peter-toth commented on code in PR #55876:
URL: https://github.com/apache/spark/pull/55876#discussion_r3249332921
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sql/core/src/main/scala/org/apache/spark/sql/execution/AliasAwareOutputExpression.scala:
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@@ -94,6 +94,16 @@ trait PartitioningPreservingUnaryExecNode extends
UnaryExecNode
kps: Seq[KeyedPartitioning]): LazyList[KeyedPartitioning] = {
if (kps.isEmpty) return LazyList.empty
val numPositions = kps.head.expressions.length
+ // The function assumes all input KPs share the same `partitionKeys`,
which implies matching
+ // expression arity. This invariant is asserted by [[GroupPartitionsExec]]
and is established
+ // by the constructors of [[PartitioningCollection]] feeding this method
(a join's
+ // `PartitioningCollection(left.outputPartitioning,
right.outputPartitioning)` combines KPs
+ // that have been aligned by [[EnsureRequirements]] to the same join
keys). If the invariant
+ // is ever violated upstream, fail early with a clear message instead of
throwing an opaque
+ // `IndexOutOfBoundsException` from `kp.expressions(i)` below.
+ assert(kps.forall(_.expressions.length == numPositions),
Review Comment:
@cloud-fan, I wonder if we could enforce this invariant in
`PartitioningCollection`: https://github.com/apache/spark/pull/55901
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