Class

org.apache.spark.sql.execution

SampleExec

Related Doc: package execution

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case class SampleExec(lowerBound: Double, upperBound: Double, withReplacement: Boolean, seed: Long, child: SparkPlan) extends SparkPlan with UnaryExecNode with CodegenSupport with Product with Serializable

Physical plan for sampling the dataset.

lowerBound

Lower-bound of the sampling probability (usually 0.0)

upperBound

Upper-bound of the sampling probability. The expected fraction sampled will be ub - lb.

withReplacement

Whether to sample with replacement.

seed

the random seed

child

the SparkPlan

Linear Supertypes
CodegenSupport, UnaryExecNode, SparkPlan, Serializable, Serializable, Logging, QueryPlan[SparkPlan], TreeNode[SparkPlan], Product, Equals, AnyRef, Any
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Inherited
  1. SampleExec
  2. CodegenSupport
  3. UnaryExecNode
  4. SparkPlan
  5. Serializable
  6. Serializable
  7. Logging
  8. QueryPlan
  9. TreeNode
  10. Product
  11. Equals
  12. AnyRef
  13. Any
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Visibility
  1. Public
  2. All

Instance Constructors

  1. new SampleExec(lowerBound: Double, upperBound: Double, withReplacement: Boolean, seed: Long, child: SparkPlan)

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    lowerBound

    Lower-bound of the sampling probability (usually 0.0)

    upperBound

    Upper-bound of the sampling probability. The expected fraction sampled will be ub - lb.

    withReplacement

    Whether to sample with replacement.

    seed

    the random seed

    child

    the SparkPlan

Value Members

  1. final def !=(arg0: Any): Boolean

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    Definition Classes
    AnyRef → Any
  2. final def ##(): Int

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    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean

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    Definition Classes
    AnyRef → Any
  4. lazy val allAttributes: AttributeSeq

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    Definition Classes
    QueryPlan
  5. def apply(number: Int): TreeNode[_]

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    Definition Classes
    TreeNode
  6. def argString: String

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    Definition Classes
    TreeNode
  7. def asCode: String

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    Definition Classes
    TreeNode
  8. final def asInstanceOf[T0]: T0

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    Definition Classes
    Any
  9. lazy val canonicalized: SparkPlan

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    Definition Classes
    QueryPlan
  10. val child: SparkPlan

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    the SparkPlan

    the SparkPlan

    Definition Classes
    SampleExecUnaryExecNode
  11. final def children: Seq[SparkPlan]

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    Definition Classes
    UnaryExecNode → TreeNode
  12. def clone(): AnyRef

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    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  13. def collect[B](pf: PartialFunction[SparkPlan, B]): Seq[B]

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    Definition Classes
    TreeNode
  14. def collectFirst[B](pf: PartialFunction[SparkPlan, B]): Option[B]

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    Definition Classes
    TreeNode
  15. def collectLeaves(): Seq[SparkPlan]

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    Definition Classes
    TreeNode
  16. lazy val constraints: ExpressionSet

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    Definition Classes
    QueryPlan
  17. final def consume(ctx: CodegenContext, outputVars: Seq[ExprCode], row: String = null): String

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    Consume the generated columns or row from current SparkPlan, call its parent's doConsume().

    Consume the generated columns or row from current SparkPlan, call its parent's doConsume().

    Definition Classes
    CodegenSupport
  18. lazy val containsChild: Set[TreeNode[_]]

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    Definition Classes
    TreeNode
  19. def doConsume(ctx: CodegenContext, input: Seq[ExprCode], row: ExprCode): String

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    Generate the Java source code to process the rows from child SparkPlan.

    Generate the Java source code to process the rows from child SparkPlan.

    This should be override by subclass to support codegen.

    For example, Filter will generate the code like this:

    # code to evaluate the predicate expression, result is isNull1 and value2 if (isNull1 || !value2) continue; # call consume(), which will call parent.doConsume()

    Note: A plan can either consume the rows as UnsafeRow (row), or a list of variables (input).

    Definition Classes
    SampleExecCodegenSupport
  20. def doExecute(): RDD[InternalRow]

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    Overridden by concrete implementations of SparkPlan.

    Overridden by concrete implementations of SparkPlan. Produces the result of the query as an RDD[InternalRow]

    Attributes
    protected
    Definition Classes
    SampleExecSparkPlan
  21. def doExecuteBroadcast[T](): Broadcast[T]

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    Overridden by concrete implementations of SparkPlan.

    Overridden by concrete implementations of SparkPlan. Produces the result of the query as a broadcast variable.

    Attributes
    protected[org.apache.spark.sql]
    Definition Classes
    SparkPlan
  22. def doPrepare(): Unit

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    Overridden by concrete implementations of SparkPlan.

    Overridden by concrete implementations of SparkPlan. It is guaranteed to run before any execute of SparkPlan. This is helpful if we want to set up some state before executing the query, e.g., BroadcastHashJoin uses it to broadcast asynchronously.

    Note: the prepare method has already walked down the tree, so the implementation doesn't need to call children's prepare methods.

    This will only be called once, protected by this.

    Attributes
    protected
    Definition Classes
    SparkPlan
  23. def doProduce(ctx: CodegenContext): String

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    Generate the Java source code to process, should be overridden by subclass to support codegen.

    Generate the Java source code to process, should be overridden by subclass to support codegen.

    doProduce() usually generate the framework, for example, aggregation could generate this:

    if (!initialized) { # create a hash map, then build the aggregation hash map # call child.produce() initialized = true; } while (hashmap.hasNext()) { row = hashmap.next(); # build the aggregation results # create variables for results # call consume(), which will call parent.doConsume() if (shouldStop()) return; }

    Attributes
    protected
    Definition Classes
    SampleExecCodegenSupport
  24. final def eq(arg0: AnyRef): Boolean

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    Definition Classes
    AnyRef
  25. def evaluateRequiredVariables(attributes: Seq[Attribute], variables: Seq[ExprCode], required: AttributeSet): String

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    Returns source code to evaluate the variables for required attributes, and clear the code of evaluated variables, to prevent them to be evaluated twice.

    Returns source code to evaluate the variables for required attributes, and clear the code of evaluated variables, to prevent them to be evaluated twice.

    Attributes
    protected
    Definition Classes
    CodegenSupport
  26. def evaluateVariables(variables: Seq[ExprCode]): String

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    Returns source code to evaluate all the variables, and clear the code of them, to prevent them to be evaluated twice.

    Returns source code to evaluate all the variables, and clear the code of them, to prevent them to be evaluated twice.

    Attributes
    protected
    Definition Classes
    CodegenSupport
  27. final def execute(): RDD[InternalRow]

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    Returns the result of this query as an RDD[InternalRow] by delegating to doExecute after preparations.

    Returns the result of this query as an RDD[InternalRow] by delegating to doExecute after preparations.

    Concrete implementations of SparkPlan should override doExecute.

    Definition Classes
    SparkPlan
  28. final def executeBroadcast[T](): Broadcast[T]

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    Returns the result of this query as a broadcast variable by delegating to doExecuteBroadcast after preparations.

    Returns the result of this query as a broadcast variable by delegating to doExecuteBroadcast after preparations.

    Concrete implementations of SparkPlan should override doExecuteBroadcast.

    Definition Classes
    SparkPlan
  29. def executeCollect(): Array[InternalRow]

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    Runs this query returning the result as an array.

    Runs this query returning the result as an array.

    Definition Classes
    SparkPlan
  30. def executeCollectPublic(): Array[Row]

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    Runs this query returning the result as an array, using external Row format.

    Runs this query returning the result as an array, using external Row format.

    Definition Classes
    SparkPlan
  31. final def executeQuery[T](query: ⇒ T): T

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    Execute a query after preparing the query and adding query plan information to created RDDs for visualization.

    Execute a query after preparing the query and adding query plan information to created RDDs for visualization.

    Attributes
    protected
    Definition Classes
    SparkPlan
  32. def executeTake(n: Int): Array[InternalRow]

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    Runs this query returning the first n rows as an array.

    Runs this query returning the first n rows as an array.

    This is modeled after RDD.take but never runs any job locally on the driver.

    Definition Classes
    SparkPlan
  33. def executeToIterator(): Iterator[InternalRow]

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    Runs this query returning the result as an iterator of InternalRow.

    Runs this query returning the result as an iterator of InternalRow.

    Note: this will trigger multiple jobs (one for each partition).

    Definition Classes
    SparkPlan
  34. final def expressions: Seq[Expression]

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    Definition Classes
    QueryPlan
  35. def fastEquals(other: TreeNode[_]): Boolean

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    Definition Classes
    TreeNode
  36. def finalize(): Unit

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    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  37. def find(f: (SparkPlan) ⇒ Boolean): Option[SparkPlan]

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    Definition Classes
    TreeNode
  38. def flatMap[A](f: (SparkPlan) ⇒ TraversableOnce[A]): Seq[A]

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    Definition Classes
    TreeNode
  39. def foreach(f: (SparkPlan) ⇒ Unit): Unit

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    Definition Classes
    TreeNode
  40. def foreachUp(f: (SparkPlan) ⇒ Unit): Unit

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    Definition Classes
    TreeNode
  41. def generateTreeString(depth: Int, lastChildren: Seq[Boolean], builder: StringBuilder, verbose: Boolean, prefix: String, addSuffix: Boolean): StringBuilder

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    Definition Classes
    TreeNode
  42. final def getClass(): Class[_]

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    Definition Classes
    AnyRef → Any
  43. def getRelevantConstraints(constraints: Set[Expression]): Set[Expression]

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    Attributes
    protected
    Definition Classes
    QueryPlan
  44. def hashCode(): Int

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    Definition Classes
    TreeNode → AnyRef → Any
  45. def initializeLogIfNecessary(isInterpreter: Boolean): Unit

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    Attributes
    protected
    Definition Classes
    Logging
  46. def innerChildren: Seq[QueryPlan[_]]

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    Attributes
    protected
    Definition Classes
    QueryPlan → TreeNode
  47. def inputRDDs(): Seq[RDD[InternalRow]]

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    Returns all the RDDs of InternalRow which generates the input rows.

    Returns all the RDDs of InternalRow which generates the input rows.

    Note: right now we support up to two RDDs.

    Definition Classes
    SampleExecCodegenSupport
  48. def inputSet: AttributeSet

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    Definition Classes
    QueryPlan
  49. final def isInstanceOf[T0]: Boolean

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    Definition Classes
    Any
  50. def isShouldStopRequired: Boolean

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    For optimization to suppress shouldStop() in a loop of WholeStageCodegen.

    For optimization to suppress shouldStop() in a loop of WholeStageCodegen. Returning true means we need to insert shouldStop() into the loop producing rows, if any.

    Definition Classes
    CodegenSupport
  51. def isTraceEnabled(): Boolean

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    Attributes
    protected
    Definition Classes
    Logging
  52. def jsonFields: List[JField]

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    Attributes
    protected
    Definition Classes
    TreeNode
  53. def log: Logger

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    Attributes
    protected
    Definition Classes
    Logging
  54. def logDebug(msg: ⇒ String, throwable: Throwable): Unit

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    Attributes
    protected
    Definition Classes
    Logging
  55. def logDebug(msg: ⇒ String): Unit

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    Attributes
    protected
    Definition Classes
    Logging
  56. def logError(msg: ⇒ String, throwable: Throwable): Unit

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    Attributes
    protected
    Definition Classes
    Logging
  57. def logError(msg: ⇒ String): Unit

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    Attributes
    protected
    Definition Classes
    Logging
  58. def logInfo(msg: ⇒ String, throwable: Throwable): Unit

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    Attributes
    protected
    Definition Classes
    Logging
  59. def logInfo(msg: ⇒ String): Unit

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    Attributes
    protected
    Definition Classes
    Logging
  60. def logName: String

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    Attributes
    protected
    Definition Classes
    Logging
  61. def logTrace(msg: ⇒ String, throwable: Throwable): Unit

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    Attributes
    protected
    Definition Classes
    Logging
  62. def logTrace(msg: ⇒ String): Unit

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    Attributes
    protected
    Definition Classes
    Logging
  63. def logWarning(msg: ⇒ String, throwable: Throwable): Unit

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    Attributes
    protected
    Definition Classes
    Logging
  64. def logWarning(msg: ⇒ String): Unit

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    Attributes
    protected
    Definition Classes
    Logging
  65. def longMetric(name: String): SQLMetric

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    Return a LongSQLMetric according to the name.

    Return a LongSQLMetric according to the name.

    Definition Classes
    SparkPlan
  66. val lowerBound: Double

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    Lower-bound of the sampling probability (usually 0.0)

  67. def makeCopy(newArgs: Array[AnyRef]): SparkPlan

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    Overridden make copy also propagates sqlContext to copied plan.

    Overridden make copy also propagates sqlContext to copied plan.

    Definition Classes
    SparkPlan → TreeNode
  68. def map[A](f: (SparkPlan) ⇒ A): Seq[A]

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    Definition Classes
    TreeNode
  69. def mapChildren(f: (SparkPlan) ⇒ SparkPlan): SparkPlan

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    Definition Classes
    TreeNode
  70. def mapExpressions(f: (Expression) ⇒ Expression): SampleExec.this.type

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    Definition Classes
    QueryPlan
  71. def mapProductIterator[B](f: (Any) ⇒ B)(implicit arg0: ClassTag[B]): Array[B]

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    Attributes
    protected
    Definition Classes
    TreeNode
  72. def metadata: Map[String, String]

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    Return all metadata that describes more details of this SparkPlan.

    Return all metadata that describes more details of this SparkPlan.

    Definition Classes
    SparkPlan
  73. def metricTerm(ctx: CodegenContext, name: String): String

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    Creates a metric using the specified name.

    Creates a metric using the specified name.

    returns

    name of the variable representing the metric

    Definition Classes
    CodegenSupport
  74. lazy val metrics: Map[String, SQLMetric]

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    Return all metrics containing metrics of this SparkPlan.

    Return all metrics containing metrics of this SparkPlan.

    Definition Classes
    SampleExecSparkPlan
  75. def missingInput: AttributeSet

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    Definition Classes
    QueryPlan
  76. final def ne(arg0: AnyRef): Boolean

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    Definition Classes
    AnyRef
  77. def newMutableProjection(expressions: Seq[Expression], inputSchema: Seq[Attribute], useSubexprElimination: Boolean = false): MutableProjection

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    Attributes
    protected
    Definition Classes
    SparkPlan
  78. def newNaturalAscendingOrdering(dataTypes: Seq[DataType]): Ordering[InternalRow]

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    Creates a row ordering for the given schema, in natural ascending order.

    Creates a row ordering for the given schema, in natural ascending order.

    Attributes
    protected
    Definition Classes
    SparkPlan
  79. def newOrdering(order: Seq[SortOrder], inputSchema: Seq[Attribute]): Ordering[InternalRow]

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    Attributes
    protected
    Definition Classes
    SparkPlan
  80. def newPredicate(expression: Expression, inputSchema: Seq[Attribute]): Predicate

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    Attributes
    protected
    Definition Classes
    SparkPlan
  81. def nodeName: String

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    Definition Classes
    TreeNode
  82. final def notify(): Unit

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    Definition Classes
    AnyRef
  83. final def notifyAll(): Unit

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    Definition Classes
    AnyRef
  84. def numberedTreeString: String

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    Definition Classes
    TreeNode
  85. val origin: Origin

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    Definition Classes
    TreeNode
  86. def otherCopyArgs: Seq[AnyRef]

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    Attributes
    protected
    Definition Classes
    TreeNode
  87. def output: Seq[Attribute]

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    Definition Classes
    SampleExec → QueryPlan
  88. def outputOrdering: Seq[SortOrder]

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    Specifies how data is ordered in each partition.

    Specifies how data is ordered in each partition.

    Definition Classes
    SparkPlan
  89. def outputPartitioning: Partitioning

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    Specifies how data is partitioned across different nodes in the cluster.

    Specifies how data is partitioned across different nodes in the cluster.

    Definition Classes
    SampleExecSparkPlan
  90. def outputSet: AttributeSet

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    Definition Classes
    QueryPlan
  91. def p(number: Int): SparkPlan

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    Definition Classes
    TreeNode
  92. var parent: CodegenSupport

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    Which SparkPlan is calling produce() of this one.

    Which SparkPlan is calling produce() of this one. It's itself for the first SparkPlan.

    Attributes
    protected
    Definition Classes
    CodegenSupport
  93. def preCanonicalized: SparkPlan

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    Attributes
    protected
    Definition Classes
    QueryPlan
  94. final def prepare(): Unit

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    Prepare a SparkPlan for execution.

    Prepare a SparkPlan for execution. It's idempotent.

    Definition Classes
    SparkPlan
  95. def prepareSubqueries(): Unit

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    Finds scalar subquery expressions in this plan node and starts evaluating them.

    Finds scalar subquery expressions in this plan node and starts evaluating them.

    Attributes
    protected
    Definition Classes
    SparkPlan
  96. def prettyJson: String

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    Definition Classes
    TreeNode
  97. def printSchema(): Unit

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    Definition Classes
    QueryPlan
  98. final def produce(ctx: CodegenContext, parent: CodegenSupport): String

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    Returns Java source code to process the rows from input RDD.

    Returns Java source code to process the rows from input RDD.

    Definition Classes
    CodegenSupport
  99. def producedAttributes: AttributeSet

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    Definition Classes
    QueryPlan
  100. def references: AttributeSet

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    Definition Classes
    QueryPlan
  101. def requiredChildDistribution: Seq[Distribution]

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    Specifies any partition requirements on the input data for this operator.

    Specifies any partition requirements on the input data for this operator.

    Definition Classes
    SparkPlan
  102. def requiredChildOrdering: Seq[Seq[SortOrder]]

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    Specifies sort order for each partition requirements on the input data for this operator.

    Specifies sort order for each partition requirements on the input data for this operator.

    Definition Classes
    SparkPlan
  103. def resetMetrics(): Unit

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    Reset all the metrics.

    Reset all the metrics.

    Definition Classes
    SparkPlan
  104. final def sameResult(other: SparkPlan): Boolean

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    Definition Classes
    QueryPlan
  105. lazy val schema: StructType

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    Definition Classes
    QueryPlan
  106. def schemaString: String

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    Definition Classes
    QueryPlan
  107. val seed: Long

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    the random seed

  108. final def semanticHash(): Int

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    Definition Classes
    QueryPlan
  109. def shouldStopRequired: Boolean

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    Set to false if this plan consumes all rows produced by children but doesn't output row to buffer by calling append(), so the children don't require shouldStop() in the loop of producing rows.

    Set to false if this plan consumes all rows produced by children but doesn't output row to buffer by calling append(), so the children don't require shouldStop() in the loop of producing rows.

    Attributes
    protected
    Definition Classes
    CodegenSupport
  110. def simpleString: String

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    Definition Classes
    QueryPlan → TreeNode
  111. def sparkContext: SparkContext

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    Attributes
    protected
    Definition Classes
    SparkPlan
  112. final val sqlContext: SQLContext

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    A handle to the SQL Context that was used to create this plan.

    A handle to the SQL Context that was used to create this plan. Since many operators need access to the sqlContext for RDD operations or configuration this field is automatically populated by the query planning infrastructure.

    Definition Classes
    SparkPlan
  113. def statePrefix: String

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    Attributes
    protected
    Definition Classes
    QueryPlan
  114. def stringArgs: Iterator[Any]

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    Attributes
    protected
    Definition Classes
    TreeNode
  115. val subexpressionEliminationEnabled: Boolean

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    Definition Classes
    SparkPlan
  116. def subqueries: Seq[SparkPlan]

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    Definition Classes
    QueryPlan
  117. def supportCodegen: Boolean

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    Whether this SparkPlan support whole stage codegen or not.

    Whether this SparkPlan support whole stage codegen or not.

    Definition Classes
    CodegenSupport
  118. final def synchronized[T0](arg0: ⇒ T0): T0

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    Definition Classes
    AnyRef
  119. def toJSON: String

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    Definition Classes
    TreeNode
  120. def toString(): String

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    Definition Classes
    TreeNode → AnyRef → Any
  121. def transform(rule: PartialFunction[SparkPlan, SparkPlan]): SparkPlan

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    Definition Classes
    TreeNode
  122. def transformAllExpressions(rule: PartialFunction[Expression, Expression]): SampleExec.this.type

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    Definition Classes
    QueryPlan
  123. def transformDown(rule: PartialFunction[SparkPlan, SparkPlan]): SparkPlan

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    Definition Classes
    TreeNode
  124. def transformExpressions(rule: PartialFunction[Expression, Expression]): SampleExec.this.type

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    Definition Classes
    QueryPlan
  125. def transformExpressionsDown(rule: PartialFunction[Expression, Expression]): SampleExec.this.type

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    Definition Classes
    QueryPlan
  126. def transformExpressionsUp(rule: PartialFunction[Expression, Expression]): SampleExec.this.type

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    Definition Classes
    QueryPlan
  127. def transformUp(rule: PartialFunction[SparkPlan, SparkPlan]): SparkPlan

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    Definition Classes
    TreeNode
  128. def treeString(verbose: Boolean, addSuffix: Boolean): String

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    Definition Classes
    TreeNode
  129. def treeString: String

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    Definition Classes
    TreeNode
  130. val upperBound: Double

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    Upper-bound of the sampling probability.

    Upper-bound of the sampling probability. The expected fraction sampled will be ub - lb.

  131. def usedInputs: AttributeSet

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    The subset of inputSet those should be evaluated before this plan.

    The subset of inputSet those should be evaluated before this plan.

    We will use this to insert some code to access those columns that are actually used by current plan before calling doConsume().

    Definition Classes
    CodegenSupport
  132. def validConstraints: Set[Expression]

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    Attributes
    protected
    Definition Classes
    QueryPlan
  133. def verboseString: String

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    Definition Classes
    QueryPlan → TreeNode
  134. def verboseStringWithSuffix: String

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    Definition Classes
    TreeNode
  135. final def wait(): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  136. final def wait(arg0: Long, arg1: Int): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  137. final def wait(arg0: Long): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  138. def waitForSubqueries(): Unit

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    Blocks the thread until all subqueries finish evaluation and update the results.

    Blocks the thread until all subqueries finish evaluation and update the results.

    Attributes
    protected
    Definition Classes
    SparkPlan
  139. def withNewChildren(newChildren: Seq[SparkPlan]): SparkPlan

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    Definition Classes
    TreeNode
  140. val withReplacement: Boolean

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    Whether to sample with replacement.

Inherited from CodegenSupport

Inherited from UnaryExecNode

Inherited from SparkPlan

Inherited from Serializable

Inherited from Serializable

Inherited from Logging

Inherited from QueryPlan[SparkPlan]

Inherited from TreeNode[SparkPlan]

Inherited from Product

Inherited from Equals

Inherited from AnyRef

Inherited from Any

Ungrouped