org.apache.spark.sql.catalyst.plans.logical.LogicalPlan

Statistics

case class Statistics(sizeInBytes: BigInt) extends Product with Serializable

Estimates of various statistics. The default estimation logic simply lazily multiplies the corresponding statistic produced by the children. To override this behavior, override statistics and assign it an overriden version of Statistics.

NOTE: concrete and/or overriden versions of statistics fields should pay attention to the performance of the implementations. The reason is that estimations might get triggered in performance-critical processes, such as query plan planning.

sizeInBytes

Physical size in bytes. For leaf operators this defaults to 1, otherwise it defaults to the product of children's sizeInBytes.

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Instance Constructors

  1. new Statistics(sizeInBytes: BigInt)

    sizeInBytes

    Physical size in bytes. For leaf operators this defaults to 1, otherwise it defaults to the product of children's sizeInBytes.

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  14. final def notifyAll(): Unit

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  15. val sizeInBytes: BigInt

    Physical size in bytes.

    Physical size in bytes. For leaf operators this defaults to 1, otherwise it defaults to the product of children's sizeInBytes.

  16. final def synchronized[T0](arg0: ⇒ T0): T0

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