org.apache.solr.client.solrj.io.stream

类 HashJoinStream

java.lang.Object

org.apache.solr.client.solrj.io.stream.TupleStream

org.apache.solr.client.solrj.io.stream.HashJoinStream

所有已实现的接口:

Closeable, Serializable, AutoCloseable, Expressible, MapSerializable, MapWriter, NavigableObject

直接已知子类:

OuterHashJoinStream

public class HashJoinStream
extends TupleStream
implements Expressible

Takes two streams (fullStream and hashStream) and joins them similar to an InnerJoinStream. The difference in a HashJoinStream is that the tuples in the hashStream will all be read and hashed when this stream is opened. This provides a few optimizations iff the hashStream has a relatively small number of documents. You are expected to provide a set of fields for which the hash will be calculated from. If a tuple does not contain a value (ie, null) for one of the fields the hash is being computed on then that tuple will not be considered a match to anything. Ie, all fields which are part of the hash must have a non-null value.

从以下版本开始:

6.0.0

另请参阅:

序列化表格

嵌套类概要

从类继承的嵌套类/接口 org.apache.solr.client.solrj.io.stream.TupleStream

TupleStream.IgnoreException

从接口继承的嵌套类/接口 org.apache.solr.common.MapWriter

MapWriter.EntryWriter

字段概要

字段

限定符和类型	字段和说明
protected TupleStream	fullStream
protected HashMap<String,List<Tuple>>	hashedTuples
protected TupleStream	hashStream
protected List<String>	leftHashOn
protected List<String>	rightHashOn
protected String	workingFullHash
protected Tuple	workingFullTuple
protected int	workngHashSetIdx

构造器概要

构造器

构造器和说明
HashJoinStream(StreamExpression expression, StreamFactory factory)
HashJoinStream(TupleStream fullStream, TupleStream hashStream, List<String> hashOn)

方法概要

限定符和类型	方法和说明
List<TupleStream>	children()
void	close()
protected String	computeHash(Tuple tuple, List<String> hashOn)
int	getCost()
StreamComparator	getStreamSort()
void	open()
Tuple	read()
void	setStreamContext(StreamContext context)
Explanation	toExplanation(StreamFactory factory) Returns an explanation about the stream object
StreamExpression	toExpression(StreamFactory factory)

从类继承的方法 org.apache.solr.client.solrj.io.stream.TupleStream

getShards, getShards, getStreamNodeId, writeMap

从类继承的方法 java.lang.Object

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

从接口继承的方法 org.apache.solr.common.MapWriter

jsonStr, toMap

从接口继承的方法 org.apache.solr.common.NavigableObject

_forEachEntry, _forEachEntry, _forEachEntry, _get, _get, _getStr, _getStr, _size

字段详细资料

hashStream

protected TupleStream hashStream

fullStream

protected TupleStream fullStream

leftHashOn

protected List<String> leftHashOn

rightHashOn

protected List<String> rightHashOn

hashedTuples

protected HashMap<String,List<Tuple>> hashedTuples

workingFullTuple

protected Tuple workingFullTuple

workingFullHash

protected String workingFullHash

workngHashSetIdx

protected int workngHashSetIdx

构造器详细资料

HashJoinStream

public HashJoinStream(TupleStream fullStream,
                      TupleStream hashStream,
                      List<String> hashOn)
               throws IOException

抛出:

IOException

HashJoinStream

public HashJoinStream(StreamExpression expression,
                      StreamFactory factory)
               throws IOException

抛出:

IOException

方法详细资料

toExpression

public StreamExpression toExpression(StreamFactory factory)
                              throws IOException

指定者:

toExpression 在接口中 Expressible

抛出:

IOException

toExplanation

public Explanation toExplanation(StreamFactory factory)
                          throws IOException

从接口复制的说明: Expressible

Returns an explanation about the stream object

指定者:

toExplanation 在接口中 Expressible

指定者:

toExplanation 在类中 TupleStream

参数:

factory - Stream factory for this, contains information about the function name

返回:

Explanation about this stream object containing explanations of any child stream objects

抛出:

IOException - throw on any error

setStreamContext

public void setStreamContext(StreamContext context)

指定者:

setStreamContext 在类中 TupleStream

children

public List<TupleStream> children()

指定者:

children 在类中 TupleStream

open

public void open()
          throws IOException

指定者:

open 在类中 TupleStream

抛出:

IOException

computeHash

protected String computeHash(Tuple tuple,
                             List<String> hashOn)

close

public void close()
           throws IOException

指定者:

close 在接口中 Closeable

指定者:

close 在接口中 AutoCloseable

指定者:

close 在类中 TupleStream

抛出:

IOException

read

public Tuple read()
           throws IOException

指定者:

read 在类中 TupleStream

抛出:

IOException

getStreamSort

public StreamComparator getStreamSort()

指定者:

getStreamSort 在类中 TupleStream

getCost

public int getCost()

覆盖:

getCost 在类中 TupleStream