com.facebook.presto.common.block

Class ShortArrayBlock

java.lang.Object

com.facebook.presto.common.block.ShortArrayBlock

All Implemented Interfaces:

Block, UncheckedBlock

public class ShortArrayBlock
extends Object
implements Block

Field Summary

Fields

Modifier and Type	Field and Description
static int	SIZE_IN_BYTES_PER_POSITION

Constructor Summary

Constructors

Constructor and Description
ShortArrayBlock(int positionCount, Optional<boolean[]> valueIsNull, short[] values)

Method Summary

Modifier and Type	Method and Description
Block	appendNull() Returns a block that has an appended null at the end, no matter if the original block has null or not.
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.
boolean	equals(Object obj)
OptionalInt	fixedSizeInBytesPerPosition() Returns the number of bytes (in terms of Block.getSizeInBytes()) required per position that this block contains, assuming that the number of bytes required is a known static quantity and not dependent on any particular specific position.
String	getEncodingName() Get the encoding for this block.
long	getEstimatedDataSizeForStats(int position) Returns the estimated in memory data size for stats of position.
int	getOffsetBase()
int	getPositionCount() Returns the number of positions in this block.
long	getPositionsSizeInBytes(boolean[] usedPositions, int usedPositionCount) Returns the size of all positions marked true in the positions array.
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.
short	getShort(int position) Gets a little endian short at in the value at position.
short	getShortUnchecked(int internalPosition) Gets a little endian short at value at internalPosition - getOffsetBase().
Block	getSingleValueBlock(int position) Gets the value at the specified position as a single element block.
long	getSizeInBytes() Returns the size of this block as if it was compacted, ignoring any over-allocations.
int	hashCode()
boolean	isNull(int position) Is the specified position null?
boolean	isNullUnchecked(int internalPosition)
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(ObjLongConsumer<Object> consumer) consumer visits each of the internal data container and accepts the size for it.
String	toString()
void	writePositionTo(int position, BlockBuilder blockBuilder) Appends the value at position to blockBuilder and close the entry.
void	writePositionTo(int position, io.airlift.slice.SliceOutput output) Appends the value at position to output.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

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

bytesCompare, bytesEqual, compareTo, equals, getApproximateRegionLogicalSizeInBytes, getBlock, getByte, getInt, getLoadedBlock, getLogicalSizeInBytes, getLong, getLong, getPositions, getRegionLogicalSizeInBytes, getSlice, getSliceLength, hash, writeBytesTo, writeBytesTo

Methods inherited from interface com.facebook.presto.common.block.UncheckedBlock

getBlockUnchecked, getByteUnchecked, getIntUnchecked, getLongUnchecked, getLongUnchecked, getSliceLengthUnchecked, getSliceUnchecked

Field Detail

SIZE_IN_BYTES_PER_POSITION

public static final int SIZE_IN_BYTES_PER_POSITION

See Also:

Constant Field Values

Constructor Detail

ShortArrayBlock

public ShortArrayBlock(int positionCount,
                       Optional<boolean[]> valueIsNull,
                       short[] values)

Method Detail

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.

Specified by:

getSizeInBytes in interface Block

fixedSizeInBytesPerPosition

public OptionalInt fixedSizeInBytesPerPosition()

Description copied from interface: Block

Returns the number of bytes (in terms of Block.getSizeInBytes()) required per position that this block contains, assuming that the number of bytes required is a known static quantity and not dependent on any particular specific position. This allows for some complex block wrappings to potentially avoid having to call Block.getPositionsSizeInBytes(boolean[], int) which would require computing the specific positions selected

Specified by:

fixedSizeInBytesPerPosition in interface Block

Returns:

The size in bytes, per position, if this block type does not require specific position information to compute its size

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.

Specified by:

getRegionSizeInBytes in interface Block

getPositionsSizeInBytes

public long getPositionsSizeInBytes(boolean[] usedPositions,
                                    int usedPositionCount)

Description copied from interface: Block

Returns the size 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.

Specified by:

getPositionsSizeInBytes in interface Block

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.

Specified by:

getRetainedSizeInBytes in interface Block

getEstimatedDataSizeForStats

public long getEstimatedDataSizeForStats(int position)

Description copied from interface: Block

Returns the estimated in memory data size for stats of position. Do not use it for other purpose.

Specified by:

getEstimatedDataSizeForStats in interface Block

retainedBytesForEachPart

public void retainedBytesForEachPart(ObjLongConsumer<Object> 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

Specified by:

retainedBytesForEachPart in interface Block

getPositionCount

public int getPositionCount()

Description copied from interface: Block

Returns the number of positions in this block.

Specified by:

getPositionCount in interface Block

getShort

public short getShort(int position)

Description copied from interface: Block

Gets a little endian short at in the value at position.

Specified by:

getShort in interface Block

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.

Specified by:

mayHaveNull in interface Block

isNull

public boolean isNull(int position)

Description copied from interface: Block

Is the specified position null?

Specified by:

isNull in interface Block

writePositionTo

public void writePositionTo(int position,
                            BlockBuilder blockBuilder)

Description copied from interface: Block

Appends the value at position to blockBuilder and close the entry.

Specified by:

writePositionTo in interface Block

writePositionTo

public void writePositionTo(int position,
                            io.airlift.slice.SliceOutput output)

Description copied from interface: Block

Appends the value at position to output.

Specified by:

writePositionTo in interface Block

getSingleValueBlock

public Block getSingleValueBlock(int position)

Description copied from interface: Block

Gets the value at the specified position as a single element block. The returned block should retain only the memory required for a single block.

This method is useful for operators that hold on to a single value without holding on to the entire block.

Specified by:

getSingleValueBlock in interface 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.

Specified by:

copyPositions in interface Block

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.

Specified by:

getRegion in interface Block

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.

Specified by:

copyRegion in interface Block

getEncodingName

public String getEncodingName()

Description copied from interface: Block

Get the encoding for this block.

Specified by:

getEncodingName in interface Block

toString

public String toString()

Overrides:

toString in class Object

getShortUnchecked

public short getShortUnchecked(int internalPosition)

Description copied from interface: UncheckedBlock

Gets a little endian short at value at internalPosition - getOffsetBase().

Specified by:

getShortUnchecked in interface UncheckedBlock

getOffsetBase

public int getOffsetBase()

Specified by:

getOffsetBase in interface UncheckedBlock

Returns:

the internal offset of the underlying data structure of this block

isNullUnchecked

public boolean isNullUnchecked(int internalPosition)

Specified by:

isNullUnchecked in interface UncheckedBlock

Returns:

true if value at internalPosition - getOffsetBase() is null

appendNull

public Block appendNull()

Description copied from interface: Block

Returns a block that has an appended null at the end, no matter if the original block has null or not. The original block won't be modified.

Specified by:

appendNull in interface Block

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object