Re: [PR] [WIP][SPARK-50892][SQL]Add UnionLoopExec, physical operator for recursion, to perform execution of recursive queries [spark]

["Pajaraja (via GitHub)" <gi...@apache.org>]

Pajaraja commented on code in PR #49955:
URL: https://github.com/apache/spark/pull/49955#discussion_r1979639801


##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala:
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@@ -1031,6 +1040,9 @@ object ColumnPruning extends Rule[LogicalPlan] {
       } else {
         p
       }
+    // TODO: Pruning `UnionLoop`s needs to take into account both the outer `Project` and the inner
+    //  `UnionLoopRef` nodes.

Review Comment:
   Added!



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