Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/11341#discussion_r54832817
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/ColumnPruningSuite.scala
---
@@ -249,5 +249,26 @@ class ColumnPruningSuite extends PlanTest {
comparePlans(Optimize.execute(query), expected)
}
+ test("Remove redundant Project introduced by column pruning rule") {
+ val input = LocalRelation('key.int, 'value.string)
+
+ val query =
+ Project(Seq($"x.key", $"y.key"),
--- End diff --
Hmm, maybe I shouldn't say that removing redundant Project introduced by
column pruning. It is not accurate. The Project is becoming redundant after
column pruning optimizes the plan.
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