c
org.apache.spark.sql.catalyst.expressions.aggregate
ApproxTopKAggregateBuffer
Companion object ApproxTopKAggregateBuffer
class ApproxTopKAggregateBuffer[T] extends AnyRef
In internal class used as the aggregation buffer for ApproxTopK.
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Instance Constructors
- new ApproxTopKAggregateBuffer(sketch: ItemsSketch[T], nullCount: Long)
- sketch
the ItemsSketch instance for counting not-null items
- nullCount
the count of null items
Value Members
- final def !=(arg0: Any): Boolean
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- final def ##: Int
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- final def ==(arg0: Any): Boolean
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- final def eq(arg0: AnyRef): Boolean
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- def equals(arg0: AnyRef): Boolean
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- def eval(k: Int, itemDataType: DataType): GenericArrayData
Evaluate the buffer and return top K items (including null) with their estimated frequency.
Evaluate the buffer and return top K items (including null) with their estimated frequency. The result is sorted by frequency in descending order.
- final def getClass(): Class[_ <: AnyRef]
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- def hashCode(): Int
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- final def isInstanceOf[T0]: Boolean
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- def merge(other: ApproxTopKAggregateBuffer[T]): ApproxTopKAggregateBuffer[T]
- final def ne(arg0: AnyRef): Boolean
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- final def notify(): Unit
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- final def notifyAll(): Unit
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- def serialize(serDe: ArrayOfItemsSerDe[T]): Array[Byte]
Serialize the buffer into bytes.
Serialize the buffer into bytes. The format is: [sketch bytes][null count (8 bytes Long)]
- val sketch: ItemsSketch[T]
- final def synchronized[T0](arg0: => T0): T0
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- def toString(): String
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- def update(itemExpression: Expression, input: InternalRow): ApproxTopKAggregateBuffer[T]
- final def wait(arg0: Long, arg1: Int): Unit
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- @throws(classOf[java.lang.InterruptedException])
- final def wait(arg0: Long): Unit
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- final def wait(): Unit
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Deprecated Value Members
- def finalize(): Unit
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- @throws(classOf[java.lang.Throwable]) @Deprecated
- Deprecated
(Since version 9)