com.facebook.presto.spi.block

Class VariableWidthBlock

java.lang.Object

com.facebook.presto.spi.block.AbstractVariableWidthBlock

com.facebook.presto.spi.block.VariableWidthBlock

All Implemented Interfaces:

Block

public class VariableWidthBlock
extends AbstractVariableWidthBlock

Constructor Summary

Constructors

Constructor and Description
VariableWidthBlock(int positionCount, io.airlift.slice.Slice slice, int[] offsets, Optional<boolean[]> valueIsNull)

Method Summary

Modifier and Type	Method and Description
Block	copyPositions(int[] positions, int offset, int length) Returns a block containing the specified positions.
Block	copyRegion(int positionOffset, int length) Returns a block starting at the specified position and extends for the specified length.
int	getPositionCount() Returns the number of positions in this block.
protected int	getPositionOffset(int position)
long	getPositionsSizeInBytes(boolean[] positions) Returns the size of of all positions marked true in the positions array.
protected io.airlift.slice.Slice	getRawSlice(int position)
Block	getRegion(int positionOffset, int length) Returns a block starting at the specified position and extends for the specified length.
long	getRegionSizeInBytes(int position, int length) Returns the size of block.getRegion(position, length).
long	getRetainedSizeInBytes() Returns the retained size of this block in memory, including over-allocations.
long	getSizeInBytes() Returns the size of this block as if it was compacted, ignoring any over-allocations.
int	getSliceLength(int position) Gets the length of the value at the position.
protected boolean	isEntryNull(int position)
boolean	mayHaveNull() Is it possible the block may have a null value? If false, the block can not contain a null, but if true, the block may or may not have a null.
void	retainedBytesForEachPart(BiConsumer<Object,Long> consumer) consumer visits each of the internal data container and accepts the size for it.
String	toString()

Methods inherited from class com.facebook.presto.spi.block.AbstractVariableWidthBlock

bytesCompare, bytesEqual, checkReadablePosition, compareTo, equals, getByte, getEncodingName, getEstimatedDataSizeForStats, getInt, getLong, getLong, getShort, getSingleValueBlock, getSlice, hash, isNull, writeBytesTo, writePositionTo

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.facebook.presto.spi.block.Block

getLoadedBlock, getLogicalSizeInBytes, getObject, getPositions

Constructor Detail

VariableWidthBlock

public VariableWidthBlock(int positionCount,
                          io.airlift.slice.Slice slice,
                          int[] offsets,
                          Optional<boolean[]> valueIsNull)

Method Detail

getPositionOffset

protected final int getPositionOffset(int position)

Specified by:

getPositionOffset in class AbstractVariableWidthBlock

getSliceLength

public int getSliceLength(int position)

Description copied from interface: Block

Gets the length of the value at the position. This method must be implemented if @{code getSlice} is implemented.

mayHaveNull

public boolean mayHaveNull()

Description copied from interface: Block

Is it possible the block may have a null value? If false, the block can not contain a null, but if true, the block may or may not have a null.

isEntryNull

protected boolean isEntryNull(int position)

Specified by:

isEntryNull in class AbstractVariableWidthBlock

getPositionCount

public int getPositionCount()

Description copied from interface: Block

Returns the number of positions in this block.

getSizeInBytes

public long getSizeInBytes()

Description copied from interface: Block

Returns the size of this block as if it was compacted, ignoring any over-allocations. For example, in dictionary blocks, this only counts each dictionary entry once, rather than each time a value is referenced.

getRegionSizeInBytes

public long getRegionSizeInBytes(int position,
                                 int length)

Description copied from interface: Block

Returns the size of block.getRegion(position, length). The method can be expensive. Do not use it outside an implementation of Block.

getPositionsSizeInBytes

public long getPositionsSizeInBytes(boolean[] positions)

Description copied from interface: Block

Returns the size of of all positions marked true in the positions array. This is equivalent to multiple calls of block.getRegionSizeInBytes(position, length) where you mark all positions for the regions first.

getRetainedSizeInBytes

public long getRetainedSizeInBytes()

Description copied from interface: Block

Returns the retained size of this block in memory, including over-allocations. This method is called from the inner most execution loop and must be fast.

retainedBytesForEachPart

public void retainedBytesForEachPart(BiConsumer<Object,Long> consumer)

Description copied from interface: Block

consumer visits each of the internal data container and accepts the size for it. This method can be helpful in cases such as memory counting for internal data structure. Also, the method should be non-recursive, only visit the elements at the top level, and specifically should not call retainedBytesForEachPart on nested blocks consumer should be called at least once with the current block and must include the instance size of the current block

copyPositions

public Block copyPositions(int[] positions,
                           int offset,
                           int length)

Description copied from interface: Block

Returns a block containing the specified positions. Positions to copy are stored in a subarray within positions array that starts at offset and has length of length. All specified positions must be valid for this block.

The returned block must be a compact representation of the original block.

getRawSlice

protected io.airlift.slice.Slice getRawSlice(int position)

Specified by:

getRawSlice in class AbstractVariableWidthBlock

getRegion

public Block getRegion(int positionOffset,
                       int length)

Description copied from interface: Block

Returns a block starting at the specified position and extends for the specified length. The specified region must be entirely contained within this block.

The region can be a view over this block. If this block is released the region block may also be released. If the region block is released this block may also be released.

copyRegion

public Block copyRegion(int positionOffset,
                        int length)

Description copied from interface: Block

Returns a block starting at the specified position and extends for the specified length. The specified region must be entirely contained within this block.

The region returned must be a compact representation of the original block, unless their internal representation will be exactly the same. This method is useful for operators that hold on to a range of values without holding on to the entire block.

toString

public String toString()

Overrides:

toString in class Object