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[SPARK-7267][SQL]Push down Project when it's child is Limit #5797

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[SPARK-7267][SQL]Push down Project when it's child is Limit #5797

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c3f046f
Merge pull request #1 from apache/master
pzzs Mar 2, 2015
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Merge pull request #2 from apache/master
pzzs Mar 5, 2015
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Merge pull request #3 from apache/master
pzzs Mar 10, 2015
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Merge pull request #4 from apache/master
pzzs Mar 12, 2015
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Merge pull request #5 from apache/master
pzzs Mar 19, 2015
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Merge pull request #6 from apache/master
pzzs Mar 24, 2015
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Merge pull request #7 from apache/master
pzzs Mar 26, 2015
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Merge pull request #8 from apache/master
pzzs Apr 8, 2015
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Merge pull request #9 from apache/master
pzzs Apr 17, 2015
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Merge pull request #10 from apache/master
pzzs Apr 21, 2015
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Merge pull request #12 from apache/master
pzzs Apr 29, 2015
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Update Optimizer.scala
pzzs Apr 29, 2015
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Update FilterPushdownSuite.scala
pzzs Apr 30, 2015
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Update FilterPushdownSuite.scala
pzzs Apr 30, 2015
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3 changes: 3 additions & 0 deletions sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -171,6 +171,9 @@ object ColumnPruning extends Rule[LogicalPlan] {

Project(substitutedProjection, child)

case Project(projectList, Limit(exp, child)) =>
Limit(exp, Project(projectList, child))

// Eliminate no-op Projects
case Project(projectList, child) if child.output == projectList => child
}
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16 changes: 16 additions & 0 deletions ...catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/FilterPushdownSuite.scala
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Expand Up @@ -90,7 +90,23 @@ class FilterPushdownSuite extends PlanTest {

comparePlans(optimized, correctAnswer)
}

test("column pruning for Project(ne, Limit)") {
val originalQuery =
testRelation
.select('a,'b)
.limit(2)
.select('a)

val optimized = Optimize.execute(originalQuery.analyze)
val correctAnswer =
testRelation
.select('a)
.limit(2).analyze

comparePlans(optimized, correctAnswer)
}

// After this line is unimplemented.
test("simple push down") {
val originalQuery =
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