Package org.apache.druid.query.aggregation.any

Class NilVectorAggregator

java.lang.Object

org.apache.druid.query.aggregation.any.NilVectorAggregator

All Implemented Interfaces:

VectorAggregator

public class NilVectorAggregator
extends Object
implements VectorAggregator

A vector aggregator that returns the default numeric value.

Method Summary

Modifier and Type	Method	Description
void	aggregate(ByteBuffer buf, int numRows, int[] positions, int[] rows, int positionOffset)	Aggregate a list of rows ("rows") into a list of aggregation slots ("positions").
void	aggregate(ByteBuffer buf, int position, int startRow, int endRow)	Aggregate a range of rows into a single aggregation slot.
void	close()	Release any resources used by the aggregator.
static NilVectorAggregator	doubleNilVectorAggregator()
static NilVectorAggregator	floatNilVectorAggregator()
Object	get(ByteBuffer buf, int position)	Same as BufferAggregator.get(java.nio.ByteBuffer, int).
void	init(ByteBuffer buf, int position)	Same as BufferAggregator.init(java.nio.ByteBuffer, int).
static NilVectorAggregator	longNilVectorAggregator()

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.VectorAggregator

relocate

Method Detail

doubleNilVectorAggregator

public static NilVectorAggregator doubleNilVectorAggregator()

Returns:

A vectorized aggregator that returns the default double value.

floatNilVectorAggregator

public static NilVectorAggregator floatNilVectorAggregator()

Returns:

A vectorized aggregator that returns the default float value.

longNilVectorAggregator

public static NilVectorAggregator longNilVectorAggregator()

Returns:

A vectorized aggregator that returns the default long value.

init

public void init(ByteBuffer buf,
                 int position)

Description copied from interface: VectorAggregator

Same as BufferAggregator.init(java.nio.ByteBuffer, int).

Specified by:

init in interface VectorAggregator

aggregate

public void aggregate(ByteBuffer buf,
                      int position,
                      int startRow,
                      int endRow)

Description copied from interface: VectorAggregator

Aggregate a range of rows into a single aggregation slot. Implementations must not change the position, limit or mark of the given buffer

Specified by:

aggregate in interface VectorAggregator

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

startRow - first row of the range within the current batch to aggregate (inclusive)

endRow - end row of the range (exclusive)

aggregate

public void aggregate(ByteBuffer buf,
                      int numRows,
                      int[] positions,
                      @Nullable
                      int[] rows,
                      int positionOffset)

Description copied from interface: VectorAggregator

Aggregate a list of rows ("rows") into a list of aggregation slots ("positions"). Implementations must not change the position, limit or mark of the given buffer

Specified by:

aggregate in interface VectorAggregator

Parameters:

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

numRows - number of rows to aggregate

positions - array of aggregate value positions within the buffer; must be at least as long as "numRows"

rows - array of row numbers within the current row batch; must be at least as long as "numRows". If null, the aggregator will aggregate rows from 0 (inclusive) to numRows (exclusive).

positionOffset - an offset to apply to each value from "positions"

get

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

Description copied from interface: VectorAggregator

Same as BufferAggregator.get(java.nio.ByteBuffer, int).

Specified by:

get in interface VectorAggregator

close

public void close()

Description copied from interface: VectorAggregator

Release any resources used by the aggregator. The aggregator may be reused after this call, by calling VectorAggregator.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 VectorAggregator