Package org.apache.druid.query.aggregation

Class ExpressionLambdaBufferAggregator

java.lang.Object

org.apache.druid.query.aggregation.ExpressionLambdaBufferAggregator

All Implemented Interfaces:

BufferAggregator, HotLoopCallee

public class ExpressionLambdaBufferAggregator
extends Object
implements BufferAggregator

Constructor Summary

Constructors

Constructor	Description
ExpressionLambdaBufferAggregator(ExpressionLambdaAggregatorFactory.FactorizePlan thePlan, int maxSizeBytes)

Method Summary

Modifier and Type	Method	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	close()	Release any resources used by the aggregator.
Object	get(ByteBuffer buf, int position)	Returns the intermediate object representation of the given aggregate.
double	getDouble(ByteBuffer buf, int position)	Returns the double representation of the given aggregate byte array Converts the given byte buffer representation into the intermediate aggregate value.
float	getFloat(ByteBuffer buf, int position)	Returns the float representation of the given aggregate byte array Converts the given byte buffer representation into the intermediate aggregate value.
long	getLong(ByteBuffer buf, int position)	Returns the long representation of the given aggregate byte array Converts the given byte buffer representation into the intermediate aggregate value.
void	init(ByteBuffer buf, int position)	Initializes the buffer location Implementations of this method must initialize the byte buffer at the given position Implementations must not change the position, limit or mark of the given buffer This method must not exceed the number of bytes returned by AggregatorFactory.getMaxIntermediateSizeWithNulls() in the corresponding AggregatorFactory

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.druid.query.aggregation.BufferAggregator

inspectRuntimeShape, isNull, relocate

Constructor Detail

ExpressionLambdaBufferAggregator

public ExpressionLambdaBufferAggregator(ExpressionLambdaAggregatorFactory.FactorizePlan thePlan,
                                        int maxSizeBytes)

Method Detail

init

public void init(ByteBuffer buf,
                 int position)

Description copied from interface: BufferAggregator

Initializes the buffer location Implementations of this method must initialize the byte buffer at the given position Implementations must not change the position, limit or mark of the given buffer This method must not exceed the number of bytes returned by AggregatorFactory.getMaxIntermediateSizeWithNulls() in the corresponding AggregatorFactory

Specified by:

init in interface BufferAggregator

Parameters:

buf - byte buffer to initialize

position - offset within the byte buffer for initialization

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

Specified by:

aggregate in interface BufferAggregator

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

get

@Nullable
public Object get(ByteBuffer buf,
                  int position)

Description copied from interface: BufferAggregator

Returns the intermediate object representation of the given aggregate. Converts the given byte buffer representation into an intermediate aggregate Object Implementations must not change the position, limit or mark of the given buffer. The object returned must not have any references to the given buffer (i.e., make a copy), since the underlying buffer is a shared resource and may be given to another processing thread while the objects returned by this aggregator are still in use. If the corresponding AggregatorFactory.combine(Object, Object) method for this aggregator expects its inputs to be mutable, then the object returned by this method must be mutable.

Specified by:

get in interface BufferAggregator

Parameters:

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

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

Returns:

the Object representation of the aggregate

getFloat

public float getFloat(ByteBuffer buf,
                      int position)

Description copied from interface: BufferAggregator

Returns the float representation of the given aggregate byte array Converts the given byte buffer representation into the intermediate aggregate value. Implementations must not change the position, limit or mark of the given buffer Implementations are only required to support this method if they are aggregations which have an AggregatorFactory.getIntermediateType() ()} of ValueType.FLOAT. If unimplemented, throwing an UnsupportedOperationException is common and recommended.

Specified by:

getFloat in interface BufferAggregator

Parameters:

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

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

Returns:

the float representation of the aggregate

getDouble

public double getDouble(ByteBuffer buf,
                        int position)

Description copied from interface: BufferAggregator

Returns the double representation of the given aggregate byte array Converts the given byte buffer representation into the intermediate aggregate value. Implementations must not change the position, limit or mark of the given buffer Implementations are only required to support this method if they are aggregations which have an AggregatorFactory.getIntermediateType() of of ValueType.DOUBLE. If unimplemented, throwing an UnsupportedOperationException is common and recommended. The default implementation casts BufferAggregator.getFloat(ByteBuffer, int) to double. This default method is added to enable smooth backward compatibility, please re-implement it if your aggregators work with numeric double columns.

Specified by:

getDouble in interface BufferAggregator

Parameters:

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

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

Returns:

the double representation of the aggregate

getLong

public long getLong(ByteBuffer buf,
                    int position)

Description copied from interface: BufferAggregator

Returns the long representation of the given aggregate byte array Converts the given byte buffer representation into the intermediate aggregate value. Implementations must not change the position, limit or mark of the given buffer Implementations are only required to support this method if they are aggregations which have an AggregatorFactory.getIntermediateType() of of ValueType.LONG. If unimplemented, throwing an UnsupportedOperationException is common and recommended.

Specified by:

getLong in interface BufferAggregator

Parameters:

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

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

Returns:

the long representation of the aggregate

close

public void close()

Description copied from interface: BufferAggregator

Release any resources used by the aggregator. The aggregator may be reused after this call, by calling BufferAggregator.init(ByteBuffer, int) followed by other methods as normal. This call would be more properly named "reset", but we use the name "close" to improve compatibility with existing aggregator implementations in extensions.

Specified by:

close in interface BufferAggregator