Package org.apache.drill.exec.expr.fn.impl

Class StatisticsAggrFunctions.HllDecode

java.lang.Object

org.apache.drill.exec.expr.fn.impl.StatisticsAggrFunctions.HllDecode

All Implemented Interfaces:

DrillFunc, DrillSimpleFunc

Enclosing class:

StatisticsAggrFunctions

public static class StatisticsAggrFunctions.HllDecode
extends Object
implements DrillSimpleFunc

The log2m parameter defines the accuracy of the counter. The larger the log2m the better the accuracy where: accuracy = 1.04/sqrt(2^log2m) log2m - the number of bits to use as the basis for the HLL instance The parameter accepts integers in the range [0, 30]

Constructor Summary

Constructors

Constructor	Description
HllDecode()

Method Summary

Modifier and Type	Method	Description
void	eval()
void	setup()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

HllDecode

public HllDecode()

Method Details

setup

public void setup()

Specified by:

setup in interface DrillSimpleFunc

eval

public void eval()

Specified by:

eval in interface DrillSimpleFunc