diff options
2 files changed, 19 insertions, 0 deletions
diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala index 485761dd85..63669e970b 100644 --- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala +++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala @@ -170,6 +170,9 @@ 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 } diff --git a/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/FilterPushdownSuite.scala b/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/FilterPushdownSuite.scala index aa9708b164..2ad73941ab 100644 --- a/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/FilterPushdownSuite.scala +++ b/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/FilterPushdownSuite.scala @@ -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 = |