org.apache.druid.query.aggregation

Class CountVectorAggregator

java.lang.Object

org.apache.druid.query.aggregation.CountVectorAggregator

All Implemented Interfaces:

VectorAggregator

public class CountVectorAggregator
extends Object
implements VectorAggregator

Constructor Summary

Constructors

Constructor and Description
CountVectorAggregator()

Method Summary

Modifier and Type	Method and 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.
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).

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

Constructor Detail

CountVectorAggregator

public CountVectorAggregator()

Method Detail

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

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.

Specified by:

close in interface VectorAggregator