Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/16933#discussion_r101911156
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/CollapseRepartitionSuite.scala
---
@@ -43,15 +55,44 @@ class CollapseRepartitionSuite extends PlanTest {
comparePlans(optimized, correctAnswer)
}
+ test("collapse one coalesce and one repartition into one") {
+ val query1 = testRelation
+ .coalesce(20)
+ .repartition(5)
+
+ val optimized1 = Optimize.execute(query1.analyze)
+ val correctAnswer1 = testRelation.repartition(5).analyze
+
+ comparePlans(optimized1, correctAnswer1)
+
+ val query2 = testRelation
+ .repartition(5)
+ .coalesce(20)
+
+ val optimized2 = Optimize.execute(query2.analyze)
+ val correctAnswer2 = testRelation.repartition(5).coalesce(20).analyze
--- End diff --
For improving this rule, we need to clean up the resolution of
RepartitionByExpression at first.
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