Module org.apache.jena.arq

Package org.apache.jena.sparql.engine.join

Class QueryIterHashLeftJoin_Left

java.lang.Object

org.apache.jena.sparql.util.PrintSerializableBase

org.apache.jena.sparql.engine.iterator.QueryIteratorBase

org.apache.jena.sparql.engine.iterator.QueryIter

org.apache.jena.sparql.engine.iterator.QueryIter2

org.apache.jena.sparql.engine.join.AbstractIterHashJoin

org.apache.jena.sparql.engine.join.QueryIterHashLeftJoin_Left

All Implemented Interfaces:

Iterator<Binding>, org.apache.jena.atlas.io.Printable, org.apache.jena.atlas.iterator.IteratorCloseable<Binding>, org.apache.jena.atlas.lib.Closeable, QueryIterator, PrintSerializable

public class QueryIterHashLeftJoin_Left
extends AbstractIterHashJoin

Hash left join. This code materializes the left hand side into a probe table then hash joins from the right. See QueryIterHashLeftJoin_Right for one that uses the right hand side to make the probe table.

Method Summary

Modifier and Type	Method	Description
static QueryIterator	create(JoinKey joinKey, QueryIterator left, QueryIterator right, ExprList conditions, ExecutionContext execCxt)	Create a hashjoin QueryIterator.
static QueryIterator	create(QueryIterator left, QueryIterator right, ExprList conditions, ExecutionContext execCxt)	Create a hashjoin QueryIterator.

Methods inherited from class org.apache.jena.sparql.engine.iterator.QueryIter2

output

Methods inherited from class org.apache.jena.sparql.engine.iterator.QueryIter

close, flatMap, getExecContext, getIteratorNumber, makeTracked, map, materialize, materialize, output

Methods inherited from class org.apache.jena.sparql.engine.iterator.QueryIteratorBase

cancel, hasNext, next, nextBinding, remove

Methods inherited from class org.apache.jena.sparql.util.PrintSerializableBase

toString, toString

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Iterator

forEachRemaining

Methods inherited from interface org.apache.jena.sparql.util.PrintSerializable

toString

Methods inherited from interface org.apache.jena.sparql.engine.QueryIterator

isJoinIdentity

Method Details

create

public static QueryIterator create(JoinKey joinKey,
 QueryIterator left,
 QueryIterator right,
 ExprList conditions,
 ExecutionContext execCxt)

Create a hashjoin QueryIterator.

Parameters:

joinKey - Join key - if null, one is guessed by snooping the input QueryIterators

left -

right -

conditions -

execCxt -

Returns:

QueryIterator

create

public static QueryIterator create(QueryIterator left,
 QueryIterator right,
 ExprList conditions,
 ExecutionContext execCxt)

Create a hashjoin QueryIterator.

Parameters:

left -

right -

execCxt -

Returns:

QueryIterator