org.apache.flink.api.java.operators

Class JoinOperator.JoinOperatorSets.JoinOperatorSetsPredicate

java.lang.Object

org.apache.flink.api.java.operators.JoinOperator.JoinOperatorSets.JoinOperatorSetsPredicate

Enclosing class:

JoinOperator.JoinOperatorSets<I1,I2>

public class JoinOperator.JoinOperatorSets.JoinOperatorSetsPredicate
extends Object

Intermediate step of a Join transformation.
To continue the Join transformation, select the join key of the second input DataSet by calling equalTo(int...) or equalTo(KeySelector).

Method Summary

Modifier and Type	Method and Description
protected JoinOperator.DefaultJoin<I1,I2>	createJoinOperator(Keys<I2> keys2)
JoinOperator.DefaultJoin<I1,I2>	equalTo(int... fields) Continues a Join transformation and defines the Tuple fields of the second join DataSet that should be used as join keys. Note: Fields can only be selected as join keys on Tuple DataSets. The resulting JoinOperator.DefaultJoin wraps each pair of joining elements into a Tuple2, with the element of the first input being the first field of the tuple and the element of the second input being the second field of the tuple.
<K> JoinOperator.DefaultJoin<I1,I2>	equalTo(KeySelector<I2,K> keySelector) Continues a Join transformation and defines a KeySelector function for the second join DataSet. The KeySelector function is called for each element of the second DataSet and extracts a single key value on which the DataSet is joined.
JoinOperator.DefaultJoin<I1,I2>	equalTo(String... fields) Continues a Join transformation and defines the fields of the second join DataSet that should be used as join keys. The resulting JoinOperator.DefaultJoin wraps each pair of joining elements into a Tuple2, with the element of the first input being the first field of the tuple and the element of the second input being the second field of the tuple.

Methods inherited from class java.lang.Object

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

Method Detail

equalTo

public JoinOperator.DefaultJoin<I1,I2> equalTo(int... fields)

Continues a Join transformation and defines the Tuple fields of the second join DataSet that should be used as join keys.
Note: Fields can only be selected as join keys on Tuple DataSets.
The resulting JoinOperator.DefaultJoin wraps each pair of joining elements into a Tuple2, with the element of the first input being the first field of the tuple and the element of the second input being the second field of the tuple.

Parameters:

fields - The indexes of the Tuple fields of the second join DataSet that should be used as keys.

Returns:

A DefaultJoin that represents the joined DataSet.

equalTo

public JoinOperator.DefaultJoin<I1,I2> equalTo(String... fields)

Continues a Join transformation and defines the fields of the second join DataSet that should be used as join keys.
The resulting JoinOperator.DefaultJoin wraps each pair of joining elements into a Tuple2, with the element of the first input being the first field of the tuple and the element of the second input being the second field of the tuple.

Parameters:

fields - The fields of the second join DataSet that should be used as keys.

Returns:

A DefaultJoin that represents the joined DataSet.

equalTo

public <K> JoinOperator.DefaultJoin<I1,I2> equalTo(KeySelector<I2,K> keySelector)

Continues a Join transformation and defines a KeySelector function for the second join DataSet.
The KeySelector function is called for each element of the second DataSet and extracts a single key value on which the DataSet is joined.
The resulting JoinOperator.DefaultJoin wraps each pair of joining elements into a Tuple2, with the element of the first input being the first field of the tuple and the element of the second input being the second field of the tuple.

Parameters:

keySelector - The KeySelector function which extracts the key values from the second DataSet on which it is joined.

Returns:

A DefaultJoin that represents the joined DataSet.

createJoinOperator

protected JoinOperator.DefaultJoin<I1,I2> createJoinOperator(Keys<I2> keys2)