diff options
8 files changed, 18 insertions, 10 deletions
diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/SqlParser.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/SqlParser.scala index ea7d44a372..b176f7e729 100644 --- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/SqlParser.scala +++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/SqlParser.scala @@ -139,7 +139,7 @@ class SqlParser extends AbstractSparkSQLParser with DataTypeParser { sortType.? ~ (LIMIT ~> expression).? ^^ { case d ~ p ~ r ~ f ~ g ~ h ~ o ~ l => - val base = r.getOrElse(NoRelation) + val base = r.getOrElse(OneRowRelation) val withFilter = f.map(Filter(_, base)).getOrElse(base) val withProjection = g .map(Aggregate(_, assignAliases(p), withFilter)) diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicOperators.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicOperators.scala index 4d9e41a2b5..190209238a 100644 --- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicOperators.scala +++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicOperators.scala @@ -287,7 +287,10 @@ case class Distinct(child: LogicalPlan) extends UnaryNode { override def output: Seq[Attribute] = child.output } -case object NoRelation extends LeafNode { +/** + * A relation with one row. This is used in "SELECT ..." without a from clause. + */ +case object OneRowRelation extends LeafNode { override def output: Seq[Attribute] = Nil /** diff --git a/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/ExpressionOptimizationSuite.scala b/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/ExpressionOptimizationSuite.scala index ae99a3f9ba..2f3704be59 100644 --- a/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/ExpressionOptimizationSuite.scala +++ b/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/ExpressionOptimizationSuite.scala @@ -29,7 +29,7 @@ class ExpressionOptimizationSuite extends ExpressionEvaluationSuite { expression: Expression, expected: Any, inputRow: Row = EmptyRow): Unit = { - val plan = Project(Alias(expression, s"Optimized($expression)")() :: Nil, NoRelation) + val plan = Project(Alias(expression, s"Optimized($expression)")() :: Nil, OneRowRelation) val optimizedPlan = DefaultOptimizer(plan) super.checkEvaluation(optimizedPlan.expressions.head, expected, inputRow) } diff --git a/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/plans/PlanTest.scala b/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/plans/PlanTest.scala index 48884040bf..129d091ca0 100644 --- a/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/plans/PlanTest.scala +++ b/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/plans/PlanTest.scala @@ -20,7 +20,7 @@ package org.apache.spark.sql.catalyst.plans import org.scalatest.FunSuite import org.apache.spark.sql.catalyst.expressions._ -import org.apache.spark.sql.catalyst.plans.logical.{NoRelation, Filter, LogicalPlan} +import org.apache.spark.sql.catalyst.plans.logical.{OneRowRelation, Filter, LogicalPlan} import org.apache.spark.sql.catalyst.util._ /** @@ -55,6 +55,6 @@ class PlanTest extends FunSuite { /** Fails the test if the two expressions do not match */ protected def compareExpressions(e1: Expression, e2: Expression): Unit = { - comparePlans(Filter(e1, NoRelation), Filter(e2, NoRelation)) + comparePlans(Filter(e1, OneRowRelation), Filter(e2, OneRowRelation)) } } diff --git a/sql/core/src/main/scala/org/apache/spark/sql/SQLContext.scala b/sql/core/src/main/scala/org/apache/spark/sql/SQLContext.scala index e59cf9b9e0..b8100782ec 100644 --- a/sql/core/src/main/scala/org/apache/spark/sql/SQLContext.scala +++ b/sql/core/src/main/scala/org/apache/spark/sql/SQLContext.scala @@ -31,7 +31,7 @@ import org.apache.spark.rdd.RDD import org.apache.spark.sql.catalyst.analysis._ import org.apache.spark.sql.catalyst.expressions._ import org.apache.spark.sql.catalyst.optimizer.{DefaultOptimizer, Optimizer} -import org.apache.spark.sql.catalyst.plans.logical.{LocalRelation, LogicalPlan, NoRelation} +import org.apache.spark.sql.catalyst.plans.logical.{LocalRelation, LogicalPlan, OneRowRelation} import org.apache.spark.sql.catalyst.rules.RuleExecutor import org.apache.spark.sql.catalyst.{ScalaReflection, expressions} import org.apache.spark.sql.execution.{Filter, _} @@ -177,7 +177,7 @@ class SQLContext(@transient val sparkContext: SparkContext) */ @Experimental @transient - lazy val emptyDataFrame = DataFrame(this, NoRelation) + lazy val emptyDataFrame: DataFrame = createDataFrame(sparkContext.emptyRDD[Row], StructType(Nil)) /** * A collection of methods for registering user-defined functions (UDF). diff --git a/sql/core/src/main/scala/org/apache/spark/sql/execution/SparkStrategies.scala b/sql/core/src/main/scala/org/apache/spark/sql/execution/SparkStrategies.scala index 2b581152e5..f754fa770d 100644 --- a/sql/core/src/main/scala/org/apache/spark/sql/execution/SparkStrategies.scala +++ b/sql/core/src/main/scala/org/apache/spark/sql/execution/SparkStrategies.scala @@ -296,7 +296,7 @@ private[sql] abstract class SparkStrategies extends QueryPlanner[SparkPlan] { execution.Intersect(planLater(left), planLater(right)) :: Nil case logical.Generate(generator, join, outer, _, child) => execution.Generate(generator, join = join, outer = outer, planLater(child)) :: Nil - case logical.NoRelation => + case logical.OneRowRelation => execution.PhysicalRDD(Nil, singleRowRdd) :: Nil case logical.Repartition(expressions, child) => execution.Exchange(HashPartitioning(expressions, numPartitions), planLater(child)) :: Nil diff --git a/sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala b/sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala index 5f03805d70..6761d996fd 100644 --- a/sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala +++ b/sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala @@ -84,6 +84,11 @@ class DataFrameSuite extends QueryTest { testData.collect().toSeq) } + test("empty data frame") { + assert(TestSQLContext.emptyDataFrame.columns.toSeq === Seq.empty[String]) + assert(TestSQLContext.emptyDataFrame.count() === 0) + } + test("head and take") { assert(testData.take(2) === testData.collect().take(2)) assert(testData.head(2) === testData.collect().take(2)) diff --git a/sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveQl.scala b/sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveQl.scala index c45c4ad70f..cd8e7c09ee 100644 --- a/sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveQl.scala +++ b/sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveQl.scala @@ -479,7 +479,7 @@ https://cwiki.apache.org/confluence/display/Hive/Enhanced+Aggregation%2C+Cube%2C // Just fake explain for any of the native commands. case Token("TOK_EXPLAIN", explainArgs) if noExplainCommands.contains(explainArgs.head.getText) => - ExplainCommand(NoRelation) + ExplainCommand(OneRowRelation) case Token("TOK_EXPLAIN", explainArgs) if "TOK_CREATETABLE" == explainArgs.head.getText => val Some(crtTbl) :: _ :: extended :: Nil = @@ -622,7 +622,7 @@ https://cwiki.apache.org/confluence/display/Hive/Enhanced+Aggregation%2C+Cube%2C val relations = fromClause match { case Some(f) => nodeToRelation(f) - case None => NoRelation + case None => OneRowRelation } val withWhere = whereClause.map { whereNode => |