ShuffleExchangeExec(
r.partitioning, planLater(r.child),
shuffleOrigin, r.optAdvisoryPartitionSize) :: Nil
case r @ logical.Repartition(numPartitions, shuffle, child) =>
if (shuffle) {
ShuffleExchangeExec(r.partitioning, planLater(child),
REPARTITION_BY_NUM) :: Nil
} else {
execution.CoalesceExec(numPartitions, planLater(child)) :: Nil
}
```
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