Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/10678#discussion_r50155629
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -521,38 +524,138 @@ class Analyzer(
*/
object ResolveSortReferences extends Rule[LogicalPlan] {
def apply(plan: LogicalPlan): LogicalPlan = plan resolveOperators {
- case s @ Sort(ordering, global, p @ Project(projectList, child))
- if !s.resolved && p.resolved =>
- val (newOrdering, missing) = resolveAndFindMissing(ordering, p,
child)
+ case s @ Sort(_, _, child) if !s.resolved && child.resolved =>
+ val (newOrdering, missingResolvableAttrs) =
+ collectResolvableMissingAttrs(s.order, plans =
mutable.Queue(child))
- // If this rule was not a no-op, return the transformed plan,
otherwise return the original.
- if (missing.nonEmpty) {
- // Add missing attributes and then project them away after the
sort.
- Project(p.output,
- Sort(newOrdering, global,
- Project(projectList ++ missing, child)))
- } else {
- logDebug(s"Failed to find $missing in ${p.output.mkString(",
")}")
+ if (missingResolvableAttrs.isEmpty) {
+ val unresolvableAttrs = s.order.filterNot(_.resolved)
+ logDebug(s"Failed to find $unresolvableAttrs in
${child.output.mkString(", ")}")
s // Nothing we can do here. Return original plan.
}
+ else {
+ // Transform the whole tree in post-order. Add into the self's
outputSet
+ // all the children attributes that are part of
missingResolvableAttrs.
+ // Assumption: all the conflicting attributes between left and
right have been resolved
+ val newChild = child transformUp {
+ case p: Project =>
+ p.copy(projectList = p.projectList ++
+ findNotResolvedMissingAttrs(p.outputSet, p.inputSet,
missingResolvableAttrs))
+ case w: Window =>
+ w.copy(projectList = w.projectList ++
+ findNotResolvedMissingAttrs(w.outputSet, w.inputSet,
missingResolvableAttrs))
+ case a: Aggregate =>
+ val newAggregateExpressions = a.aggregateExpressions ++
+ findNotResolvedMissingAttrs(
+ a.aggregateExpressions, a.inputSet,
missingResolvableAttrs)
+ a.copy(aggregateExpressions = newAggregateExpressions)
+ case o => o
+ }
+
+ // Add missing attributes and then project them away after the
sort.
+ Project(child.output,
+ Sort(newOrdering, s.global, newChild))
+ }
+ }
+
+ private def findNotResolvedMissingAttrs(
+ outputSet: AttributeSet,
+ inputSet: AttributeSet,
+ missingAttrs: Seq[Attribute]): Seq[Attribute] = {
+ val resolvedAttrs =
+ missingAttrs.filter(attr =>
inputSet.exists(_.semanticEquals(attr)))
+ resolvedAttrs.filterNot(attr =>
outputSet.exists(_.semanticEquals(attr)))
--- End diff --
I see. Once we agreed that we don't need to support Join, we can do that.
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