io.crate.operation.aggregation.impl

Class MinimumAggregation

java.lang.Object

io.crate.operation.aggregation.AggregationFunction<java.lang.Comparable,java.lang.Comparable>

io.crate.operation.aggregation.impl.MinimumAggregation

All Implemented Interfaces:

FunctionImplementation<Function>

public abstract class MinimumAggregation
extends AggregationFunction<java.lang.Comparable,java.lang.Comparable>

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	NAME

Method Summary

Methods

Modifier and Type	Method and Description
FunctionInfo	info()
java.lang.Comparable	iterate(RamAccountingContext ramAccountingContext, java.lang.Comparable state, Input... args) the "aggregate" function.
DataType	partialType()
static void	register(AggregationImplModule mod)
java.lang.Comparable	terminatePartial(RamAccountingContext ramAccountingContext, java.lang.Comparable state) Called to transform partial states into their final form.

Methods inherited from class io.crate.operation.aggregation.AggregationFunction

newState, normalizeSymbol, reduce

Methods inherited from class java.lang.Object

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

Field Detail

NAME

public static final java.lang.String NAME

See Also:

Constant Field Values

Method Detail

register

public static void register(AggregationImplModule mod)

info

public FunctionInfo info()

partialType

public DataType partialType()

Specified by:

partialType in class AggregationFunction<java.lang.Comparable,java.lang.Comparable>

terminatePartial

public java.lang.Comparable terminatePartial(RamAccountingContext ramAccountingContext,
                                    java.lang.Comparable state)

Description copied from class: AggregationFunction

Called to transform partial states into their final form. This might result in a loss of "meta data" that was necessary to compute the final value.

Specified by:

terminatePartial in class AggregationFunction<java.lang.Comparable,java.lang.Comparable>

iterate

public java.lang.Comparable iterate(RamAccountingContext ramAccountingContext,
                           java.lang.Comparable state,
                           Input... args)
                             throws CircuitBreakingException

Description copied from class: AggregationFunction

the "aggregate" function.

Specified by:

iterate in class AggregationFunction<java.lang.Comparable,java.lang.Comparable>

Parameters:

ramAccountingContext - used to account for additional memory usage if the state grows in size

state - the previous aggregation state

args - arguments / input values matching the types of FunctionInfo.argumentTypes. These are usually used to increment/modify the previous state

Returns:

The new/changed state. This might be either a new instance or the same but mutated instance. Users of the AggregationFunction should always use the return value, but must be aware that the input state might have changed too.

Throws:

CircuitBreakingException