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https://issues.apache.org/jira/browse/SPARK-30408?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Dongjoon Hyun updated SPARK-30408:
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Component/s: (was: Optimizer)
SQL
> 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: SQL
> Affects Versions: 2.4.0, 2.4.1, 2.4.2, 2.4.3, 2.4.4
> Reporter: APeng Zhang
> Priority: Major
>
> OrderBy in sortBy clause will be removed by EliminateSorts.
> code to reproduce:
> {code:java}
> val dataset = Seq( ("a", 1, 4), ("b", 2, 5), ("b2", 2, 2), ("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]
> [b2,2,2]
> partition 2:
> [c,3,6]{code}
> The content of sortData is:
> {code:java}
> partition 0:
> [a,1,4]
> [b,2,5]
> partition 1:
> [b2,2,2]
> [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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