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object UnionEstimation

Estimate the number of output rows by doing the sum of output rows for each child of union, and estimate min and max stats for each column by finding the overall min and max of that column coming from its children.

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  1. final def !=(arg0: Any): Boolean
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  2. final def ##: Int
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  6. final def eq(arg0: AnyRef): Boolean
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  7. def equals(arg0: AnyRef): Boolean
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  8. def estimate(union: Union): Option[Statistics]
  9. def finalize(): Unit
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  10. final def getClass(): Class[_ <: AnyRef]
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  20. final def wait(arg0: Long): Unit
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