Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/5208#discussion_r28394950
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/Exchange.scala ---
@@ -157,28 +205,61 @@ private[sql] case class AddExchange(sqlContext:
SQLContext) extends Rule[SparkPl
case Seq(a,b) => a compatibleWith b
}.exists(!_)
- // Check if the partitioning we want to ensure is the same as the
child's output
- // partitioning. If so, we do not need to add the Exchange operator.
- def addExchangeIfNecessary(partitioning: Partitioning, child:
SparkPlan): SparkPlan =
- if (child.outputPartitioning != partitioning)
Exchange(partitioning, child) else child
+ // Adds Exchange or Sort operators as required
+ def addOperatorsIfNecessary(
+ partitioning: Partitioning,
+ rowOrdering: Seq[SortOrder],
+ child: SparkPlan): SparkPlan = {
+ val needSort = rowOrdering.nonEmpty && child.outputOrdering !=
rowOrdering
+ val needsShuffle = child.outputPartitioning != partitioning
+ val canSortWithShuffle = Exchange.canSortWithShuffle(partitioning,
rowOrdering)
+
+ if (needSort && needsShuffle && canSortWithShuffle) {
+ Exchange(partitioning, rowOrdering, child)
+ } else {
+ val withShuffle = if (needsShuffle) {
+ Exchange(partitioning, Nil, child)
+ } else {
+ child
+ }
- if (meetsRequirements && compatible) {
+ val withSort = if (needSort) {
+ Sort(rowOrdering, global = false, withShuffle)
--- End diff --
Like what we do in `SparkStrategies`, use `execution.ExternalSort` when
`sqlContext.conf.externalSortEnabled` is `true`.
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