Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/17708#discussion_r112511878
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicLogicalOperators.scala
---
@@ -387,6 +387,13 @@ case class BroadcastHint(child: LogicalPlan) extends
UnaryNode {
}
/**
+ * A hint for the optimizer that we should not merge two projections.
+ */
+case class NoCollapseHint(child: LogicalPlan) extends UnaryNode {
--- End diff --
The problem with this approach is that most other optimizations won't work
with this, for example predicate push down.
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