cloud-fan commented on code in PR #50402:
URL: https://github.com/apache/spark/pull/50402#discussion_r2056359712
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sql/core/src/main/scala/org/apache/spark/sql/execution/UnionLoopExec.scala:
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@@ -149,6 +156,33 @@ case class UnionLoopExec(
val numPartitions = prevDF.queryExecution.toRdd.partitions.length
// Main loop for obtaining the result of the recursive query.
while (prevCount > 0 && !limitReached) {
+ var prevPlan: LogicalPlan = null
+ // the current plan is created by substituting UnionLoopRef node with
the project node of
+ // the previous plan.
+ // This way we support only UNION ALL case. Additional case should be
added for UNION case.
+ // One way of supporting UNION case can be seen at SPARK-24497 PR from
Peter Toth.
+ val newRecursion = recursion.transform {
+ case r: UnionLoopRef if r.loopId == loopId =>
+ prevDF.queryExecution.optimizedPlan match {
+ case l: LocalRelation =>
+ prevPlan = prevDF.queryExecution.optimizedPlan
+ l.copy(output = r.output)
+ case p @ Project(projectList, _: OneRowRelation) =>
+ prevPlan = prevDF.queryExecution.optimizedPlan
Review Comment:
```suggestion
prevPlan = p
```
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