Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/16933#discussion_r104772991 --- Diff: sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/CollapseRepartitionSuite.scala --- @@ -32,47 +32,180 @@ class CollapseRepartitionSuite extends PlanTest { val testRelation = LocalRelation('a.int, 'b.int) + + test("collapse two adjacent coalesces into one") { + // Always respects the top coalesces amd removes useless coalesce below coalesce + val query1 = testRelation + .coalesce(10) + .coalesce(20) + val query2 = testRelation + .coalesce(30) + .coalesce(20) + + val optimized1 = Optimize.execute(query1.analyze) + val optimized2 = Optimize.execute(query2.analyze) + + val correctAnswer = testRelation.coalesce(20).analyze + + comparePlans(optimized1, correctAnswer) + comparePlans(optimized2, correctAnswer) + } + test("collapse two adjacent repartitions into one") { - val query = testRelation + // Always respects the top repartition amd removes useless repartition below repartition + val query1 = testRelation + .repartition(10) + .repartition(20) + val query2 = testRelation + .repartition(30) + .repartition(20) + + val optimized1 = Optimize.execute(query1.analyze) + val optimized2 = Optimize.execute(query2.analyze) + val correctAnswer = testRelation.repartition(20).analyze + + comparePlans(optimized1, correctAnswer) + comparePlans(optimized2, correctAnswer) + } + + test("coalesce above repartition") { + // Remove useless coalesce above repartition + val query1 = testRelation .repartition(10) + .coalesce(20) + + val optimized1 = Optimize.execute(query1.analyze) + val correctAnswer1 = testRelation.repartition(10).analyze + + comparePlans(optimized1, correctAnswer1) + + // No change in this case + val query2 = testRelation + .repartition(30) + .coalesce(20) + + val optimized2 = Optimize.execute(query2.analyze) + val correctAnswer2 = query2.analyze + + comparePlans(optimized2, correctAnswer2) + } + + test("repartition above coalesce") { + // Always respects the top repartition amd removes useless coalesce below repartition + val query1 = testRelation + .coalesce(10) + .repartition(20) + // Remove useless coalesce above repartition + val query2 = testRelation + .coalesce(30) .repartition(20) - val optimized = Optimize.execute(query.analyze) + val optimized1 = Optimize.execute(query1.analyze) + val optimized2 = Optimize.execute(query2.analyze) + val correctAnswer = testRelation.repartition(20).analyze - comparePlans(optimized, correctAnswer) + comparePlans(optimized1, correctAnswer) + comparePlans(optimized2, correctAnswer) } - test("collapse repartition and repartitionBy into one") { - val query = testRelation + test("repartitionBy above repartition") { + val query1 = testRelation .repartition(10) .distribute('a)(20) - val optimized = Optimize.execute(query.analyze) - val correctAnswer = testRelation.distribute('a)(20).analyze + val optimized1 = Optimize.execute(query1.analyze) + val correctAnswer1 = testRelation.distribute('a)(20).analyze + + comparePlans(optimized1, correctAnswer1) + + val query2 = testRelation + .repartition(30) + .distribute('a)(20) + + val optimized2 = Optimize.execute(query2.analyze) + val correctAnswer2 = testRelation.distribute('a)(20).analyze - comparePlans(optimized, correctAnswer) + comparePlans(optimized2, correctAnswer2) } - test("collapse repartitionBy and repartition into one") { - val query = testRelation + test("repartitionBy above coalesce") { + val query1 = testRelation + .coalesce(10) + .distribute('a)(20) + + val optimized1 = Optimize.execute(query1.analyze) + val correctAnswer1 = testRelation.distribute('a)(20).analyze + + comparePlans(optimized1, correctAnswer1) + + val query2 = testRelation + .coalesce(20) + .distribute('a)(30) + + val optimized2 = Optimize.execute(query2.analyze) + val correctAnswer2 = testRelation.distribute('a)(30).analyze + + comparePlans(optimized2, correctAnswer2) + } + + test("repartition above repartitionBy") { + val query1 = testRelation .distribute('a)(20) .repartition(10) - val optimized = Optimize.execute(query.analyze) - val correctAnswer = testRelation.distribute('a)(10).analyze + val optimized1 = Optimize.execute(query1.analyze) + val correctAnswer1 = testRelation.distribute('a)(10).analyze --- End diff -- I not quite sure about this. Shall we optimize to `relation.repartition(10)`?
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