Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/11599#discussion_r55472012
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/ColumnPruningSuite.scala
---
@@ -157,6 +157,14 @@ class ColumnPruningSuite extends PlanTest {
comparePlans(Optimize.execute(query), expected)
}
+ test("Eliminate the Project with an empty projectList") {
+ val input = OneRowRelation
+ val query =
+ Project(Literal(1).as("1") :: Nil, Project(Literal(1).as("1") ::
Nil, input)).analyze
--- End diff --
When running `Optimize.execute(query)`, the second Project's `projectList`
is pruned to empty at first. Then, the second Project will be removed.
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