[jira] [Created] (SPARK-30408) orderBy in sortBy clause is removed by EliminateSorts

["APeng Zhang (Jira)" <ji...@apache.org>]

APeng Zhang created SPARK-30408:
-----------------------------------

             Summary: orderBy in sortBy clause is removed by EliminateSorts
                 Key: SPARK-30408
                 URL: https://issues.apache.org/jira/browse/SPARK-30408
             Project: Spark
          Issue Type: Bug
          Components: Optimizer
    Affects Versions: 2.4.4, 2.4.3, 2.4.2, 2.4.1, 2.4.0
            Reporter: APeng Zhang


OrderBy in sortBy clause will be removed by EliminateSorts.

code to reproduce:

 
{code:java}
val dataset = Seq( ("a", 1, 4), ("b", 2, 5), ("c", 3, 6) ).toDF("a", "b", "c") 
val groupData = dataset.orderBy("b")
val sortData = groupData.sortWithinPartitions("c")
{code}
The content of groupData is:
{code:java}
partition 0: 
    [a,1,4]
partition 1: 
    [b,2,5]
partition 2: 
    [c,3,6]{code}
The content of sortData is:
{code:java}
partition 0: 
    [a,1,4]
partition 1: 
    [b,2,5], 
    [c,3,6]{code}
 

UT to cover this defect:

In EliminateSortsSuite.scala
{code:java}
test("should not remove orderBy in sortBy clause") {
  val plan = testRelation.orderBy('a.asc).sortBy('b.desc)
  val optimized = Optimize.execute(plan.analyze)
  val correctAnswer = testRelation.orderBy('a.asc).sortBy('b.desc).analyze
  comparePlans(optimized, correctAnswer)
}{code}
 

 
This test will be failed because sortBy was removed by EliminateSorts.



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