org.apache.flink.api.java.operators

Class CoGroupOperator.CoGroupOperatorSets<I1,I2>

java.lang.Object

org.apache.flink.api.java.operators.CoGroupOperator.CoGroupOperatorSets<I1,I2>

Type Parameters:

I1 - The type of the first input DataSet of the CoGroup transformation.

I2 - The type of the second input DataSet of the CoGroup transformation.

Enclosing class:

CoGroupOperator<I1,I2,OUT>

public static final class CoGroupOperator.CoGroupOperatorSets<I1,I2>
extends Object

Intermediate step of a CoGroup transformation.

To continue the CoGroup transformation, select the grouping key of the first input DataSet by calling where(int...) or where(KeySelector).

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
class	CoGroupOperator.CoGroupOperatorSets.CoGroupOperatorSetsPredicate Intermediate step of a CoGroup transformation.

Constructor Summary

Constructors

Constructor and Description
CoGroupOperatorSets(DataSet<I1> input1, DataSet<I2> input2)

Method Summary

Modifier and Type	Method and Description
CoGroupOperator.CoGroupOperatorSets.CoGroupOperatorSetsPredicate	where(int... fields) Continues a CoGroup transformation.
<K> CoGroupOperator.CoGroupOperatorSets.CoGroupOperatorSetsPredicate	where(org.apache.flink.api.java.functions.KeySelector<I1,K> keyExtractor) Continues a CoGroup transformation and defines a KeySelector function for the first co-grouped DataSet.
CoGroupOperator.CoGroupOperatorSets.CoGroupOperatorSetsPredicate	where(String... fields) Continues a CoGroup transformation.

Methods inherited from class java.lang.Object

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

Constructor Detail

CoGroupOperatorSets

public CoGroupOperatorSets(DataSet<I1> input1,
                           DataSet<I2> input2)

Method Detail

where

public CoGroupOperator.CoGroupOperatorSets.CoGroupOperatorSetsPredicate where(int... fields)

Continues a CoGroup transformation.

Defines the Tuple fields of the first co-grouped DataSet that should be used as grouping keys.

Note: Fields can only be selected as grouping keys on Tuple DataSets.

Parameters:

fields - The indexes of the Tuple fields of the first co-grouped DataSets that should be used as keys.

Returns:

An incomplete CoGroup transformation. Call CoGroupOperator.CoGroupOperatorSets.CoGroupOperatorSetsPredicate.equalTo(int...) to continue the CoGroup.

See Also:

Tuple, DataSet

where

public CoGroupOperator.CoGroupOperatorSets.CoGroupOperatorSetsPredicate where(String... fields)

Continues a CoGroup transformation.

Defines the fields of the first co-grouped DataSet that should be used as grouping keys. Fields are the names of member fields of the underlying type of the data set.

Parameters:

fields - The fields of the first co-grouped DataSets that should be used as keys.

Returns:

An incomplete CoGroup transformation. Call CoGroupOperator.CoGroupOperatorSets.CoGroupOperatorSetsPredicate.equalTo(int...) to continue the CoGroup.

See Also:

Tuple, DataSet

where

public <K> CoGroupOperator.CoGroupOperatorSets.CoGroupOperatorSetsPredicate where(org.apache.flink.api.java.functions.KeySelector<I1,K> keyExtractor)

Continues a CoGroup transformation and defines a KeySelector function for the first co-grouped DataSet.

The KeySelector function is called for each element of the first DataSet and extracts a single key value on which the DataSet is grouped.

Parameters:

keyExtractor - The KeySelector function which extracts the key values from the DataSet on which it is grouped.

Returns:

An incomplete CoGroup transformation. Call CoGroupOperator.CoGroupOperatorSets.CoGroupOperatorSetsPredicate.equalTo(int...) to continue the CoGroup.

See Also:

KeySelector, DataSet