com.facebook.presto.common.block

Class MapBlock

java.lang.Object

com.facebook.presto.common.block.AbstractMapBlock

com.facebook.presto.common.block.MapBlock

All Implemented Interfaces:

Block, UncheckedBlock

public class MapBlock
extends AbstractMapBlock
implements Block

Nested Class Summary

Nested classes/interfaces inherited from class com.facebook.presto.common.block.AbstractMapBlock

AbstractMapBlock.HashTables

Field Summary

Fields inherited from class com.facebook.presto.common.block.AbstractMapBlock

logicalSizeInBytes

Method Summary

Modifier and Type	Method and Description
static MapBlock	createMapBlockInternal(int startOffset, int positionCount, Optional<boolean[]> mapIsNull, int[] offsets, Block keyBlock, Block valueBlock, AbstractMapBlock.HashTables hashTables) Create a map block directly without per element validations.
protected void	ensureHashTableLoaded(MethodHandle keyBlockHashCode)
boolean	equals(Object obj)
static MapBlock	fromKeyValueBlock(int positionCount, Optional<boolean[]> mapIsNull, int[] offsets, Block keyBlock, Block valueBlock) Create a map block directly from columnar nulls, keys, values, and offsets into the keys and values.
protected AbstractMapBlock.HashTables	getHashTables()
Block	getLoadedBlock() Returns a block that assures all data is in memory.
protected boolean[]	getMapIsNull()
int	getOffsetBase() offset is entry-based, not position-based.
protected int[]	getOffsets() offset is entry-based, not position-based.
int	getPositionCount() Returns the number of positions in this block.
protected Block	getRawKeyBlock()
protected Block	getRawValueBlock()
long	getRetainedSizeInBytes() Returns the retained size of this block in memory, including over-allocations.
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()
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.AbstractMapBlock

appendNull, copyPositions, copyRegion, fixedSizeInBytesPerPosition, getApproximateRegionLogicalSizeInBytes, getBlock, getBlockUnchecked, getEncodingName, getEstimatedDataSizeForStats, getLogicalSizeInBytes, getPositionsSizeInBytes, getRegion, getRegionLogicalSizeInBytes, getRegionSizeInBytes, getSingleValueBlockInternal, isHashTablesPresent, isNull, isNullUnchecked, mayHaveNull, 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

appendNull, bytesCompare, bytesEqual, compareTo, copyPositions, copyRegion, equals, fixedSizeInBytesPerPosition, getApproximateRegionLogicalSizeInBytes, getBlock, getByte, getEncodingName, getEstimatedDataSizeForStats, getInt, getLogicalSizeInBytes, getLong, getLong, getPositions, getPositionsSizeInBytes, getRegion, getRegionLogicalSizeInBytes, getRegionSizeInBytes, getShort, getSlice, getSliceLength, hash, isNull, mayHaveNull, writeBytesTo, writeBytesTo, writePositionTo, writePositionTo

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

getBlockUnchecked, getByteUnchecked, getIntUnchecked, getLongUnchecked, getLongUnchecked, getShortUnchecked, getSliceLengthUnchecked, getSliceUnchecked, isNullUnchecked

Method Detail

fromKeyValueBlock

public static MapBlock fromKeyValueBlock(int positionCount,
                                         Optional<boolean[]> mapIsNull,
                                         int[] offsets,
                                         Block keyBlock,
                                         Block valueBlock)

Create a map block directly from columnar nulls, keys, values, and offsets into the keys and values. A null map must have no entries.

createMapBlockInternal

public static MapBlock createMapBlockInternal(int startOffset,
                                              int positionCount,
                                              Optional<boolean[]> mapIsNull,
                                              int[] offsets,
                                              Block keyBlock,
                                              Block valueBlock,
                                              AbstractMapBlock.HashTables hashTables)

Create a map block directly without per element validations.

Internal use by this package and com.facebook.presto.spi.Type only.

getRawKeyBlock

protected Block getRawKeyBlock()

Specified by:

getRawKeyBlock in class AbstractMapBlock

getRawValueBlock

protected Block getRawValueBlock()

Specified by:

getRawValueBlock in class AbstractMapBlock

getHashTables

protected AbstractMapBlock.HashTables getHashTables()

Specified by:

getHashTables in class AbstractMapBlock

getOffsets

protected int[] getOffsets()

Description copied from class: AbstractMapBlock

offset is entry-based, not position-based. In other words, if offset[1] is 6, it means the first map has 6 key-value pairs, not 6 key/values (which would be 3 pairs).

Specified by:

getOffsets in class AbstractMapBlock

getOffsetBase

public int getOffsetBase()

Description copied from class: AbstractMapBlock

offset is entry-based, not position-based. (see getOffsets)

Specified by:

getOffsetBase in interface UncheckedBlock

Specified by:

getOffsetBase in class AbstractMapBlock

Returns:

the internal offset of the underlying data structure of this block

getMapIsNull

@Nullable
protected boolean[] getMapIsNull()

Specified by:

getMapIsNull in class AbstractMapBlock

getPositionCount

public int getPositionCount()

Description copied from interface: Block

Returns the number of positions in this block.

Specified by:

getPositionCount in interface 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.

Specified by:

getSizeInBytes 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

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

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

toString

public String toString()

Overrides:

toString in class Object

getLoadedBlock

public Block getLoadedBlock()

Description copied from interface: Block

Returns a block that assures all data is in memory. May return the same block if all block data is already in memory.

This allows streaming data sources to skip sections that are not accessed in a query.

Specified by:

getLoadedBlock in interface Block

ensureHashTableLoaded

protected void ensureHashTableLoaded(MethodHandle keyBlockHashCode)

Specified by:

ensureHashTableLoaded in class AbstractMapBlock

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object