org.apache.hadoop.hive.ql.exec.vector.mapjoin.fast

Class VectorMapJoinFastBytesHashMapStore.HashMapResult

java.lang.Object

org.apache.hadoop.hive.ql.exec.vector.mapjoin.hashtable.VectorMapJoinHashTableResult

org.apache.hadoop.hive.ql.exec.vector.mapjoin.hashtable.VectorMapJoinHashMapResult

org.apache.hadoop.hive.ql.exec.vector.mapjoin.fast.VectorMapJoinFastBytesHashMapStore.HashMapResult

Enclosing class:

VectorMapJoinFastBytesHashMapStore

public static class VectorMapJoinFastBytesHashMapStore.HashMapResult
extends VectorMapJoinHashMapResult

A hash map result that can read values stored by the key and value store, one-by-one. It also has support routines for checking the hash code and key equality. It implements the standard map join hash map result interface.

Constructor Summary

Constructors

Constructor and Description
HashMapResult()

Method Summary

Modifier and Type	Method and Description
int	cappedCount()
boolean	equalKey(byte[] keyBytes, int keyStart, int keyLength) Compare a key with the key positioned with the setKey method.
WriteBuffers.ByteSegmentRef	first()
String	getDetailedHashMapResultPositionString() Get detailed HashMap result position information to help diagnose exceptions.
boolean	hasRows()
WriteBuffers.ByteSegmentRef	internalRead()
boolean	isCappedCountAvailable()
boolean	isSingleRow()
WriteBuffers.ByteSegmentRef	next()
void	set(VectorMapJoinFastBytesHashMapStore hashMapStore, long refWord) Setup for a match outright.
void	setKey(VectorMapJoinFastBytesHashMapStore hashMapStore, long refWord) Setup for reading the key of an entry with the equalKey method.
void	setMatch() Mark the key matched with equalKey as a match and set up for reading the values.
String	toString()

Methods inherited from class org.apache.hadoop.hive.ql.exec.vector.mapjoin.hashtable.VectorMapJoinHashTableResult

forget, getReadPos, joinResult, setJoinResult, setSpillPartitionId, spillPartitionId

Methods inherited from class java.lang.Object

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

Constructor Detail

HashMapResult

public HashMapResult()

Method Detail

setKey

public void setKey(VectorMapJoinFastBytesHashMapStore hashMapStore,
                   long refWord)

Setup for reading the key of an entry with the equalKey method.

Parameters:

hashMapStore -

refWord -

equalKey

public boolean equalKey(byte[] keyBytes,
                        int keyStart,
                        int keyLength)

Compare a key with the key positioned with the setKey method.

Parameters:

keyBytes -

keyStart -

keyLength -

Returns:

setMatch

public void setMatch()

Mark the key matched with equalKey as a match and set up for reading the values. Afterward, methods isSingleRow, cappedCount, first, next, etc may be called.

set

public void set(VectorMapJoinFastBytesHashMapStore hashMapStore,
                long refWord)

Setup for a match outright.

Parameters:

hashMapStore -

refWord -

hasRows

public boolean hasRows()

Specified by:

hasRows in class VectorMapJoinHashMapResult

Returns:

Whether there are any rows (i.e. true for match).

isSingleRow

public boolean isSingleRow()

Specified by:

isSingleRow in class VectorMapJoinHashMapResult

Returns:

Whether there is 1 value row.

isCappedCountAvailable

public boolean isCappedCountAvailable()

Specified by:

isCappedCountAvailable in class VectorMapJoinHashMapResult

Returns:

Whether there is a capped count available from cappedCount.

cappedCount

public int cappedCount()

Specified by:

cappedCount in class VectorMapJoinHashMapResult

Returns:

The count of values, up to a arbitrary cap limit. When available, the capped count can be used to make decisions on how to optimally generate join results.

first

public WriteBuffers.ByteSegmentRef first()

Specified by:

first in class VectorMapJoinHashMapResult

Returns:

A reference to the first value, or null if there are no values.

next

public WriteBuffers.ByteSegmentRef next()

Specified by:

next in class VectorMapJoinHashMapResult

Returns:

The next value, or null if there are no more values to be read.

internalRead

public WriteBuffers.ByteSegmentRef internalRead()

toString

public String toString()

Overrides:

toString in class VectorMapJoinHashTableResult

getDetailedHashMapResultPositionString

public String getDetailedHashMapResultPositionString()

Get detailed HashMap result position information to help diagnose exceptions.

Specified by:

getDetailedHashMapResultPositionString in class VectorMapJoinHashMapResult