io.prestosql.operator.aggregation.histogram

Class GroupedHistogramState

java.lang.Object

io.prestosql.operator.aggregation.state.AbstractGroupedAccumulatorState

io.prestosql.operator.aggregation.histogram.GroupedHistogramState

All Implemented Interfaces:

HistogramState, AccumulatorState, GroupedAccumulatorState

public class GroupedHistogramState
extends AbstractGroupedAccumulatorState
implements HistogramState

state object that uses a single histogram for all groups. See GroupedTypedHistogram

Constructor Summary

Constructors

Constructor and Description
GroupedHistogramState(Type keyType, int expectedEntriesCount)

Method Summary

Modifier and Type	Method and Description
void	addMemoryUsage(long memory)
void	deserialize(Block block, Type type, int expectedSize)
void	ensureCapacity(long size)
TypedHistogram	get() will create an empty histogram if none exists
long	getEstimatedSize()

Methods inherited from class io.prestosql.operator.aggregation.state.AbstractGroupedAccumulatorState

getGroupId, setGroupId

Methods inherited from class java.lang.Object

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

Constructor Detail

GroupedHistogramState

public GroupedHistogramState(Type keyType,
                             int expectedEntriesCount)

Method Detail

ensureCapacity

public void ensureCapacity(long size)

Specified by:

ensureCapacity in interface GroupedAccumulatorState

get

public TypedHistogram get()

Description copied from interface: HistogramState

will create an empty histogram if none exists

Specified by:

get in interface HistogramState

Returns:

histogram based on the type of state (single, grouped). Note that empty histograms will serialize to null as required

deserialize

public void deserialize(Block block,
                        Type type,
                        int expectedSize)

Specified by:

deserialize in interface HistogramState

addMemoryUsage

public void addMemoryUsage(long memory)

Specified by:

addMemoryUsage in interface HistogramState

getEstimatedSize

public long getEstimatedSize()

Specified by:

getEstimatedSize in interface AccumulatorState