@EverythingIsNonnullByDefault

Package org.apache.druid.query.aggregation

Interface Summary

Interface	Description
AggregateCombiner<T>	AggregateCombiner is used to fold rollup aggregation results from serveral "rows" of different indexes during index merging (see IndexMerger).
Aggregator	An Aggregator is an object that can aggregate metrics.
BufferAggregator	A BufferAggregator is an object that can aggregate metrics into a ByteBuffer.
MetricManipulationFn
PostAggregator	Functionally similar to an Aggregator.
VectorAggregator	An object that can aggregate metrics into a ByteBuffer, from vectorized column selectors.

Class Summary

Class	Description
AggregatorAdapters	A class that helps query engines use Buffer- or VectorAggregators in a consistent way.
AggregatorFactory	AggregatorFactory is a strategy (in the terms of Design Patterns) that represents column aggregation, e.
AggregatorUtil
CountAggregator
CountAggregatorFactory
CountBufferAggregator
CountVectorAggregator
DelegatingAggregator	An Aggregator that delegates everything.
DelegatingBufferAggregator	A BufferAggregator that delegates everything.
DoubleAggregateCombiner	Specialization of AggregateCombiner for primitive double aggregations.
DoubleMaxAggregator
DoubleMaxAggregatorFactory
DoubleMaxBufferAggregator
DoubleMinAggregator
DoubleMinAggregatorFactory
DoubleMinBufferAggregator
DoubleSumAggregator
DoubleSumAggregatorFactory
DoubleSumBufferAggregator
DoubleSumVectorAggregator
FilteredAggregator
FilteredAggregatorFactory
FilteredBufferAggregator
FilteredVectorAggregator
FloatMaxAggregator
FloatMaxAggregatorFactory
FloatMaxBufferAggregator
FloatMinAggregator
FloatMinAggregatorFactory
FloatMinBufferAggregator
FloatSumAggregator
FloatSumAggregatorFactory
FloatSumBufferAggregator
FloatSumVectorAggregator
Histogram
HistogramAggregator
HistogramAggregatorFactory
HistogramBufferAggregator
HistogramVisual
JavaScriptAggregator
JavaScriptAggregatorFactory
JavaScriptBufferAggregator
LongAggregateCombiner	Specialization of AggregateCombiner for primitive long aggregations.
LongMaxAggregator
LongMaxAggregatorFactory
LongMaxBufferAggregator
LongMinAggregator
LongMinAggregatorFactory
LongMinBufferAggregator
LongSumAggregateCombiner
LongSumAggregator
LongSumAggregatorFactory
LongSumBufferAggregator
LongSumVectorAggregator
MetricManipulatorFns
NoopAggregator
NoopBufferAggregator
NoopVectorAggregator
NullableNumericAggregateCombiner<T>	Null-aware numeric AggregateCombiner.
NullableNumericAggregator	Null-aware numeric Aggregator.
NullableNumericAggregatorFactory<T extends BaseNullableColumnValueSelector>	Abstract superclass for null-aware numeric aggregators.
NullableNumericBufferAggregator	Null-aware numeric BufferAggregator.
NullableNumericVectorAggregator	A wrapper around a non-null-aware VectorAggregator that makes it null-aware.
ObjectAggregateCombiner<T>	Specialization of AggregateCombiner for object aggregations.
SerializablePairLongString
SerializablePairLongStringSerde	The SerializablePairLongStringSerde serializes a Long-String pair (SerializablePairLongString).
SimpleDoubleAggregatorFactory	This is an abstract class inherited by various AggregatorFactory implementations that consume double input and produce double output on aggregation.
SimpleDoubleBufferAggregator
SimpleFloatAggregatorFactory
SimpleFloatBufferAggregator
SimpleLongAggregatorFactory	This is an abstract class inherited by various AggregatorFactory implementations that consume long input and produce long output on aggregation.
SimpleLongBufferAggregator
StringColumnDoubleAggregatorWrapper	This class can be used to wrap Double Aggregator that consume double type columns to handle String type.
StringColumnDoubleBufferAggregatorWrapper	This class can be used to wrap Double BufferAggregator that consume double type columns to handle String type.
StringColumnFloatAggregatorWrapper	This class can be used to wrap Float Aggregator that consume float type columns to handle String type.
StringColumnFloatBufferAggregatorWrapper	This class can be used to wrap Float BufferAggregator that consume float type columns to handle String type.
StringColumnLongAggregatorWrapper	This class can be used to wrap Long Aggregator that consume long type columns to handle String type.
StringColumnLongBufferAggregatorWrapper	This class can be used to wrap Long BufferAggregator that consume long type columns to handle String type.
SuppressedAggregatorFactory	This AggregatorFactory is meant for wrapping delegate aggregators for optimization purposes.
SuppressedAggregatorFactory.SuppressedAggregator
SuppressedAggregatorFactory.SuppressedBufferAggregator
SuppressedAggregatorFactory.SuppressedVectorAggregator

Exception Summary

Exception	Description
AggregatorFactoryNotMergeableException