org.apache.flink.streaming.api.datastream.temporal

Class StreamJoinOperator.JoinPredicate<I1,I2>

java.lang.Object

org.apache.flink.streaming.api.datastream.temporal.StreamJoinOperator.JoinPredicate<I1,I2>

Enclosing class:

StreamJoinOperator<I1,I2>

public static class StreamJoinOperator.JoinPredicate<I1,I2>
extends Object

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

Method Summary

Modifier and Type	Method and Description
StreamJoinOperator.JoinedStream<I1,I2>	equalTo(int... fields) Creates a temporal Join transformation and defines the Tuple fields of the second join DataStream that should be used as join keys.
<K> StreamJoinOperator.JoinedStream<I1,I2>	equalTo(org.apache.flink.api.java.functions.KeySelector<I2,K> keySelector) Creates a temporal Join transformation and defines a KeySelector function for the second join DataStream . The KeySelector function is called for each element of the second DataStream and extracts a single key value on which the DataStream is joined.
StreamJoinOperator.JoinedStream<I1,I2>	equalTo(String... fields) Creates a temporal Join transformation and defines the fields of the second join DataStream that should be used as join keys.

Methods inherited from class java.lang.Object

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

Method Detail

equalTo

public StreamJoinOperator.JoinedStream<I1,I2> equalTo(int... fields)

Creates a temporal Join transformation and defines the Tuple fields of the second join DataStream that should be used as join keys.

The resulting operator wraps each pair of joining elements in a Tuple2(first, second). To use a different wrapping function use StreamJoinOperator.JoinedStream.with(JoinFunction)

Parameters:

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

Returns:

A streaming join operator. Call StreamJoinOperator.JoinedStream.with(org.apache.flink.api.common.functions.JoinFunction<I1, I2, OUT>) to apply a custom wrapping

equalTo

public StreamJoinOperator.JoinedStream<I1,I2> equalTo(String... fields)

Creates a temporal Join transformation and defines the fields of the second join DataStream that should be used as join keys.

The resulting operator wraps each pair of joining elements in a Tuple2(first, second). To use a different wrapping function use StreamJoinOperator.JoinedStream.with(JoinFunction)

Parameters:

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

Returns:

A streaming join operator. Call StreamJoinOperator.JoinedStream.with(org.apache.flink.api.common.functions.JoinFunction<I1, I2, OUT>) to apply a custom wrapping

equalTo

public <K> StreamJoinOperator.JoinedStream<I1,I2> equalTo(org.apache.flink.api.java.functions.KeySelector<I2,K> keySelector)

Creates a temporal Join transformation and defines a KeySelector function for the second join DataStream .
The KeySelector function is called for each element of the second DataStream and extracts a single key value on which the DataStream is joined.

The resulting operator wraps each pair of joining elements in a Tuple2(first, second). To use a different wrapping function use StreamJoinOperator.JoinedStream.with(JoinFunction)

Parameters:

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

Returns:

A streaming join operator. Call StreamJoinOperator.JoinedStream.with(org.apache.flink.api.common.functions.JoinFunction<I1, I2, OUT>) to apply a custom wrapping