singhpk234 commented on a change in pull request #35924:
URL: https://github.com/apache/spark/pull/35924#discussion_r831779684
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/AQEUtils.scala
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@@ -57,4 +58,24 @@ object AQEUtils {
}
case _ => Some(UnspecifiedDistribution)
}
+
+ // Analyze the given plan and calculate the required ordering of this plan
w.r.t. the
+ // user-specified sort.
+ def getRequiredOrdering(p: SparkPlan): Seq[SortOrder] = p match {
+ case f: FilterExec => getRequiredOrdering(f.child)
+ case c: CollectMetricsExec => getRequiredOrdering(c.child)
+ // We do not need to care whether the sort is global or not, since the
output partitioning
+ // is ensured by requiredDistribution.
+ case s: SortExec => s.outputOrdering
+ case p: ProjectExec =>
+ val requiredOrdering = getRequiredOrdering(p.child)
+ // avoid case `df.sort(a, b).select(c)`
+ if (requiredOrdering.forall(e =>
p.projectList.exists(_.semanticEquals(e)))) {
+ requiredOrdering
Review comment:
[question] can we handle aliasing as well.
For ex : `df.sort(a, b).select(col('a').as('x'))`
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