Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/14106#discussion_r70584778
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -165,36 +165,48 @@ object PushProjectThroughSample extends
Rule[LogicalPlan] {
* but can also benefit other operators.
*/
object RemoveAliasOnlyProject extends Rule[LogicalPlan] {
- // Check if projectList in the Project node has the same attribute names
and ordering
- // as its child node.
+ /**
+ * Returns true if the project list is semantically same with child
output, after strip alias on
--- End diff --
Nit: "... same with ..." => "... same as ..."
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