VariableWidthBlock (presto-common 0.278.1 API)

java.lang.Object
- com.facebook.presto.common.block.AbstractVariableWidthBlock
- - com.facebook.presto.common.block.VariableWidthBlock

All Implemented Interfaces:: Block, UncheckedBlock

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

All Methods Instance Methods Concrete Methods
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.
`byte`	`getByteUnchecked(int internalPosition)` Gets a byte value at `internalPosition - getOffsetBase()`.
`int`	`getIntUnchecked(int internalPosition)` Gets a little endian int value at `internalPosition - getOffsetBase()`.
`long`	`getLongUnchecked(int internalPosition)` Gets a little endian long value at `internalPosition - getOffsetBase()`.
`long`	`getLongUnchecked(int internalPosition, int offset)` Gets a little endian long at `offset` in the value at `internalPosition - getOffsetBase()`.
`int`	`getOffsetBase()`
`int`	`getPositionCount()` Returns the number of positions in this block.
`int`	`getPositionOffset(int position)`
`long`	`getPositionsSizeInBytes(boolean[] positions, int usedPositionCount)` Returns the size of all positions marked true in the positions array.
`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.
`short`	`getShortUnchecked(int internalPosition)` Gets a little endian short at value at `internalPosition - getOffsetBase()`.
`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`.
`int`	`getSliceLengthUnchecked(int internalPosition)` Gets the length of the slice value at `internalPosition - getOffsetBase()`.
`io.airlift.slice.Slice`	`getSliceUnchecked(int internalPosition, int offset, int length)` Gets a slice with offset `offset` at `internalPosition - getOffsetBase()`.
`int`	`hashCode()`
`protected boolean`	`isEntryNull(int position)`
`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()`

Methods inherited from class com.facebook.presto.common.block.AbstractVariableWidthBlock
bytesCompare, bytesEqual, checkReadablePosition, compareTo, equals, getByte, getEncodingName, getEstimatedDataSizeForStats, getInt, getLong, getLong, getShort, getSingleValueBlock, getSlice, hash, isNull, writeBytesTo, writeBytesTo, writePositionTo, writePositionTo

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
getApproximateRegionLogicalSizeInBytes, getBlock, getLoadedBlock, getLogicalSizeInBytes, getPositions, getRegionLogicalSizeInBytes

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

- Constructor Detail
  - VariableWidthBlock
```
public VariableWidthBlock(int positionCount,
                          io.airlift.slice.Slice slice,
                          int[] offsets,
                          Optional<boolean[]> valueIsNull)
```
- Method Detail
  - getPositionOffset
```
public 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.
  - 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
    
    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.
  - getPositionsSizeInBytes
```
public long getPositionsSizeInBytes(boolean[] positions,
                                    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.
  - 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(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
  - 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
```
public 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
  - getByteUnchecked
```
public byte getByteUnchecked(int internalPosition)
```
    Description copied from interface: UncheckedBlock
    
    Gets a byte value at internalPosition - getOffsetBase().
  - getShortUnchecked
```
public short getShortUnchecked(int internalPosition)
```
    Description copied from interface: UncheckedBlock
    
    Gets a little endian short at value at internalPosition - getOffsetBase().
  - getIntUnchecked
```
public int getIntUnchecked(int internalPosition)
```
    Description copied from interface: UncheckedBlock
    
    Gets a little endian int value at internalPosition - getOffsetBase().
  - getLongUnchecked
```
public long getLongUnchecked(int internalPosition)
```
    Description copied from interface: UncheckedBlock
    
    Gets a little endian long value at internalPosition - getOffsetBase().
  - getLongUnchecked
```
public long getLongUnchecked(int internalPosition,
                             int offset)
```
    Description copied from interface: UncheckedBlock
    
    Gets a little endian long at offset in the value at internalPosition - getOffsetBase().
  - getSliceUnchecked
```
public io.airlift.slice.Slice getSliceUnchecked(int internalPosition,
                                                int offset,
                                                int length)
```
    Description copied from interface: UncheckedBlock
    
    Gets a slice with offset offset at internalPosition - getOffsetBase().
  - getSliceLengthUnchecked
```
public int getSliceLengthUnchecked(int internalPosition)
```
    Description copied from interface: UncheckedBlock
    
    Gets the length of the slice value at internalPosition - getOffsetBase(). This method must be implemented if getSliceUnchecked is implemented.
  - getOffsetBase
```
public int getOffsetBase()
```
    Returns:
    
    the internal offset of the underlying data structure of this block
  - isNullUnchecked
```
public boolean isNullUnchecked(int internalPosition)
```
    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.
  - equals
```
public boolean equals(Object obj)
```
    Overrides:
    
    equals in class Object
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object

Class VariableWidthBlock

Constructor Summary

Method Summary

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

Methods inherited from class java.lang.Object

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

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

Constructor Detail

VariableWidthBlock

Method Detail

getPositionOffset

getSliceLength

mayHaveNull

isEntryNull

getPositionCount

getSizeInBytes

fixedSizeInBytesPerPosition

getRegionSizeInBytes

getPositionsSizeInBytes

getRetainedSizeInBytes

retainedBytesForEachPart

copyPositions

getRawSlice

getRegion

copyRegion

toString

getByteUnchecked

getShortUnchecked

getIntUnchecked

getLongUnchecked

getLongUnchecked

getSliceUnchecked

getSliceLengthUnchecked

getOffsetBase

isNullUnchecked

appendNull

equals

hashCode