Package dev.frostlake.functions.aggregate

Class PercentileDiscAccumulator

java.lang.Object

dev.frostlake.functions.aggregate.PercentileDiscAccumulator

All Implemented Interfaces:

CoercedNumericArgumentAccumulator, AggregateFunction.Accumulator

public class PercentileDiscAccumulator
extends Object
implements AggregateFunction.Accumulator, CoercedNumericArgumentAccumulator

Accumulator for PercentileDisc, delegating to AggregateNumerics.percentileDisc(Iterable, double). It PICKS an input rather than computing one, so the value is handed back as it arrived and keeps its column's own scale — collapsing it to a double lost that, turning a NUMBER(10,2)'s 2.00 into 2.0. A VARCHAR or VARIANT key is the one exception: live converts it to a whole number, and the declaration says so (CoercedNumericArgumentAccumulator).

Constructor Summary

Constructors

Constructor	Description
PercentileDiscAccumulator(double p)

Method Summary

Modifier and Type	Method	Description
void	accumulate(Object v)	Folds one row's argument value into the running state.
Object	getResult()	The aggregate's result over everything accumulated so far.
void	merge(AggregateFunction.Accumulator other)	Folds another accumulator's state into this one, combining two partial aggregations of the same group.
void	reset()	Clears the state back to the empty-group starting point so the accumulator can be reused.
void	setCoercedNumericArgument(boolean coerced)	Tell the accumulator whether its argument is declared VARCHAR or VARIANT.
void	setPercentile(double p)	The fraction, for the window path where the accumulator is built before the call is read.

Methods inherited from class java.lang.Object

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

Constructor Details

PercentileDiscAccumulator

public PercentileDiscAccumulator(double p)

Method Details

setPercentile

public void setPercentile(double p)

The fraction, for the window path where the accumulator is built before the call is read.

setCoercedNumericArgument

public void setCoercedNumericArgument(boolean coerced)

Description copied from interface: CoercedNumericArgumentAccumulator

Tell the accumulator whether its argument is declared VARCHAR or VARIANT.

Specified by:

setCoercedNumericArgument in interface CoercedNumericArgumentAccumulator

Parameters:

coerced - whether the aggregated expression is text or VARIANT, converted value by value

accumulate

public void accumulate(Object v)

Description copied from interface: AggregateFunction.Accumulator

Folds one row's argument value into the running state.

Specified by:

accumulate in interface AggregateFunction.Accumulator

Parameters:

v - the aggregate argument's value for one row; SQL NULL arrives as null

getResult

public Object getResult()

Description copied from interface: AggregateFunction.Accumulator

The aggregate's result over everything accumulated so far.

Specified by:

getResult in interface AggregateFunction.Accumulator

Returns:

the group's result, or null where the aggregate defines an empty group as NULL

reset

public void reset()

Description copied from interface: AggregateFunction.Accumulator

Clears the state back to the empty-group starting point so the accumulator can be reused.

Specified by:

reset in interface AggregateFunction.Accumulator

merge

public void merge(AggregateFunction.Accumulator other)

Description copied from interface: AggregateFunction.Accumulator

Folds another accumulator's state into this one, combining two partial aggregations of the same group.

Specified by:

merge in interface AggregateFunction.Accumulator

Parameters:

other - a partial state of the same aggregate implementation