com.facebook.presto.spi.function

Interface AccumulatorStateFactory<T>

public interface AccumulatorStateFactory<T>

Method Summary

Modifier and Type	Method and Description
T	createGroupedState() Return value is also guaranteed to implement GroupedAccumulatorState
T	createSingleState()
Class<? extends T>	getGroupedStateClass()
Class<? extends T>	getSingleStateClass()

Method Detail

createSingleState

T createSingleState()

getSingleStateClass

Class<? extends T> getSingleStateClass()

createGroupedState

T createGroupedState()

Return value is also guaranteed to implement GroupedAccumulatorState

getGroupedStateClass

Class<? extends T> getGroupedStateClass()