io.druid.query.aggregation.variance

Class VarianceBufferAggregator.ObjectVarianceAggregator

java.lang.Object

io.druid.query.aggregation.variance.VarianceBufferAggregator

io.druid.query.aggregation.variance.VarianceBufferAggregator.ObjectVarianceAggregator

All Implemented Interfaces:

BufferAggregator, HotLoopCallee

Enclosing class:

VarianceBufferAggregator

public static final class VarianceBufferAggregator.ObjectVarianceAggregator
extends VarianceBufferAggregator

Nested Class Summary

Nested classes/interfaces inherited from class io.druid.query.aggregation.variance.VarianceBufferAggregator

VarianceBufferAggregator.FloatVarianceAggregator, VarianceBufferAggregator.LongVarianceAggregator, VarianceBufferAggregator.ObjectVarianceAggregator

Constructor Summary

Constructors

Constructor and Description
ObjectVarianceAggregator(BaseObjectColumnValueSelector selector)

Method Summary

Modifier and Type	Method and Description
void	aggregate(ByteBuffer buf, int position) Aggregates metric values into the given aggregate byte representation Implementations of this method must read in the aggregate value from the buffer at the given position, aggregate the next element of data and write the updated aggregate value back into the buffer.
void	inspectRuntimeShape(RuntimeShapeInspector inspector) Implementations of this method should call inspector.visit() with all fields of this class, which meet two conditions: 1.

Methods inherited from class io.druid.query.aggregation.variance.VarianceBufferAggregator

close, get, getDouble, getFloat, getLong, init

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.druid.query.aggregation.BufferAggregator

relocate

Constructor Detail

ObjectVarianceAggregator

public ObjectVarianceAggregator(BaseObjectColumnValueSelector selector)

Method Detail

aggregate

public void aggregate(ByteBuffer buf,
                      int position)

Description copied from interface: BufferAggregator

Aggregates metric values into the given aggregate byte representation Implementations of this method must read in the aggregate value from the buffer at the given position, aggregate the next element of data and write the updated aggregate value back into the buffer. Implementations must not change the position, limit or mark of the given buffer

Parameters:

buf - byte buffer storing the byte array representation of the aggregate

position - offset within the byte buffer at which the current aggregate value is stored

inspectRuntimeShape

public void inspectRuntimeShape(RuntimeShapeInspector inspector)

Description copied from interface: BufferAggregator

Implementations of this method should call inspector.visit() with all fields of this class, which meet two conditions: 1. They are used in methods of this class, annotated with CalledFromHotLoop 2. They are either: a. Nullable objects b. Instances of HotLoopCallee c. Objects, which don't always have a specific class in runtime. For example, a field of type Set could be HashSet or TreeSet in runtime, depending on how this instance (the instance on which inspectRuntimeShape() is called) is configured. d. ByteBuffer or similar objects, where byte order matters e. boolean flags, affecting branch taking f. Arrays of objects, meeting any of conditions a-e.

The default implementation inspects nothing. Classes that implement BufferAggregator are encouraged to override this method, following the specification of HotLoopCallee.inspectRuntimeShape(io.druid.query.monomorphicprocessing.RuntimeShapeInspector).