Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/15857#discussion_r87743162
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala
---
@@ -449,7 +452,7 @@ object FoldablePropagation extends Rule[LogicalPlan] {
stop = true
j
- // These 3 operators take attributes as constructor parameters,
and these attributes
+ // These 4 operators take attributes as constructor parameters,
and these attributes
--- End diff --
shall we turn to whitelist? As I remember there have been more than 3 bugs
reported on this optimizer rule.
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