Github user windpiger commented on a diff in the pull request:
https://github.com/apache/spark/pull/16255#discussion_r93892249
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -200,6 +200,8 @@ object RemoveAliasOnlyProject extends Rule[LogicalPlan]
{
case plan: Project if plan eq proj => plan.child
--- End diff --
sorry, describe it clearly,this is not safe?
https://github.com/windpiger/spark/blob/0413f9dad4ad1294e3400dc0f42f66529b1b055b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala#L203-L204
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