sigmod commented on a change in pull request #35574:
URL: https://github.com/apache/spark/pull/35574#discussion_r812440122
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/exchange/EnsureRequirements.scala
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@@ -56,7 +57,23 @@ case class EnsureRequirements(
// Ensure that the operator's children satisfy their output distribution
requirements.
var children = originalChildren.zip(requiredChildDistributions).map {
case (child, distribution) if
child.outputPartitioning.satisfies(distribution) =>
- child
+ (child.outputPartitioning, distribution) match {
+ case (p: HashPartitioning, d: ClusteredDistribution) =>
+ if
(conf.getConf(SQLConf.REQUIRE_ALL_CLUSTER_KEYS_FOR_SOLE_PARTITION) &&
+ requiredChildDistributions.size == 1 &&
!p.isPartitionedOnFullKeys(d)) {
+ // Add an extra shuffle for `ClusteredDistribution` even though
its child
Review comment:
Thanks, @c21!
It's probably discussed in the another comment thread. But I'd like to
reiterate that although currently it's a global config per a query, the
examples I mentioned show that it's a physical plan alternative that shouldn't
be ignored by default.
The planner eventually probably wants to make a more automatic decision
between HashClusteredDistribution and ClusteredDistribution at each operator
level (at least, when stats are available). By that time, we will still need to
bring `HashClusteredDistribution` back anyway, regardless how it is named and
where the dispatch goes (a dedicated class or a bool field in
ClusteredDistribution).
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